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",(0,r.yg)("a",{parentName:"h3",href:"/memlab/docs/api/interfaces/core_src.IHeapEdge"},(0,r.yg)("inlineCode",{parentName:"a"},"IHeapEdge")),") => ",(0,r.yg)("a",{parentName:"h3",href:"/memlab/docs/api/modules/core_src#optional"},(0,r.yg)("inlineCode",{parentName:"a"},"Optional")),"<{ ",(0,r.yg)("inlineCode",{parentName:"h3"},"stop"),": ",(0,r.yg)("inlineCode",{parentName:"h3"},"boolean")," }",">"," ","|"," ",(0,r.yg)("inlineCode",{parentName:"h3"},"void")),(0,r.yg)("p",null,"Executes a provided callback once for JavaScript references.\nFor concrete examples, check out ",(0,r.yg)("a",{parentName:"p",href:"/memlab/docs/api/interfaces/core_src.IHeapNode#foreachreference"},"forEachReference"),"\nor 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",(0,r.yg)("a",{parentName:"li",href:"/memlab/docs/api/modules/core_src#page"},(0,r.yg)("inlineCode",{parentName:"a"},"Page"))," | the puppeteer ",(0,r.yg)("a",{parentName:"li",href:"https://pptr.dev/api/puppeteer.page"},(0,r.yg)("inlineCode",{parentName:"a"},"Page"))," object, which provides APIs to interact with the web browser. To import this type, check out ",(0,r.yg)("a",{parentName:"li",href:"/memlab/docs/api/modules/core_src#page"},"Page"),"."),(0,r.yg)("li",{parentName:"ul"},(0,r.yg)("inlineCode",{parentName:"li"},"args?"),": ",(0,r.yg)("inlineCode",{parentName:"li"},"OperationArgs")))),(0,r.yg)("li",{parentName:"ul"},(0,r.yg)("p",{parentName:"li"},(0,r.yg)("strong",{parentName:"p"},"Returns"),": ",(0,r.yg)("inlineCode",{parentName:"p"},"Promise"),"<",(0,r.yg)("inlineCode",{parentName:"p"},"void"),">"," | no return value")),(0,r.yg)("li",{parentName:"ul"},(0,r.yg)("p",{parentName:"li"},(0,r.yg)("strong",{parentName:"p"},"Source"),":"),(0,r.yg)("ul",{parentName:"li"},(0,r.yg)("li",{parentName:"ul"},(0,r.yg)("a",{parentName:"li",href:"https://github.com/facebook/memlab/blob/c360a62/packages/core/src/lib/Types.ts#L640"},"core/src/lib/Types.ts:640"))))),(0,r.yg)("hr",null),(0,r.yg)("h3",{id:"-leakfiltercallback-node-iheapnode-snapshot-iheapsnapshot-leakednodeids-heapnodeidset--boolean"},(0,r.yg)("a",{id:"leakfiltercallback",name:"leakfiltercallback"})," ",(0,r.yg)("strong",{parentName:"h3"},"LeakFilterCallback"),": (",(0,r.yg)("inlineCode",{parentName:"h3"},"node"),": ",(0,r.yg)("a",{parentName:"h3",href:"/memlab/docs/api/interfaces/core_src.IHeapNode"},(0,r.yg)("inlineCode",{parentName:"a"},"IHeapNode")),", ",(0,r.yg)("inlineCode",{parentName:"h3"},"snapshot"),": ",(0,r.yg)("a",{parentName:"h3",href:"/memlab/docs/api/interfaces/core_src.IHeapSnapshot"},(0,r.yg)("inlineCode",{parentName:"a"},"IHeapSnapshot")),", ",(0,r.yg)("inlineCode",{parentName:"h3"},"leakedNodeIds"),": ",(0,r.yg)("inlineCode",{parentName:"h3"},"HeapNodeIdSet"),") => ",(0,r.yg)("inlineCode",{parentName:"h3"},"boolean")),(0,r.yg)("p",null,"Callback that can be used to define a logic to filter the\nleaked objects. The callback is only called for every node\nallocated but not released from the target interaction\nin the heap snapshot."),(0,r.yg)("p",null,"For concrete examples, check out ",(0,r.yg)("a",{parentName:"p",href:"/memlab/docs/api/interfaces/core_src.ILeakFilter#leakfilter"},"leakFilter"),"."),(0,r.yg)("ul",null,(0,r.yg)("li",{parentName:"ul"},(0,r.yg)("strong",{parentName:"li"},"Parameters"),":",(0,r.yg)("ul",{parentName:"li"},(0,r.yg)("li",{parentName:"ul"},(0,r.yg)("inlineCode",{parentName:"li"},"node"),": ",(0,r.yg)("a",{parentName:"li",href:"/memlab/docs/api/interfaces/core_src.IHeapNode"},(0,r.yg)("inlineCode",{parentName:"a"},"IHeapNode"))," | the node that is kept alive in the memory in the heap snapshot"),(0,r.yg)("li",{parentName:"ul"},(0,r.yg)("inlineCode",{parentName:"li"},"snapshot"),": ",(0,r.yg)("a",{parentName:"li",href:"/memlab/docs/api/interfaces/core_src.IHeapSnapshot"},(0,r.yg)("inlineCode",{parentName:"a"},"IHeapSnapshot"))," | the snapshot of target interaction"),(0,r.yg)("li",{parentName:"ul"},(0,r.yg)("inlineCode",{parentName:"li"},"leakedNodeIds"),": ",(0,r.yg)("inlineCode",{parentName:"li"},"HeapNodeIdSet")," | the set of leaked node ids"))),(0,r.yg)("li",{parentName:"ul"},(0,r.yg)("strong",{parentName:"li"},"Returns"),": ",(0,r.yg)("inlineCode",{parentName:"li"},"boolean")," | the value indicating whether the given node in the snapshot\nshould be considered as leaked."),(0,r.yg)("li",{parentName:"ul"},(0,r.yg)("strong",{parentName:"li"},"Examples"),":")),(0,r.yg)("pre",null,(0,r.yg)("code",{parentName:"pre",className:"language-javascript"},"// any node in the heap snapshot that is greater than 1MB\nfunction leakFilter(node, _snapshot, _leakedNodeIds) {\n return node.retainedSize > 1000000;\n};\n")),(0,r.yg)("ul",null,(0,r.yg)("li",{parentName:"ul"},(0,r.yg)("strong",{parentName:"li"},"Source"),":",(0,r.yg)("ul",{parentName:"li"},(0,r.yg)("li",{parentName:"ul"},(0,r.yg)("a",{parentName:"li",href:"https://github.com/facebook/memlab/blob/c360a62/packages/core/src/lib/Types.ts#L581"},"core/src/lib/Types.ts:581"))))),(0,r.yg)("hr",null),(0,r.yg)("h3",{id:"-nullablet-t--null"},(0,r.yg)("a",{id:"nullable",name:"nullable"})," ",(0,r.yg)("strong",{parentName:"h3"},"Nullable"),"<",(0,r.yg)("inlineCode",{parentName:"h3"},"T"),">",": ",(0,r.yg)("inlineCode",{parentName:"h3"},"T")," ","|"," ",(0,r.yg)("inlineCode",{parentName:"h3"},"null")),(0,r.yg)("p",null,"Given any type ",(0,r.yg)("inlineCode",{parentName:"p"},"T"),", return the union type ",(0,r.yg)("inlineCode",{parentName:"p"},"T")," and ",(0,r.yg)("inlineCode",{parentName:"p"},"null")),(0,r.yg)("h4",{id:"type-parameters"},"Type 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",(0,r.yg)("strong",{parentName:"h3"},"Optional"),"<",(0,r.yg)("inlineCode",{parentName:"h3"},"T"),">",": ",(0,r.yg)("inlineCode",{parentName:"h3"},"T")," ","|"," ",(0,r.yg)("inlineCode",{parentName:"h3"},"null")," ","|"," ",(0,r.yg)("inlineCode",{parentName:"h3"},"undefined")),(0,r.yg)("p",null,"Given any type ",(0,r.yg)("inlineCode",{parentName:"p"},"T"),", return the union type ",(0,r.yg)("inlineCode",{parentName:"p"},"T"),", ",(0,r.yg)("inlineCode",{parentName:"p"},"null"),", and ",(0,r.yg)("inlineCode",{parentName:"p"},"undefined"),"."),(0,r.yg)("h4",{id:"type-parameters-1"},"Type 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",(0,r.yg)("inlineCode",{parentName:"h3"},"PuppeteerPage")),(0,r.yg)("p",null,"This is the puppeteer ",(0,r.yg)("a",{parentName:"p",href:"https://pptr.dev/api/puppeteer.page"},(0,r.yg)("inlineCode",{parentName:"a"},"Page")),"\nclass used by MemLab. The puppeteer ",(0,r.yg)("inlineCode",{parentName:"p"},"Page")," class instance provides\nAPIs to interact with the web browser."),(0,r.yg)("p",null,"The puppeteer ",(0,r.yg)("inlineCode",{parentName:"p"},"Page")," type can be incompatible across different versions.\nYour local npm-installed puppeteer version may be different from\nthe puppeteer used by MemLab. 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",(0,r.yg)("inlineCode",{parentName:"h3"},"T"),") => ",(0,r.yg)("inlineCode",{parentName:"h3"},"boolean")),(0,r.yg)("h4",{id:"type-parameters-2"},"Type parameters"),(0,r.yg)("table",null,(0,r.yg)("thead",{parentName:"table"},(0,r.yg)("tr",{parentName:"thead"},(0,r.yg)("th",{parentName:"tr",align:"left"},"Name"),(0,r.yg)("th",{parentName:"tr",align:"left"},"Description"))),(0,r.yg)("tbody",{parentName:"table"},(0,r.yg)("tr",{parentName:"tbody"},(0,r.yg)("td",{parentName:"tr",align:"left"},(0,r.yg)("inlineCode",{parentName:"td"},"T")),(0,r.yg)("td",{parentName:"tr",align:"left"},"the type of the entity to be checked")))),(0,r.yg)("p",null,"the predicate callback is used to decide if a\nentity of type ",(0,r.yg)("inlineCode",{parentName:"p"},"T"),".\nFor more concrete examples on where it is used,\ncheck out ",(0,r.yg)("a",{parentName:"p",href:"/memlab/docs/api/interfaces/core_src.IHeapNode#findanyreference"},"findAnyReference"),", ",(0,r.yg)("a",{parentName:"p",href:"/memlab/docs/api/interfaces/core_src.IHeapNode#findanyreferrer"},"findAnyReferrer"),",\nand ",(0,r.yg)("a",{parentName:"p",href:"/memlab/docs/api/interfaces/core_src.IHeapNode#findreferrers"},"findReferrers"),"."),(0,r.yg)("ul",null,(0,r.yg)("li",{parentName:"ul"},(0,r.yg)("p",{parentName:"li"},(0,r.yg)("strong",{parentName:"p"},"Parameters"),":"),(0,r.yg)("ul",{parentName:"li"},(0,r.yg)("li",{parentName:"ul"},(0,r.yg)("inlineCode",{parentName:"li"},"entity"),": ",(0,r.yg)("inlineCode",{parentName:"li"},"T")," | the entity to be checked"))),(0,r.yg)("li",{parentName:"ul"},(0,r.yg)("p",{parentName:"li"},(0,r.yg)("strong",{parentName:"p"},"Returns"),": ",(0,r.yg)("inlineCode",{parentName:"p"},"boolean")," | whether the entity passes the predicate 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",(0,r.yg)("a",{parentName:"h3",href:"/memlab/docs/api/interfaces/core_src.IHeapSnapshot"},(0,r.yg)("inlineCode",{parentName:"a"},"IHeapSnapshot")),", ",(0,r.yg)("inlineCode",{parentName:"h3"},"isReferenceUsedByDefault"),": ",(0,r.yg)("inlineCode",{parentName:"h3"},"boolean"),") => ",(0,r.yg)("inlineCode",{parentName:"h3"},"boolean")),(0,r.yg)("p",null,"Callback that can be used to define a logic to decide whether\na reference should be filtered (included) for some\ncalculations (e.g., retainer trace calculation)"),(0,r.yg)("p",null,"For concrete examples, check out ",(0,r.yg)("a",{parentName:"p",href:"/memlab/docs/api/interfaces/core_src.ILeakFilter#leakfilter"},"leakFilter"),"."),(0,r.yg)("ul",null,(0,r.yg)("li",{parentName:"ul"},(0,r.yg)("strong",{parentName:"li"},"Parameters"),":",(0,r.yg)("ul",{parentName:"li"},(0,r.yg)("li",{parentName:"ul"},(0,r.yg)("inlineCode",{parentName:"li"},"edge"),": 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",(0,r.yg)("inlineCode",{parentName:"li"},"boolean")," | the value indicating whether the given reference should be\nfiltered (i.e., included)")),(0,r.yg)("p",null,"Please also be aware that some edges like self-referencing edges,\nJS engine's internal edges, and hidden edges should not be considered\nas part of the retainer trace. 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",(0,r.yg)("inlineCode",{parentName:"p"},"isReferenceUsedByDefault")," will\nbe ",(0,r.yg)("inlineCode",{parentName:"p"},"false")," for these types of edges."),(0,r.yg)("ul",null,(0,r.yg)("li",{parentName:"ul"},(0,r.yg)("strong",{parentName:"li"},"Examples"),":")),(0,r.yg)("pre",null,(0,r.yg)("code",{parentName:"pre",className:"language-javascript"},"// exclude react fiber references\nfunction retainerReferenceFilter(edge, _snapshot, _isReferenceUsedByDefault) {\n if (edge.name_or_index.toString().startsWith('__reactFiber$')) {\n return false;\n }\n // exclude other references here\n // ...\n return true;\n};\n")),(0,r.yg)("ul",null,(0,r.yg)("li",{parentName:"ul"},(0,r.yg)("strong",{parentName:"li"},"Source"),":",(0,r.yg)("ul",{parentName:"li"},(0,r.yg)("li",{parentName:"ul"},(0,r.yg)("a",{parentName:"li",href:"https://github.com/facebook/memlab/blob/c360a62/packages/core/src/lib/Types.ts#L624"},"core/src/lib/Types.ts:624"))))),(0,r.yg)("hr",null),(0,r.yg)("h3",{id:"-runmetainfo-object"},(0,r.yg)("a",{id:"runmetainfo",name:"runmetainfo"})," ",(0,r.yg)("strong",{parentName:"h3"},"RunMetaInfo"),": ",(0,r.yg)("inlineCode",{parentName:"h3"},"Object")),(0,r.yg)("p",null,"This data structure holds the information about memlab run.\nYou can retrieve the instance of this type through 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any type ",(0,r.yg)("inlineCode",{parentName:"p"},"T"),", return the union type ",(0,r.yg)("inlineCode",{parentName:"p"},"T")," and ",(0,r.yg)("inlineCode",{parentName:"p"},"undefined"),"."),(0,r.yg)("h4",{id:"type-parameters-3"},"Type parameters"),(0,r.yg)("table",null,(0,r.yg)("thead",{parentName:"table"},(0,r.yg)("tr",{parentName:"thead"},(0,r.yg)("th",{parentName:"tr",align:"left"},"Name"),(0,r.yg)("th",{parentName:"tr",align:"left"},"Description"))),(0,r.yg)("tbody",{parentName:"table"},(0,r.yg)("tr",{parentName:"tbody"},(0,r.yg)("td",{parentName:"tr",align:"left"},(0,r.yg)("inlineCode",{parentName:"td"},"T")),(0,r.yg)("td",{parentName:"tr",align:"left"},"The type that will be made 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attacks.")),(0,r.yg)("tr",{parentName:"tbody"},(0,r.yg)("td",{parentName:"tr",align:"left"},(0,r.yg)("inlineCode",{parentName:"td"},"secure?")),(0,r.yg)("td",{parentName:"tr",align:"left"},(0,r.yg)("a",{parentName:"td",href:"/memlab/docs/api/modules/core_src#undefinable"},(0,r.yg)("inlineCode",{parentName:"a"},"Undefinable")),"<",(0,r.yg)("inlineCode",{parentName:"td"},"boolean"),">"),(0,r.yg)("td",{parentName:"tr",align:"left"},"Optional: Flag to indicate if the cookie transmission requires a secure protocol (e.g., HTTPS)")),(0,r.yg)("tr",{parentName:"tbody"},(0,r.yg)("td",{parentName:"tr",align:"left"},(0,r.yg)("inlineCode",{parentName:"td"},"session?")),(0,r.yg)("td",{parentName:"tr",align:"left"},(0,r.yg)("a",{parentName:"td",href:"/memlab/docs/api/modules/core_src#undefinable"},(0,r.yg)("inlineCode",{parentName:"a"},"Undefinable")),"<",(0,r.yg)("inlineCode",{parentName:"td"},"boolean"),">"),(0,r.yg)("td",{parentName:"tr",align:"left"},"Optional: Flag to check if the cookie is a session cookie")),(0,r.yg)("tr",{parentName:"tbody"},(0,r.yg)("td",{parentName:"tr",align:"left"},(0,r.yg)("inlineCode",{parentName:"td"},"url?")),(0,r.yg)("td",{parentName:"tr",align:"left"},(0,r.yg)("a",{parentName:"td",href:"/memlab/docs/api/modules/core_src#undefinable"},(0,r.yg)("inlineCode",{parentName:"a"},"Undefinable")),"<",(0,r.yg)("inlineCode",{parentName:"td"},"string"),">"),(0,r.yg)("td",{parentName:"tr",align:"left"},"Optional: Specifies the request-URI linked with the cookie setup. This can influence the cookie's default domain and path")),(0,r.yg)("tr",{parentName:"tbody"},(0,r.yg)("td",{parentName:"tr",align:"left"},(0,r.yg)("inlineCode",{parentName:"td"},"value")),(0,r.yg)("td",{parentName:"tr",align:"left"},(0,r.yg)("inlineCode",{parentName:"td"},"string")),(0,r.yg)("td",{parentName:"tr",align:"left"},"Mandatory: Represents the value assigned to the cookie")))),(0,r.yg)("ul",null,(0,r.yg)("li",{parentName:"ul"},(0,r.yg)("strong",{parentName:"li"},"Source"),":",(0,r.yg)("ul",{parentName:"li"},(0,r.yg)("li",{parentName:"ul"},(0,r.yg)("a",{parentName:"li",href:"https://github.com/facebook/memlab/blob/eebc764/packages/core/src/lib/Types.ts#L236"},"core/src/lib/Types.ts:236"))))),(0,r.yg)("hr",null),(0,r.yg)("h3",{id:"-cookies-cookie"},(0,r.yg)("a",{id:"cookies",name:"cookies"})," ",(0,r.yg)("strong",{parentName:"h3"},"Cookies"),": ",(0,r.yg)("a",{parentName:"h3",href:"/memlab/docs/api/modules/core_src#cookie"},(0,r.yg)("inlineCode",{parentName:"a"},"Cookie")),"[]"),(0,r.yg)("p",null,"Data structure for holding cookies.\nFor concrete use case, please check out ",(0,r.yg)("a",{parentName:"p",href:"/memlab/docs/api/interfaces/core_src.IScenario#cookies"},"cookies"),"."),(0,r.yg)("ul",null,(0,r.yg)("li",{parentName:"ul"},(0,r.yg)("strong",{parentName:"li"},"Source"),":",(0,r.yg)("ul",{parentName:"li"},(0,r.yg)("li",{parentName:"ul"},(0,r.yg)("a",{parentName:"li",href:"https://github.com/facebook/memlab/blob/eebc764/packages/core/src/lib/Types.ts#L226"},"core/src/lib/Types.ts:226"))))),(0,r.yg)("hr",null),(0,r.yg)("h3",{id:"-edgeiterationcallback-edge-iheapedge--optional-stop-boolean----void"},(0,r.yg)("a",{id:"edgeiterationcallback",name:"edgeiterationcallback"})," ",(0,r.yg)("strong",{parentName:"h3"},"EdgeIterationCallback"),": (",(0,r.yg)("inlineCode",{parentName:"h3"},"edge"),": ",(0,r.yg)("a",{parentName:"h3",href:"/memlab/docs/api/interfaces/core_src.IHeapEdge"},(0,r.yg)("inlineCode",{parentName:"a"},"IHeapEdge")),") => ",(0,r.yg)("a",{parentName:"h3",href:"/memlab/docs/api/modules/core_src#optional"},(0,r.yg)("inlineCode",{parentName:"a"},"Optional")),"<{ ",(0,r.yg)("inlineCode",{parentName:"h3"},"stop"),": ",(0,r.yg)("inlineCode",{parentName:"h3"},"boolean")," }",">"," ","|"," ",(0,r.yg)("inlineCode",{parentName:"h3"},"void")),(0,r.yg)("p",null,"Executes a provided callback once for JavaScript references.\nFor concrete examples, check out ",(0,r.yg)("a",{parentName:"p",href:"/memlab/docs/api/interfaces/core_src.IHeapNode#foreachreference"},"forEachReference"),"\nor ",(0,r.yg)("a",{parentName:"p",href:"/memlab/docs/api/interfaces/core_src.IHeapNode#foreachreferrer"},"forEachReferrer"),"."),(0,r.yg)("ul",null,(0,r.yg)("li",{parentName:"ul"},(0,r.yg)("p",{parentName:"li"},(0,r.yg)("strong",{parentName:"p"},"Parameters"),":"),(0,r.yg)("ul",{parentName:"li"},(0,r.yg)("li",{parentName:"ul"},(0,r.yg)("inlineCode",{parentName:"li"},"edge"),": ",(0,r.yg)("a",{parentName:"li",href:"/memlab/docs/api/interfaces/core_src.IHeapEdge"},(0,r.yg)("inlineCode",{parentName:"a"},"IHeapEdge"))))),(0,r.yg)("li",{parentName:"ul"},(0,r.yg)("p",{parentName:"li"},(0,r.yg)("strong",{parentName:"p"},"Returns"),": ",(0,r.yg)("a",{parentName:"p",href:"/memlab/docs/api/modules/core_src#optional"},(0,r.yg)("inlineCode",{parentName:"a"},"Optional")),"<{ ",(0,r.yg)("inlineCode",{parentName:"p"},"stop"),": ",(0,r.yg)("inlineCode",{parentName:"p"},"boolean")," }",">"," ","|"," ",(0,r.yg)("inlineCode",{parentName:"p"},"void")," | this API returns void")),(0,r.yg)("li",{parentName:"ul"},(0,r.yg)("p",{parentName:"li"},(0,r.yg)("strong",{parentName:"p"},"Source"),":"),(0,r.yg)("ul",{parentName:"li"},(0,r.yg)("li",{parentName:"ul"},(0,r.yg)("a",{parentName:"li",href:"https://github.com/facebook/memlab/blob/eebc764/packages/core/src/lib/Types.ts#L1779"},"core/src/lib/Types.ts:1779"))))),(0,r.yg)("hr",null),(0,r.yg)("h3",{id:"-initleakfiltercallback-snapshot-iheapsnapshot-leakednodeids-heapnodeidset--void"},(0,r.yg)("a",{id:"initleakfiltercallback",name:"initleakfiltercallback"})," ",(0,r.yg)("strong",{parentName:"h3"},"InitLeakFilterCallback"),": (",(0,r.yg)("inlineCode",{parentName:"h3"},"snapshot"),": ",(0,r.yg)("a",{parentName:"h3",href:"/memlab/docs/api/interfaces/core_src.IHeapSnapshot"},(0,r.yg)("inlineCode",{parentName:"a"},"IHeapSnapshot")),", ",(0,r.yg)("inlineCode",{parentName:"h3"},"leakedNodeIds"),": ",(0,r.yg)("inlineCode",{parentName:"h3"},"HeapNodeIdSet"),") => ",(0,r.yg)("inlineCode",{parentName:"h3"},"void")),(0,r.yg)("p",null,"Lifecycle function callback that is invoked initially once before calling any\nleak filter function.\nFor concrete example, check out ",(0,r.yg)("a",{parentName:"p",href:"/memlab/docs/api/interfaces/core_src.ILeakFilter#beforeleakfilter"},"beforeLeakFilter"),"."),(0,r.yg)("ul",null,(0,r.yg)("li",{parentName:"ul"},(0,r.yg)("p",{parentName:"li"},(0,r.yg)("strong",{parentName:"p"},"Parameters"),":"),(0,r.yg)("ul",{parentName:"li"},(0,r.yg)("li",{parentName:"ul"},(0,r.yg)("inlineCode",{parentName:"li"},"snapshot"),": ",(0,r.yg)("a",{parentName:"li",href:"/memlab/docs/api/interfaces/core_src.IHeapSnapshot"},(0,r.yg)("inlineCode",{parentName:"a"},"IHeapSnapshot"))," | heap snapshot see ",(0,r.yg)("a",{parentName:"li",href:"/memlab/docs/api/interfaces/core_src.IHeapSnapshot"},"IHeapSnapshot")),(0,r.yg)("li",{parentName:"ul"},(0,r.yg)("inlineCode",{parentName:"li"},"leakedNodeIds"),": ",(0,r.yg)("inlineCode",{parentName:"li"},"HeapNodeIdSet")," | the set of leaked object (node) ids."))),(0,r.yg)("li",{parentName:"ul"},(0,r.yg)("p",{parentName:"li"},(0,r.yg)("strong",{parentName:"p"},"Returns"),": ",(0,r.yg)("inlineCode",{parentName:"p"},"void"))),(0,r.yg)("li",{parentName:"ul"},(0,r.yg)("p",{parentName:"li"},(0,r.yg)("strong",{parentName:"p"},"Source"),":"),(0,r.yg)("ul",{parentName:"li"},(0,r.yg)("li",{parentName:"ul"},(0,r.yg)("a",{parentName:"li",href:"https://github.com/facebook/memlab/blob/eebc764/packages/core/src/lib/Types.ts#L554"},"core/src/lib/Types.ts:554"))))),(0,r.yg)("hr",null),(0,r.yg)("h3",{id:"-interactionscallback-page-page-args-operationargs--promisevoid"},(0,r.yg)("a",{id:"interactionscallback",name:"interactionscallback"})," ",(0,r.yg)("strong",{parentName:"h3"},"InteractionsCallback"),": (",(0,r.yg)("inlineCode",{parentName:"h3"},"page"),": ",(0,r.yg)("a",{parentName:"h3",href:"/memlab/docs/api/modules/core_src#page"},(0,r.yg)("inlineCode",{parentName:"a"},"Page")),", ",(0,r.yg)("inlineCode",{parentName:"h3"},"args?"),": ",(0,r.yg)("inlineCode",{parentName:"h3"},"OperationArgs"),") => ",(0,r.yg)("inlineCode",{parentName:"h3"},"Promise"),"<",(0,r.yg)("inlineCode",{parentName:"h3"},"void"),">"),(0,r.yg)("p",null,"The callback defines browser interactions which are\nused by memlab to interact with the web app under test.\nFor concrete examples, check out ",(0,r.yg)("a",{parentName:"p",href:"/memlab/docs/api/interfaces/core_src.IScenario#action"},"action")," or ",(0,r.yg)("a",{parentName:"p",href:"/memlab/docs/api/interfaces/core_src.IScenario#back"},"back"),"."),(0,r.yg)("ul",null,(0,r.yg)("li",{parentName:"ul"},(0,r.yg)("p",{parentName:"li"},(0,r.yg)("strong",{parentName:"p"},"Parameters"),":"),(0,r.yg)("ul",{parentName:"li"},(0,r.yg)("li",{parentName:"ul"},(0,r.yg)("inlineCode",{parentName:"li"},"page"),": ",(0,r.yg)("a",{parentName:"li",href:"/memlab/docs/api/modules/core_src#page"},(0,r.yg)("inlineCode",{parentName:"a"},"Page"))," | the puppeteer ",(0,r.yg)("a",{parentName:"li",href:"https://pptr.dev/api/puppeteer.page"},(0,r.yg)("inlineCode",{parentName:"a"},"Page"))," object, which provides APIs to interact with the web browser. To import this type, check out ",(0,r.yg)("a",{parentName:"li",href:"/memlab/docs/api/modules/core_src#page"},"Page"),"."),(0,r.yg)("li",{parentName:"ul"},(0,r.yg)("inlineCode",{parentName:"li"},"args?"),": ",(0,r.yg)("inlineCode",{parentName:"li"},"OperationArgs")))),(0,r.yg)("li",{parentName:"ul"},(0,r.yg)("p",{parentName:"li"},(0,r.yg)("strong",{parentName:"p"},"Returns"),": ",(0,r.yg)("inlineCode",{parentName:"p"},"Promise"),"<",(0,r.yg)("inlineCode",{parentName:"p"},"void"),">"," | no return value")),(0,r.yg)("li",{parentName:"ul"},(0,r.yg)("p",{parentName:"li"},(0,r.yg)("strong",{parentName:"p"},"Source"),":"),(0,r.yg)("ul",{parentName:"li"},(0,r.yg)("li",{parentName:"ul"},(0,r.yg)("a",{parentName:"li",href:"https://github.com/facebook/memlab/blob/eebc764/packages/core/src/lib/Types.ts#L640"},"core/src/lib/Types.ts:640"))))),(0,r.yg)("hr",null),(0,r.yg)("h3",{id:"-leakfiltercallback-node-iheapnode-snapshot-iheapsnapshot-leakednodeids-heapnodeidset--boolean"},(0,r.yg)("a",{id:"leakfiltercallback",name:"leakfiltercallback"})," ",(0,r.yg)("strong",{parentName:"h3"},"LeakFilterCallback"),": (",(0,r.yg)("inlineCode",{parentName:"h3"},"node"),": ",(0,r.yg)("a",{parentName:"h3",href:"/memlab/docs/api/interfaces/core_src.IHeapNode"},(0,r.yg)("inlineCode",{parentName:"a"},"IHeapNode")),", ",(0,r.yg)("inlineCode",{parentName:"h3"},"snapshot"),": ",(0,r.yg)("a",{parentName:"h3",href:"/memlab/docs/api/interfaces/core_src.IHeapSnapshot"},(0,r.yg)("inlineCode",{parentName:"a"},"IHeapSnapshot")),", ",(0,r.yg)("inlineCode",{parentName:"h3"},"leakedNodeIds"),": ",(0,r.yg)("inlineCode",{parentName:"h3"},"HeapNodeIdSet"),") => ",(0,r.yg)("inlineCode",{parentName:"h3"},"boolean")),(0,r.yg)("p",null,"Callback that can be used to define a logic to filter the\nleaked objects. The callback is only called for every node\nallocated but not released from the target interaction\nin the heap snapshot."),(0,r.yg)("p",null,"For concrete examples, check out ",(0,r.yg)("a",{parentName:"p",href:"/memlab/docs/api/interfaces/core_src.ILeakFilter#leakfilter"},"leakFilter"),"."),(0,r.yg)("ul",null,(0,r.yg)("li",{parentName:"ul"},(0,r.yg)("strong",{parentName:"li"},"Parameters"),":",(0,r.yg)("ul",{parentName:"li"},(0,r.yg)("li",{parentName:"ul"},(0,r.yg)("inlineCode",{parentName:"li"},"node"),": ",(0,r.yg)("a",{parentName:"li",href:"/memlab/docs/api/interfaces/core_src.IHeapNode"},(0,r.yg)("inlineCode",{parentName:"a"},"IHeapNode"))," | the node that is kept alive in the memory in the heap snapshot"),(0,r.yg)("li",{parentName:"ul"},(0,r.yg)("inlineCode",{parentName:"li"},"snapshot"),": ",(0,r.yg)("a",{parentName:"li",href:"/memlab/docs/api/interfaces/core_src.IHeapSnapshot"},(0,r.yg)("inlineCode",{parentName:"a"},"IHeapSnapshot"))," | the snapshot of target interaction"),(0,r.yg)("li",{parentName:"ul"},(0,r.yg)("inlineCode",{parentName:"li"},"leakedNodeIds"),": ",(0,r.yg)("inlineCode",{parentName:"li"},"HeapNodeIdSet")," | the set of leaked node ids"))),(0,r.yg)("li",{parentName:"ul"},(0,r.yg)("strong",{parentName:"li"},"Returns"),": ",(0,r.yg)("inlineCode",{parentName:"li"},"boolean")," | the value indicating whether the given node in the snapshot\nshould be considered as leaked."),(0,r.yg)("li",{parentName:"ul"},(0,r.yg)("strong",{parentName:"li"},"Examples"),":")),(0,r.yg)("pre",null,(0,r.yg)("code",{parentName:"pre",className:"language-javascript"},"// any node in the heap snapshot that is greater than 1MB\nfunction leakFilter(node, _snapshot, _leakedNodeIds) {\n return node.retainedSize > 1000000;\n};\n")),(0,r.yg)("ul",null,(0,r.yg)("li",{parentName:"ul"},(0,r.yg)("strong",{parentName:"li"},"Source"),":",(0,r.yg)("ul",{parentName:"li"},(0,r.yg)("li",{parentName:"ul"},(0,r.yg)("a",{parentName:"li",href:"https://github.com/facebook/memlab/blob/eebc764/packages/core/src/lib/Types.ts#L581"},"core/src/lib/Types.ts:581"))))),(0,r.yg)("hr",null),(0,r.yg)("h3",{id:"-nullablet-t--null"},(0,r.yg)("a",{id:"nullable",name:"nullable"})," ",(0,r.yg)("strong",{parentName:"h3"},"Nullable"),"<",(0,r.yg)("inlineCode",{parentName:"h3"},"T"),">",": ",(0,r.yg)("inlineCode",{parentName:"h3"},"T")," ","|"," ",(0,r.yg)("inlineCode",{parentName:"h3"},"null")),(0,r.yg)("p",null,"Given any type ",(0,r.yg)("inlineCode",{parentName:"p"},"T"),", return the union type ",(0,r.yg)("inlineCode",{parentName:"p"},"T")," and ",(0,r.yg)("inlineCode",{parentName:"p"},"null")),(0,r.yg)("h4",{id:"type-parameters"},"Type 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",(0,r.yg)("strong",{parentName:"h3"},"Optional"),"<",(0,r.yg)("inlineCode",{parentName:"h3"},"T"),">",": ",(0,r.yg)("inlineCode",{parentName:"h3"},"T")," ","|"," ",(0,r.yg)("inlineCode",{parentName:"h3"},"null")," ","|"," ",(0,r.yg)("inlineCode",{parentName:"h3"},"undefined")),(0,r.yg)("p",null,"Given any type ",(0,r.yg)("inlineCode",{parentName:"p"},"T"),", return the union type ",(0,r.yg)("inlineCode",{parentName:"p"},"T"),", ",(0,r.yg)("inlineCode",{parentName:"p"},"null"),", and ",(0,r.yg)("inlineCode",{parentName:"p"},"undefined"),"."),(0,r.yg)("h4",{id:"type-parameters-1"},"Type 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",(0,r.yg)("inlineCode",{parentName:"h3"},"PuppeteerPage")),(0,r.yg)("p",null,"This is the puppeteer ",(0,r.yg)("a",{parentName:"p",href:"https://pptr.dev/api/puppeteer.page"},(0,r.yg)("inlineCode",{parentName:"a"},"Page")),"\nclass used by MemLab. The puppeteer ",(0,r.yg)("inlineCode",{parentName:"p"},"Page")," class instance provides\nAPIs to interact with the web browser."),(0,r.yg)("p",null,"The puppeteer ",(0,r.yg)("inlineCode",{parentName:"p"},"Page")," type can be incompatible across different versions.\nYour local npm-installed puppeteer version may be different from\nthe puppeteer used by MemLab. This may cause some type errors, for example:"),(0,r.yg)("pre",null,(0,r.yg)("code",{parentName:"pre",className:"language-typescript"},"import type {Page} from 'puppeteer';\nimport type {RunOptions} from '@memlab/api';\n\nconst runOptions: RunOptions = {\n scenario: {\n // initial page load url: Google Maps\n url: () => {\n return \"https://www.google.com/maps/@37.386427,-122.0428214,11z\";\n },\n // type error here if your local puppeeter version is different\n // from the puppeteer used by MemLab\n action: async function (page: Page) {\n await page.click('button[aria-label=\"Hotels\"]');\n },\n },\n};\n")),(0,r.yg)("p",null,"To avoid the type error in the code example above, MemLab exports the\npuppeteer ",(0,r.yg)("inlineCode",{parentName:"p"},"Page")," type used by MemLab so that your code can import it\nwhen necessary:"),(0,r.yg)("pre",null,(0,r.yg)("code",{parentName:"pre",className:"language-typescript"},"import type {Page} from '@memlab/core' // import Page type from memlab\nimport type {RunOptions} from 'memlab';\n\nconst runOptions: RunOptions = {\n scenario: {\n // initial page load url: Google Maps\n url: () => {\n return \"https://www.google.com/maps/@37.386427,-122.0428214,11z\";\n },\n // no type error here\n action: async function (page: Page) {\n await page.click('button[aria-label=\"Hotels\"]');\n },\n },\n};\n")),(0,r.yg)("ul",null,(0,r.yg)("li",{parentName:"ul"},(0,r.yg)("strong",{parentName:"li"},"Source"),":",(0,r.yg)("ul",{parentName:"li"},(0,r.yg)("li",{parentName:"ul"},(0,r.yg)("a",{parentName:"li",href:"https://github.com/facebook/memlab/blob/eebc764/packages/core/src/lib/Types.ts#L207"},"core/src/lib/Types.ts:207"))))),(0,r.yg)("hr",null),(0,r.yg)("h3",{id:"-predicatort-entity-t--boolean"},(0,r.yg)("a",{id:"predicator",name:"predicator"})," ",(0,r.yg)("strong",{parentName:"h3"},"Predicator"),"<",(0,r.yg)("inlineCode",{parentName:"h3"},"T"),">",": (",(0,r.yg)("inlineCode",{parentName:"h3"},"entity"),": ",(0,r.yg)("inlineCode",{parentName:"h3"},"T"),") => ",(0,r.yg)("inlineCode",{parentName:"h3"},"boolean")),(0,r.yg)("h4",{id:"type-parameters-2"},"Type parameters"),(0,r.yg)("table",null,(0,r.yg)("thead",{parentName:"table"},(0,r.yg)("tr",{parentName:"thead"},(0,r.yg)("th",{parentName:"tr",align:"left"},"Name"),(0,r.yg)("th",{parentName:"tr",align:"left"},"Description"))),(0,r.yg)("tbody",{parentName:"table"},(0,r.yg)("tr",{parentName:"tbody"},(0,r.yg)("td",{parentName:"tr",align:"left"},(0,r.yg)("inlineCode",{parentName:"td"},"T")),(0,r.yg)("td",{parentName:"tr",align:"left"},"the type of the entity to be checked")))),(0,r.yg)("p",null,"the predicate callback is used to decide if a\nentity of type ",(0,r.yg)("inlineCode",{parentName:"p"},"T"),".\nFor more concrete examples on where it is used,\ncheck out ",(0,r.yg)("a",{parentName:"p",href:"/memlab/docs/api/interfaces/core_src.IHeapNode#findanyreference"},"findAnyReference"),", ",(0,r.yg)("a",{parentName:"p",href:"/memlab/docs/api/interfaces/core_src.IHeapNode#findanyreferrer"},"findAnyReferrer"),",\nand ",(0,r.yg)("a",{parentName:"p",href:"/memlab/docs/api/interfaces/core_src.IHeapNode#findreferrers"},"findReferrers"),"."),(0,r.yg)("ul",null,(0,r.yg)("li",{parentName:"ul"},(0,r.yg)("p",{parentName:"li"},(0,r.yg)("strong",{parentName:"p"},"Parameters"),":"),(0,r.yg)("ul",{parentName:"li"},(0,r.yg)("li",{parentName:"ul"},(0,r.yg)("inlineCode",{parentName:"li"},"entity"),": ",(0,r.yg)("inlineCode",{parentName:"li"},"T")," | the entity to be checked"))),(0,r.yg)("li",{parentName:"ul"},(0,r.yg)("p",{parentName:"li"},(0,r.yg)("strong",{parentName:"p"},"Returns"),": ",(0,r.yg)("inlineCode",{parentName:"p"},"boolean")," | whether the entity passes the predicate check")),(0,r.yg)("li",{parentName:"ul"},(0,r.yg)("p",{parentName:"li"},(0,r.yg)("strong",{parentName:"p"},"Source"),":"),(0,r.yg)("ul",{parentName:"li"},(0,r.yg)("li",{parentName:"ul"},(0,r.yg)("a",{parentName:"li",href:"https://github.com/facebook/memlab/blob/eebc764/packages/core/src/lib/Types.ts#L220"},"core/src/lib/Types.ts:220"))))),(0,r.yg)("hr",null),(0,r.yg)("h3",{id:"-referencefiltercallback-edge-iheapedge-snapshot-iheapsnapshot-isreferenceusedbydefault-boolean--boolean"},(0,r.yg)("a",{id:"referencefiltercallback",name:"referencefiltercallback"})," ",(0,r.yg)("strong",{parentName:"h3"},"ReferenceFilterCallback"),": (",(0,r.yg)("inlineCode",{parentName:"h3"},"edge"),": ",(0,r.yg)("a",{parentName:"h3",href:"/memlab/docs/api/interfaces/core_src.IHeapEdge"},(0,r.yg)("inlineCode",{parentName:"a"},"IHeapEdge")),", ",(0,r.yg)("inlineCode",{parentName:"h3"},"snapshot"),": ",(0,r.yg)("a",{parentName:"h3",href:"/memlab/docs/api/interfaces/core_src.IHeapSnapshot"},(0,r.yg)("inlineCode",{parentName:"a"},"IHeapSnapshot")),", ",(0,r.yg)("inlineCode",{parentName:"h3"},"isReferenceUsedByDefault"),": ",(0,r.yg)("inlineCode",{parentName:"h3"},"boolean"),") => ",(0,r.yg)("inlineCode",{parentName:"h3"},"boolean")),(0,r.yg)("p",null,"Callback that can be used to define a logic to decide whether\na reference should be filtered (included) for some\ncalculations (e.g., retainer trace calculation)"),(0,r.yg)("p",null,"For concrete examples, check out ",(0,r.yg)("a",{parentName:"p",href:"/memlab/docs/api/interfaces/core_src.ILeakFilter#leakfilter"},"leakFilter"),"."),(0,r.yg)("ul",null,(0,r.yg)("li",{parentName:"ul"},(0,r.yg)("strong",{parentName:"li"},"Parameters"),":",(0,r.yg)("ul",{parentName:"li"},(0,r.yg)("li",{parentName:"ul"},(0,r.yg)("inlineCode",{parentName:"li"},"edge"),": ",(0,r.yg)("a",{parentName:"li",href:"/memlab/docs/api/interfaces/core_src.IHeapEdge"},(0,r.yg)("inlineCode",{parentName:"a"},"IHeapEdge"))," | the reference (edge) that is considered for calcualting the retainer trace"),(0,r.yg)("li",{parentName:"ul"},(0,r.yg)("inlineCode",{parentName:"li"},"snapshot"),": ",(0,r.yg)("a",{parentName:"li",href:"/memlab/docs/api/interfaces/core_src.IHeapSnapshot"},(0,r.yg)("inlineCode",{parentName:"a"},"IHeapSnapshot"))," | the final snapshot taken after all browser interactions are done."),(0,r.yg)("li",{parentName:"ul"},(0,r.yg)("inlineCode",{parentName:"li"},"isReferenceUsedByDefault"),": ",(0,r.yg)("inlineCode",{parentName:"li"},"boolean")," | MemLab has its own default logic for whether a reference should be filtered (included), if this parameter is true, it means MemLab will consider this reference for inclusion"))),(0,r.yg)("li",{parentName:"ul"},(0,r.yg)("strong",{parentName:"li"},"Returns"),": ",(0,r.yg)("inlineCode",{parentName:"li"},"boolean")," | the value indicating whether the given reference should be\nfiltered (i.e., included)")),(0,r.yg)("p",null,"Please also be aware that some edges like self-referencing edges,\nJS engine's internal edges, and hidden edges should not be considered\nas part of the retainer trace. These edges could make the retainer trace\nunncessarily complex and cause confusion. ",(0,r.yg)("inlineCode",{parentName:"p"},"isReferenceUsedByDefault")," will\nbe ",(0,r.yg)("inlineCode",{parentName:"p"},"false")," for these types of edges."),(0,r.yg)("ul",null,(0,r.yg)("li",{parentName:"ul"},(0,r.yg)("strong",{parentName:"li"},"Examples"),":")),(0,r.yg)("pre",null,(0,r.yg)("code",{parentName:"pre",className:"language-javascript"},"// exclude react fiber references\nfunction retainerReferenceFilter(edge, _snapshot, _isReferenceUsedByDefault) {\n if (edge.name_or_index.toString().startsWith('__reactFiber$')) {\n return false;\n }\n // exclude other references here\n // ...\n return true;\n};\n")),(0,r.yg)("ul",null,(0,r.yg)("li",{parentName:"ul"},(0,r.yg)("strong",{parentName:"li"},"Source"),":",(0,r.yg)("ul",{parentName:"li"},(0,r.yg)("li",{parentName:"ul"},(0,r.yg)("a",{parentName:"li",href:"https://github.com/facebook/memlab/blob/eebc764/packages/core/src/lib/Types.ts#L624"},"core/src/lib/Types.ts:624"))))),(0,r.yg)("hr",null),(0,r.yg)("h3",{id:"-runmetainfo-object"},(0,r.yg)("a",{id:"runmetainfo",name:"runmetainfo"})," ",(0,r.yg)("strong",{parentName:"h3"},"RunMetaInfo"),": ",(0,r.yg)("inlineCode",{parentName:"h3"},"Object")),(0,r.yg)("p",null,"This data structure holds the information about memlab run.\nYou can retrieve the instance of this type through ",(0,r.yg)("a",{parentName:"p",href:"/memlab/docs/api/classes/api_src.BrowserInteractionResultReader#getrunmetainfo"},"getRunMetaInfo"),"."),(0,r.yg)("table",null,(0,r.yg)("thead",{parentName:"table"},(0,r.yg)("tr",{parentName:"thead"},(0,r.yg)("th",{parentName:"tr",align:"left"},"Name"),(0,r.yg)("th",{parentName:"tr",align:"left"},"Type"),(0,r.yg)("th",{parentName:"tr",align:"left"},"Description"))),(0,r.yg)("tbody",{parentName:"table"},(0,r.yg)("tr",{parentName:"tbody"},(0,r.yg)("td",{parentName:"tr",align:"left"},(0,r.yg)("inlineCode",{parentName:"td"},"browserInfo")),(0,r.yg)("td",{parentName:"tr",align:"left"},(0,r.yg)("a",{parentName:"td",href:"/memlab/docs/api/interfaces/core_src.IBrowserInfo"},(0,r.yg)("inlineCode",{parentName:"a"},"IBrowserInfo"))),(0,r.yg)("td",{parentName:"tr",align:"left"},"input configuration for the browser and output data from the browser")),(0,r.yg)("tr",{parentName:"tbody"},(0,r.yg)("td",{parentName:"tr",align:"left"},(0,r.yg)("inlineCode",{parentName:"td"},"type")),(0,r.yg)("td",{parentName:"tr",align:"left"},(0,r.yg)("inlineCode",{parentName:"td"},"string")),(0,r.yg)("td",{parentName:"tr",align:"left"},"type of the memlab run")))),(0,r.yg)("ul",null,(0,r.yg)("li",{parentName:"ul"},(0,r.yg)("strong",{parentName:"li"},"Source"),":",(0,r.yg)("ul",{parentName:"li"},(0,r.yg)("li",{parentName:"ul"},(0,r.yg)("a",{parentName:"li",href:"https://github.com/facebook/memlab/blob/eebc764/packages/core/src/lib/Types.ts#L1247"},"core/src/lib/Types.ts:1247"))))),(0,r.yg)("hr",null),(0,r.yg)("h3",{id:"-undefinablet-t--undefined"},(0,r.yg)("a",{id:"undefinable",name:"undefinable"})," ",(0,r.yg)("strong",{parentName:"h3"},"Undefinable"),"<",(0,r.yg)("inlineCode",{parentName:"h3"},"T"),">",": ",(0,r.yg)("inlineCode",{parentName:"h3"},"T")," ","|"," ",(0,r.yg)("inlineCode",{parentName:"h3"},"undefined")),(0,r.yg)("p",null,"Given any type ",(0,r.yg)("inlineCode",{parentName:"p"},"T"),", return the union type ",(0,r.yg)("inlineCode",{parentName:"p"},"T")," and ",(0,r.yg)("inlineCode",{parentName:"p"},"undefined"),"."),(0,r.yg)("h4",{id:"type-parameters-3"},"Type parameters"),(0,r.yg)("table",null,(0,r.yg)("thead",{parentName:"table"},(0,r.yg)("tr",{parentName:"thead"},(0,r.yg)("th",{parentName:"tr",align:"left"},"Name"),(0,r.yg)("th",{parentName:"tr",align:"left"},"Description"))),(0,r.yg)("tbody",{parentName:"table"},(0,r.yg)("tr",{parentName:"tbody"},(0,r.yg)("td",{parentName:"tr",align:"left"},(0,r.yg)("inlineCode",{parentName:"td"},"T")),(0,r.yg)("td",{parentName:"tr",align:"left"},"The type that will be made undefinable.")))),(0,r.yg)("ul",null,(0,r.yg)("li",{parentName:"ul"},(0,r.yg)("strong",{parentName:"li"},"Source"),":",(0,r.yg)("ul",{parentName:"li"},(0,r.yg)("li",{parentName:"ul"},(0,r.yg)("a",{parentName:"li",href:"https://github.com/facebook/memlab/blob/eebc764/packages/core/src/lib/Types.ts#L44"},"core/src/lib/Types.ts:44"))))),(0,r.yg)("h2",{id:"functions"},"Functions"),(0,r.yg)("h3",{id:"dumpnodeheapsnapshot"},(0,r.yg)("a",{id:"dumpnodeheapsnapshot"}),(0,r.yg)("strong",{parentName:"h3"},"dumpNodeHeapSnapshot"),"()"),(0,r.yg)("p",null,"Take a heap snapshot of the current program state and save it as a\n",(0,r.yg)("inlineCode",{parentName:"p"},".heapsnapshot")," file under a randomly generated folder inside the system's\ntemp folder."),(0,r.yg)("p",null,(0,r.yg)("strong",{parentName:"p"},"Note"),": All ",(0,r.yg)("inlineCode",{parentName:"p"},".heapsnapshot")," files could also be loaded by Chrome DevTools."),(0,r.yg)("ul",null,(0,r.yg)("li",{parentName:"ul"},(0,r.yg)("p",{parentName:"li"},(0,r.yg)("strong",{parentName:"p"},"Returns"),": ",(0,r.yg)("inlineCode",{parentName:"p"},"string")," | the absolute file path to the saved ",(0,r.yg)("inlineCode",{parentName:"p"},".heapsnapshot")," file.")),(0,r.yg)("li",{parentName:"ul"},(0,r.yg)("p",{parentName:"li"},(0,r.yg)("strong",{parentName:"p"},"Examples"),":"))),(0,r.yg)("pre",null,(0,r.yg)("code",{parentName:"pre",className:"language-typescript"},"import type {IHeapSnapshot} from '@memlab/core';\nimport {dumpNodeHeapSnapshot} from '@memlab/core';\nimport {getFullHeapFromFile} from '@memlab/heap-analysis';\n\n(async function () {\n const heapFile = dumpNodeHeapSnapshot();\n const heap: IHeapSnapshot = await getFullHeapFromFile(heapFile);\n})();\n")),(0,r.yg)("ul",null,(0,r.yg)("li",{parentName:"ul"},(0,r.yg)("strong",{parentName:"li"},"Source"),":",(0,r.yg)("ul",{parentName:"li"},(0,r.yg)("li",{parentName:"ul"},(0,r.yg)("a",{parentName:"li",href:"https://github.com/facebook/memlab/blob/eebc764/packages/core/src/lib/NodeHeap.ts#L84"},"core/src/lib/NodeHeap.ts:84"))))),(0,r.yg)("hr",null),(0,r.yg)("h3",{id:"tagobjectto-tag"},(0,r.yg)("a",{id:"tagobject"}),(0,r.yg)("strong",{parentName:"h3"},"tagObject"),"<",(0,r.yg)("inlineCode",{parentName:"h3"},"T"),">","(",(0,r.yg)("inlineCode",{parentName:"h3"},"o"),", ",(0,r.yg)("inlineCode",{parentName:"h3"},"tag"),")"),(0,r.yg)("p",null,"Tags a string marker to an object instance, which can later be checked by\n",(0,r.yg)("a",{parentName:"p",href:"/memlab/docs/api/interfaces/core_src.IHeapSnapshot#hasobjectwithtag"},"hasObjectWithTag"),". This API does not modify the object instance in\nany way (e.g., no additional or hidden properties added to the tagged\nobject)."),(0,r.yg)("h4",{id:"type-parameters-4"},"Type parameters"),(0,r.yg)("table",null,(0,r.yg)("thead",{parentName:"table"},(0,r.yg)("tr",{parentName:"thead"},(0,r.yg)("th",{parentName:"tr",align:"left"},"Name"),(0,r.yg)("th",{parentName:"tr",align:"left"},"Type"))),(0,r.yg)("tbody",{parentName:"table"},(0,r.yg)("tr",{parentName:"tbody"},(0,r.yg)("td",{parentName:"tr",align:"left"},(0,r.yg)("inlineCode",{parentName:"td"},"T")),(0,r.yg)("td",{parentName:"tr",align:"left"},"extends ",(0,r.yg)("inlineCode",{parentName:"td"},"object"))))),(0,r.yg)("ul",null,(0,r.yg)("li",{parentName:"ul"},(0,r.yg)("strong",{parentName:"li"},"Parameters"),":",(0,r.yg)("ul",{parentName:"li"},(0,r.yg)("li",{parentName:"ul"},(0,r.yg)("inlineCode",{parentName:"li"},"o"),": ",(0,r.yg)("inlineCode",{parentName:"li"},"T")," | specify the object instance you want to tag, you cannot tag a ",(0,r.yg)("a",{parentName:"li",href:"https://developer.mozilla.org/en-US/docs/Glossary/Primitive"},"primitive"),"."),(0,r.yg)("li",{parentName:"ul"},(0,r.yg)("inlineCode",{parentName:"li"},"tag"),": ",(0,r.yg)("inlineCode",{parentName:"li"},"string")," | marker name to tag on the object instance"))),(0,r.yg)("li",{parentName:"ul"},(0,r.yg)("strong",{parentName:"li"},"Returns"),": ",(0,r.yg)("inlineCode",{parentName:"li"},"T")," | returns the tagged object instance (same reference as\nthe input argument ",(0,r.yg)("inlineCode",{parentName:"li"},"o"),")"),(0,r.yg)("li",{parentName:"ul"},(0,r.yg)("strong",{parentName:"li"},"Examples"),":")),(0,r.yg)("pre",null,(0,r.yg)("code",{parentName:"pre",className:"language-typescript"},"import type {IHeapSnapshot, AnyValue} from '@memlab/core';\nimport {config, takeNodeMinimalHeap, tagObject} from '@memlab/core';\n\ntest('memory test', async () => {\n config.muteConsole = true;\n const o1: AnyValue = {};\n let o2: AnyValue = {};\n\n // tag o1 with marker: \"memlab-mark-1\", does not modify o1 in any way\n tagObject(o1, 'memlab-mark-1');\n // tag o2 with marker: \"memlab-mark-2\", does not modify o2 in any way\n tagObject(o2, 'memlab-mark-2');\n\n o2 = null;\n\n const heap: IHeapSnapshot = await takeNodeMinimalHeap();\n\n // expect object with marker \"memlab-mark-1\" exists\n expect(heap.hasObjectWithTag('memlab-mark-1')).toBe(true);\n\n // expect object with marker \"memlab-mark-2\" can be GCed\n expect(heap.hasObjectWithTag('memlab-mark-2')).toBe(false);\n\n}, 30000);\n")),(0,r.yg)("ul",null,(0,r.yg)("li",{parentName:"ul"},(0,r.yg)("strong",{parentName:"li"},"Source"),":",(0,r.yg)("ul",{parentName:"li"},(0,r.yg)("li",{parentName:"ul"},(0,r.yg)("a",{parentName:"li",href:"https://github.com/facebook/memlab/blob/eebc764/packages/core/src/lib/NodeHeap.ts#L59"},"core/src/lib/NodeHeap.ts:59"))))),(0,r.yg)("hr",null),(0,r.yg)("h3",{id:"takenodeminimalheap"},(0,r.yg)("a",{id:"takenodeminimalheap"}),(0,r.yg)("strong",{parentName:"h3"},"takeNodeMinimalHeap"),"()"),(0,r.yg)("p",null,"Take a heap snapshot of the current program state\nand parse it as ",(0,r.yg)("a",{parentName:"p",href:"/memlab/docs/api/interfaces/core_src.IHeapSnapshot"},"IHeapSnapshot"),". Notice that\nthis API does not calculate some heap analysis meta data\nfor heap analysis. But this also means faster heap parsing."),(0,r.yg)("ul",null,(0,r.yg)("li",{parentName:"ul"},(0,r.yg)("p",{parentName:"li"},(0,r.yg)("strong",{parentName:"p"},"Returns"),": ",(0,r.yg)("inlineCode",{parentName:"p"},"Promise"),"<",(0,r.yg)("a",{parentName:"p",href:"/memlab/docs/api/interfaces/core_src.IHeapSnapshot"},(0,r.yg)("inlineCode",{parentName:"a"},"IHeapSnapshot")),">"," | heap representation without heap analysis meta data.")),(0,r.yg)("li",{parentName:"ul"},(0,r.yg)("p",{parentName:"li"},(0,r.yg)("strong",{parentName:"p"},"Examples:")))),(0,r.yg)("pre",null,(0,r.yg)("code",{parentName:"pre",className:"language-typescript"},"import type {IHeapSnapshot} from '@memlab/core';\nimport {takeNodeMinimalHeap} from '@memlab/core';\n\n(async function () {\n const heap: IHeapSnapshot = await takeNodeMinimalHeap();\n})();\n")),(0,r.yg)("p",null,"If you need to get the heap snapshot with heap analysis meta data, please\nuse ",(0,r.yg)("a",{parentName:"p",href:"/memlab/docs/api/modules/heap_analysis_src#getfullheapfromfile"},"getFullHeapFromFile"),"."),(0,r.yg)("ul",null,(0,r.yg)("li",{parentName:"ul"},(0,r.yg)("strong",{parentName:"li"},"Source"),":",(0,r.yg)("ul",{parentName:"li"},(0,r.yg)("li",{parentName:"ul"},(0,r.yg)("a",{parentName:"li",href:"https://github.com/facebook/memlab/blob/eebc764/packages/core/src/lib/NodeHeap.ts#L152"},"core/src/lib/NodeHeap.ts:152"))))))}c.isMDXComponent=!0}}]); \ No newline at end of file diff --git a/assets/js/27652c34.36974e12.js b/assets/js/27652c34.152eadc0.js similarity index 96% rename from assets/js/27652c34.36974e12.js rename to assets/js/27652c34.152eadc0.js index c1ccb932..9c349a10 100644 --- a/assets/js/27652c34.36974e12.js +++ b/assets/js/27652c34.152eadc0.js @@ -1 +1 @@ -"use strict";(self.webpackChunkmemlab_website=self.webpackChunkmemlab_website||[]).push([[8417],{5680:(e,a,n)=>{n.d(a,{xA:()=>s,yg:()=>y});var r=n(6540);function t(e,a,n){return a in 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from\n",(0,t.yg)("a",{parentName:"p",href:"/memlab/docs/api/classes/api_src.BrowserInteractionResultReader"},"BrowserInteractionResultReader"),"."),(0,t.yg)("ul",null,(0,t.yg)("li",{parentName:"ul"},(0,t.yg)("strong",{parentName:"li"},"Source"),":",(0,t.yg)("ul",{parentName:"li"},(0,t.yg)("li",{parentName:"ul"},(0,t.yg)("a",{parentName:"li",href:"https://github.com/facebook/memlab/blob/c360a62/packages/heap-analysis/src/PluginUtils.ts#L396"},"heap-analysis/src/PluginUtils.ts:396"))))),(0,t.yg)("hr",null),(0,t.yg)("h3",{id:"getsnapshotfileforanalysisoptions"},(0,t.yg)("a",{id:"getsnapshotfileforanalysis"}),(0,t.yg)("strong",{parentName:"h3"},"getSnapshotFileForAnalysis"),"(",(0,t.yg)("inlineCode",{parentName:"h3"},"options"),")"),(0,t.yg)("p",null,"Get the heap snapshot file's absolute path passed to the hosting heap\nanalysis via ",(0,t.yg)("inlineCode",{parentName:"p"},"HeapAnalysisOptions"),"."),(0,t.yg)("p",null,"This API is supposed to be used within the overridden ",(0,t.yg)("inlineCode",{parentName:"p"},"process")," method\nof an ",(0,t.yg)("inlineCode",{parentName:"p"},"BaseAnalysis")," instance."),(0,t.yg)("ul",null,(0,t.yg)("li",{parentName:"ul"},(0,t.yg)("strong",{parentName:"li"},"Parameters"),":",(0,t.yg)("ul",{parentName:"li"},(0,t.yg)("li",{parentName:"ul"},(0,t.yg)("inlineCode",{parentName:"li"},"options"),": ",(0,t.yg)("a",{parentName:"li",href:"/memlab/docs/api/modules/heap_analysis_src#heapanalysisoptions"},(0,t.yg)("inlineCode",{parentName:"a"},"HeapAnalysisOptions"))," | this is the auto-generated input passed to all the ",(0,t.yg)("inlineCode",{parentName:"li"},"BaseAnalysis")," instances"))),(0,t.yg)("li",{parentName:"ul"},(0,t.yg)("strong",{parentName:"li"},"Returns"),": ",(0,t.yg)("inlineCode",{parentName:"li"},"string")," | the absolute path of the heap snapshot file"),(0,t.yg)("li",{parentName:"ul"},(0,t.yg)("strong",{parentName:"li"},"Examples:"))),(0,t.yg)("pre",null,(0,t.yg)("code",{parentName:"pre",className:"language-typescript"},"import type {IHeapSnapshot} from '@memlab/core';\nimport type {HeapAnalysisOptions} from '@memlab/heap-analysis';\nimport {getSnapshotFileForAnalysis, BaseAnalysis} from '@memlab/heap-analysis';\n\nclass ExampleAnalysis extends BaseAnalysis {\n public getCommandName(): string {\n return 'example-analysis';\n }\n\n public getDescription(): string {\n return 'an example analysis for demo';\n }\n\n async process(options: HeapAnalysisOptions): Promise {\n const file = getSnapshotFileForAnalysis(options);\n }\n}\n")),(0,t.yg)("p",null,"Use the following code to invoke the heap analysis:"),(0,t.yg)("pre",null,(0,t.yg)("code",{parentName:"pre",className:"language-typescript"},"const analysis = new ExampleAnalysis();\n// any .heapsnapshot file recorded by memlab or saved manually from Chrome\nawait 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",(0,t.yg)("a",{parentName:"p",href:"/memlab/docs/api/classes/api_src.BrowserInteractionResultReader"},"BrowserInteractionResultReader"),"."),(0,t.yg)("ul",null,(0,t.yg)("li",{parentName:"ul"},(0,t.yg)("strong",{parentName:"li"},"Source"),":",(0,t.yg)("ul",{parentName:"li"},(0,t.yg)("li",{parentName:"ul"},(0,t.yg)("a",{parentName:"li",href:"https://github.com/facebook/memlab/blob/c360a62/packages/heap-analysis/src/PluginUtils.ts#L347"},"heap-analysis/src/PluginUtils.ts:347"))))),(0,t.yg)("hr",null),(0,t.yg)("h3",{id:"loadheapsnapshotoptions"},(0,t.yg)("a",{id:"loadheapsnapshot"}),(0,t.yg)("strong",{parentName:"h3"},"loadHeapSnapshot"),"(",(0,t.yg)("inlineCode",{parentName:"h3"},"options"),")"),(0,t.yg)("p",null,"Load the heap graph based on the single JavaScript heap snapshot\npassed to the hosting heap analysis via ",(0,t.yg)("inlineCode",{parentName:"p"},"HeapAnalysisOptions"),"."),(0,t.yg)("p",null,"This API is supposed to be used within the ",(0,t.yg)("inlineCode",{parentName:"p"},"process")," implementation\nof an ",(0,t.yg)("inlineCode",{parentName:"p"},"BaseAnalysis")," instance."),(0,t.yg)("ul",null,(0,t.yg)("li",{parentName:"ul"},(0,t.yg)("strong",{parentName:"li"},"Parameters"),":",(0,t.yg)("ul",{parentName:"li"},(0,t.yg)("li",{parentName:"ul"},(0,t.yg)("inlineCode",{parentName:"li"},"options"),": ",(0,t.yg)("a",{parentName:"li",href:"/memlab/docs/api/modules/heap_analysis_src#heapanalysisoptions"},(0,t.yg)("inlineCode",{parentName:"a"},"HeapAnalysisOptions"))," | this is the auto-generated input passed to all the ",(0,t.yg)("inlineCode",{parentName:"li"},"BaseAnalysis")," instances"))),(0,t.yg)("li",{parentName:"ul"},(0,t.yg)("strong",{parentName:"li"},"Returns"),": ",(0,t.yg)("inlineCode",{parentName:"li"},"Promise"),"<",(0,t.yg)("inlineCode",{parentName:"li"},"IHeapSnapshot"),">"," | the graph representation of the heap"),(0,t.yg)("li",{parentName:"ul"},(0,t.yg)("strong",{parentName:"li"},"Examples:"))),(0,t.yg)("pre",null,(0,t.yg)("code",{parentName:"pre",className:"language-typescript"},"import type {IHeapSnapshot} from '@memlab/core';\nimport type {HeapAnalysisOptions} from '@memlab/heap-analysis';\nimport {loadHeapSnapshot, BaseAnalysis} from '@memlab/heap-analysis';\n\nclass ExampleAnalysis extends BaseAnalysis {\n public getCommandName(): string {\n return 'example-analysis';\n }\n\n public getDescription(): string {\n return 'an example analysis for demo';\n }\n\n async process(options: HeapAnalysisOptions): Promise {\n const heap = await loadHeapSnapshot(options);\n // doing heap analysis\n }\n}\n")),(0,t.yg)("p",null,"Use the following code to invoke the heap analysis:"),(0,t.yg)("pre",null,(0,t.yg)("code",{parentName:"pre",className:"language-typescript"},"const analysis = new ExampleAnalysis();\n// any .heapsnapshot file recorded by memlab or saved manually from Chrome\nawait 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analysis is taking multiple heap snapshots as input for memory\nanalysis (e.g., finding which object keeps growing in size in a series of\nheap snapshots), this API could be used to do\n",(0,t.yg)("a",{parentName:"p",href:"https://en.wikipedia.org/wiki/MapReduce"},"MapRedue")," on all heap snapshots."),(0,t.yg)("p",null,"This API is supposed to be used within the ",(0,t.yg)("inlineCode",{parentName:"p"},"process")," implementation\nof an ",(0,t.yg)("inlineCode",{parentName:"p"},"BaseAnalysis")," instance that is designed to analyze multiple heap\nsnapshots (as an example, finding which object keeps growing overtime)"),(0,t.yg)("h4",{id:"type-parameters"},"Type parameters"),(0,t.yg)("table",null,(0,t.yg)("thead",{parentName:"table"},(0,t.yg)("tr",{parentName:"thead"},(0,t.yg)("th",{parentName:"tr",align:"left"},"Name"),(0,t.yg)("th",{parentName:"tr",align:"left"},"Description"))),(0,t.yg)("tbody",{parentName:"table"},(0,t.yg)("tr",{parentName:"tbody"},(0,t.yg)("td",{parentName:"tr",align:"left"},(0,t.yg)("inlineCode",{parentName:"td"},"T1")),(0,t.yg)("td",{parentName:"tr",align:"left"},"the type of the intermediate result from each map function call")),(0,t.yg)("tr",{parentName:"tbody"},(0,t.yg)("td",{parentName:"tr",align:"left"},(0,t.yg)("inlineCode",{parentName:"td"},"T2")),(0,t.yg)("td",{parentName:"tr",align:"left"},"the type of the final result of the reduce function call")))),(0,t.yg)("ul",null,(0,t.yg)("li",{parentName:"ul"},(0,t.yg)("strong",{parentName:"li"},"Parameters"),":",(0,t.yg)("ul",{parentName:"li"},(0,t.yg)("li",{parentName:"ul"},(0,t.yg)("inlineCode",{parentName:"li"},"mapCallback"),": (",(0,t.yg)("inlineCode",{parentName:"li"},"snapshot"),": ",(0,t.yg)("inlineCode",{parentName:"li"},"IHeapSnapshot"),", ",(0,t.yg)("inlineCode",{parentName:"li"},"i"),": ",(0,t.yg)("inlineCode",{parentName:"li"},"number"),", ",(0,t.yg)("inlineCode",{parentName:"li"},"file"),": ",(0,t.yg)("inlineCode",{parentName:"li"},"string"),") => ",(0,t.yg)("inlineCode",{parentName:"li"},"T1")," | the map function in MapReduce, the function will be applied to each heap snapshot"),(0,t.yg)("li",{parentName:"ul"},(0,t.yg)("inlineCode",{parentName:"li"},"reduceCallback"),": (",(0,t.yg)("inlineCode",{parentName:"li"},"results"),": ",(0,t.yg)("inlineCode",{parentName:"li"},"T1"),"[]) => ",(0,t.yg)("inlineCode",{parentName:"li"},"T2")," | the reduce function in MapReduce, the function will take as input all intermediate results from all map function calls"),(0,t.yg)("li",{parentName:"ul"},(0,t.yg)("inlineCode",{parentName:"li"},"options"),": ",(0,t.yg)("a",{parentName:"li",href:"/memlab/docs/api/modules/heap_analysis_src#heapanalysisoptions"},(0,t.yg)("inlineCode",{parentName:"a"},"HeapAnalysisOptions"))," | this is the auto-generated input passed to all the ",(0,t.yg)("inlineCode",{parentName:"li"},"BaseAnalysis")," instances"))),(0,t.yg)("li",{parentName:"ul"},(0,t.yg)("strong",{parentName:"li"},"Returns"),": ",(0,t.yg)("inlineCode",{parentName:"li"},"Promise"),"<",(0,t.yg)("inlineCode",{parentName:"li"},"T2"),">"," | the return value of your reduce function"),(0,t.yg)("li",{parentName:"ul"},(0,t.yg)("strong",{parentName:"li"},"Examples:"))),(0,t.yg)("pre",null,(0,t.yg)("code",{parentName:"pre",className:"language-typescript"},"import type {IHeapSnapshot} from '@memlab/core';\nimport type {HeapAnalysisOptions} from '@memlab/heap-analysis';\nimport {snapshotMapReduce, BaseAnalysis} from '@memlab/heap-analysis';\n\nclass ExampleAnalysis extends BaseAnalysis {\n public getCommandName(): string {\n return 'example-analysis';\n }\n\n public getDescription(): string {\n return 'an example analysis for demo';\n }\n\n async process(options: HeapAnalysisOptions): Promise {\n // check if the number of heap objects keeps growing overtime\n const isMonotonicIncreasing = await snapshotMapReduce(\n (heap) => heap.nodes.length,\n (nodeCounts) =>\n nodeCounts[0] < nodeCounts[nodeCounts.length - 1] &&\n nodeCounts.every((count, i) => i === 0 || count >= nodeCounts[i - 1]),\n options,\n );\n }\n}\n")),(0,t.yg)("p",null,"Use the following code to invoke the heap analysis:"),(0,t.yg)("pre",null,(0,t.yg)("code",{parentName:"pre",className:"language-typescript"},"const analysis = new ExampleAnalysis();\n// snapshotDir includes a series of .heapsnapshot files recorded by\n// memlab or saved manually from Chrome, those files will be loaded\n// in alphanumerically ascending order\nawait analysis.analyzeSnapshotsInDirectory(snapshotDir);\n")),(0,t.yg)("p",null,"The new heap analysis can also be used with 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possible."),(0,t.yg)("ul",null,(0,t.yg)("li",{parentName:"ul"},(0,t.yg)("strong",{parentName:"li"},"Source"),":",(0,t.yg)("ul",{parentName:"li"},(0,t.yg)("li",{parentName:"ul"},(0,t.yg)("a",{parentName:"li",href:"https://github.com/facebook/memlab/blob/c360a62/packages/heap-analysis/src/PluginUtils.ts#L592"},"heap-analysis/src/PluginUtils.ts:592"))))),(0,t.yg)("hr",null),(0,t.yg)("h3",{id:"takenodefullheap"},(0,t.yg)("a",{id:"takenodefullheap"}),(0,t.yg)("strong",{parentName:"h3"},"takeNodeFullHeap"),"()"),(0,t.yg)("p",null,"Take a heap snapshot of the current program state\nand parse it as ",(0,t.yg)("a",{parentName:"p",href:"/memlab/docs/api/interfaces/core_src.IHeapSnapshot"},"IHeapSnapshot"),". 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",(0,t.yg)("a",{parentName:"p",href:"/memlab/docs/api/classes/api_src.BrowserInteractionResultReader"},"BrowserInteractionResultReader"),"."),(0,t.yg)("ul",null,(0,t.yg)("li",{parentName:"ul"},(0,t.yg)("strong",{parentName:"li"},"Source"),":",(0,t.yg)("ul",{parentName:"li"},(0,t.yg)("li",{parentName:"ul"},(0,t.yg)("a",{parentName:"li",href:"https://github.com/facebook/memlab/blob/eebc764/packages/heap-analysis/src/PluginUtils.ts#L347"},"heap-analysis/src/PluginUtils.ts:347"))))),(0,t.yg)("hr",null),(0,t.yg)("h3",{id:"loadheapsnapshotoptions"},(0,t.yg)("a",{id:"loadheapsnapshot"}),(0,t.yg)("strong",{parentName:"h3"},"loadHeapSnapshot"),"(",(0,t.yg)("inlineCode",{parentName:"h3"},"options"),")"),(0,t.yg)("p",null,"Load the heap graph based on the single JavaScript heap snapshot\npassed to the hosting heap analysis via ",(0,t.yg)("inlineCode",{parentName:"p"},"HeapAnalysisOptions"),"."),(0,t.yg)("p",null,"This API is supposed to be used within the ",(0,t.yg)("inlineCode",{parentName:"p"},"process")," implementation\nof an ",(0,t.yg)("inlineCode",{parentName:"p"},"BaseAnalysis")," instance."),(0,t.yg)("ul",null,(0,t.yg)("li",{parentName:"ul"},(0,t.yg)("strong",{parentName:"li"},"Parameters"),":",(0,t.yg)("ul",{parentName:"li"},(0,t.yg)("li",{parentName:"ul"},(0,t.yg)("inlineCode",{parentName:"li"},"options"),": ",(0,t.yg)("a",{parentName:"li",href:"/memlab/docs/api/modules/heap_analysis_src#heapanalysisoptions"},(0,t.yg)("inlineCode",{parentName:"a"},"HeapAnalysisOptions"))," | this is the auto-generated input passed to all the ",(0,t.yg)("inlineCode",{parentName:"li"},"BaseAnalysis")," instances"))),(0,t.yg)("li",{parentName:"ul"},(0,t.yg)("strong",{parentName:"li"},"Returns"),": ",(0,t.yg)("inlineCode",{parentName:"li"},"Promise"),"<",(0,t.yg)("inlineCode",{parentName:"li"},"IHeapSnapshot"),">"," | the graph representation of the heap"),(0,t.yg)("li",{parentName:"ul"},(0,t.yg)("strong",{parentName:"li"},"Examples:"))),(0,t.yg)("pre",null,(0,t.yg)("code",{parentName:"pre",className:"language-typescript"},"import type {IHeapSnapshot} from '@memlab/core';\nimport type {HeapAnalysisOptions} from '@memlab/heap-analysis';\nimport {loadHeapSnapshot, BaseAnalysis} from '@memlab/heap-analysis';\n\nclass ExampleAnalysis extends BaseAnalysis {\n public getCommandName(): string {\n return 'example-analysis';\n }\n\n public getDescription(): string {\n return 'an example analysis for demo';\n }\n\n async process(options: HeapAnalysisOptions): Promise {\n const heap = await loadHeapSnapshot(options);\n // doing heap analysis\n }\n}\n")),(0,t.yg)("p",null,"Use the following code to invoke the heap analysis:"),(0,t.yg)("pre",null,(0,t.yg)("code",{parentName:"pre",className:"language-typescript"},"const analysis = new ExampleAnalysis();\n// any .heapsnapshot file recorded by memlab or saved manually from Chrome\nawait analysis.analyzeSnapshotFromFile(snapshotFile);\n")),(0,t.yg)("p",null,"The new heap analysis can also be used with ",(0,t.yg)("a",{parentName:"p",href:"/memlab/docs/api/modules/api_src#analyze"},"analyze"),", in that case\n",(0,t.yg)("inlineCode",{parentName:"p"},"loadHeapSnapshot")," will use the last heap snapshot in alphanumerically\nascending order from ",(0,t.yg)("a",{parentName:"p",href:"/memlab/docs/api/classes/api_src.BrowserInteractionResultReader"},"BrowserInteractionResultReader"),"."),(0,t.yg)("ul",null,(0,t.yg)("li",{parentName:"ul"},(0,t.yg)("strong",{parentName:"li"},"Source"),":",(0,t.yg)("ul",{parentName:"li"},(0,t.yg)("li",{parentName:"ul"},(0,t.yg)("a",{parentName:"li",href:"https://github.com/facebook/memlab/blob/eebc764/packages/heap-analysis/src/PluginUtils.ts#L450"},"heap-analysis/src/PluginUtils.ts:450"))))),(0,t.yg)("hr",null),(0,t.yg)("h3",{id:"snapshotmapreducet1-t2mapcallback-reducecallback-options"},(0,t.yg)("a",{id:"snapshotmapreduce"}),(0,t.yg)("strong",{parentName:"h3"},"snapshotMapReduce"),"<",(0,t.yg)("inlineCode",{parentName:"h3"},"T1"),", ",(0,t.yg)("inlineCode",{parentName:"h3"},"T2"),">","(",(0,t.yg)("inlineCode",{parentName:"h3"},"mapCallback"),", ",(0,t.yg)("inlineCode",{parentName:"h3"},"reduceCallback"),", ",(0,t.yg)("inlineCode",{parentName:"h3"},"options"),")"),(0,t.yg)("p",null,"When a heap analysis is taking multiple heap snapshots as input for memory\nanalysis (e.g., finding which object keeps growing in size in a series of\nheap snapshots), this API could be used to do\n",(0,t.yg)("a",{parentName:"p",href:"https://en.wikipedia.org/wiki/MapReduce"},"MapRedue")," on all heap snapshots."),(0,t.yg)("p",null,"This API is supposed to be used within the ",(0,t.yg)("inlineCode",{parentName:"p"},"process")," implementation\nof an ",(0,t.yg)("inlineCode",{parentName:"p"},"BaseAnalysis")," instance that is designed to analyze multiple heap\nsnapshots (as an example, finding which object keeps growing overtime)"),(0,t.yg)("h4",{id:"type-parameters"},"Type parameters"),(0,t.yg)("table",null,(0,t.yg)("thead",{parentName:"table"},(0,t.yg)("tr",{parentName:"thead"},(0,t.yg)("th",{parentName:"tr",align:"left"},"Name"),(0,t.yg)("th",{parentName:"tr",align:"left"},"Description"))),(0,t.yg)("tbody",{parentName:"table"},(0,t.yg)("tr",{parentName:"tbody"},(0,t.yg)("td",{parentName:"tr",align:"left"},(0,t.yg)("inlineCode",{parentName:"td"},"T1")),(0,t.yg)("td",{parentName:"tr",align:"left"},"the type of the intermediate result from each map function call")),(0,t.yg)("tr",{parentName:"tbody"},(0,t.yg)("td",{parentName:"tr",align:"left"},(0,t.yg)("inlineCode",{parentName:"td"},"T2")),(0,t.yg)("td",{parentName:"tr",align:"left"},"the type of the final result of the reduce function call")))),(0,t.yg)("ul",null,(0,t.yg)("li",{parentName:"ul"},(0,t.yg)("strong",{parentName:"li"},"Parameters"),":",(0,t.yg)("ul",{parentName:"li"},(0,t.yg)("li",{parentName:"ul"},(0,t.yg)("inlineCode",{parentName:"li"},"mapCallback"),": (",(0,t.yg)("inlineCode",{parentName:"li"},"snapshot"),": ",(0,t.yg)("inlineCode",{parentName:"li"},"IHeapSnapshot"),", ",(0,t.yg)("inlineCode",{parentName:"li"},"i"),": ",(0,t.yg)("inlineCode",{parentName:"li"},"number"),", ",(0,t.yg)("inlineCode",{parentName:"li"},"file"),": ",(0,t.yg)("inlineCode",{parentName:"li"},"string"),") => ",(0,t.yg)("inlineCode",{parentName:"li"},"T1")," | the map function in MapReduce, the function will be applied to each heap snapshot"),(0,t.yg)("li",{parentName:"ul"},(0,t.yg)("inlineCode",{parentName:"li"},"reduceCallback"),": (",(0,t.yg)("inlineCode",{parentName:"li"},"results"),": ",(0,t.yg)("inlineCode",{parentName:"li"},"T1"),"[]) => ",(0,t.yg)("inlineCode",{parentName:"li"},"T2")," | the reduce function in MapReduce, the function will take as input all intermediate results from all map function calls"),(0,t.yg)("li",{parentName:"ul"},(0,t.yg)("inlineCode",{parentName:"li"},"options"),": ",(0,t.yg)("a",{parentName:"li",href:"/memlab/docs/api/modules/heap_analysis_src#heapanalysisoptions"},(0,t.yg)("inlineCode",{parentName:"a"},"HeapAnalysisOptions"))," | this is the auto-generated input passed to all the ",(0,t.yg)("inlineCode",{parentName:"li"},"BaseAnalysis")," instances"))),(0,t.yg)("li",{parentName:"ul"},(0,t.yg)("strong",{parentName:"li"},"Returns"),": ",(0,t.yg)("inlineCode",{parentName:"li"},"Promise"),"<",(0,t.yg)("inlineCode",{parentName:"li"},"T2"),">"," | the return value of your reduce function"),(0,t.yg)("li",{parentName:"ul"},(0,t.yg)("strong",{parentName:"li"},"Examples:"))),(0,t.yg)("pre",null,(0,t.yg)("code",{parentName:"pre",className:"language-typescript"},"import type {IHeapSnapshot} from '@memlab/core';\nimport type {HeapAnalysisOptions} from '@memlab/heap-analysis';\nimport {snapshotMapReduce, BaseAnalysis} from '@memlab/heap-analysis';\n\nclass ExampleAnalysis extends BaseAnalysis {\n public getCommandName(): string {\n return 'example-analysis';\n }\n\n public getDescription(): string {\n return 'an example analysis for demo';\n }\n\n async process(options: HeapAnalysisOptions): Promise {\n // check if the number of heap objects keeps growing overtime\n const isMonotonicIncreasing = await snapshotMapReduce(\n (heap) => heap.nodes.length,\n (nodeCounts) =>\n nodeCounts[0] < nodeCounts[nodeCounts.length - 1] &&\n nodeCounts.every((count, i) => i === 0 || count >= nodeCounts[i - 1]),\n options,\n );\n }\n}\n")),(0,t.yg)("p",null,"Use the following code to invoke the heap analysis:"),(0,t.yg)("pre",null,(0,t.yg)("code",{parentName:"pre",className:"language-typescript"},"const analysis = new ExampleAnalysis();\n// snapshotDir includes a series of .heapsnapshot files recorded by\n// memlab or saved manually from Chrome, those files will be loaded\n// in alphanumerically ascending order\nawait analysis.analyzeSnapshotsInDirectory(snapshotDir);\n")),(0,t.yg)("p",null,"The new heap analysis can also be used with ",(0,t.yg)("a",{parentName:"p",href:"/memlab/docs/api/modules/api_src#analyze"},"analyze"),", in that case\n",(0,t.yg)("inlineCode",{parentName:"p"},"snapshotMapReduce")," will use all the heap snapshot in alphanumerically\nascending order from ",(0,t.yg)("a",{parentName:"p",href:"/memlab/docs/api/classes/api_src.BrowserInteractionResultReader"},"BrowserInteractionResultReader"),"."),(0,t.yg)("p",null,(0,t.yg)("strong",{parentName:"p"},"Why not passing in all heap snapshots as an array of ",(0,t.yg)("a",{parentName:"strong",href:"/memlab/docs/api/interfaces/core_src.IHeapSnapshot"},"IHeapSnapshot"),"s?"),"\nEach heap snapshot could be non-trivial in size, loading them all at once\nmay not be possible."),(0,t.yg)("ul",null,(0,t.yg)("li",{parentName:"ul"},(0,t.yg)("strong",{parentName:"li"},"Source"),":",(0,t.yg)("ul",{parentName:"li"},(0,t.yg)("li",{parentName:"ul"},(0,t.yg)("a",{parentName:"li",href:"https://github.com/facebook/memlab/blob/eebc764/packages/heap-analysis/src/PluginUtils.ts#L592"},"heap-analysis/src/PluginUtils.ts:592"))))),(0,t.yg)("hr",null),(0,t.yg)("h3",{id:"takenodefullheap"},(0,t.yg)("a",{id:"takenodefullheap"}),(0,t.yg)("strong",{parentName:"h3"},"takeNodeFullHeap"),"()"),(0,t.yg)("p",null,"Take a heap snapshot of the current program state\nand parse it as ",(0,t.yg)("a",{parentName:"p",href:"/memlab/docs/api/interfaces/core_src.IHeapSnapshot"},"IHeapSnapshot"),". This\nAPI also calculates some heap analysis meta data\nfor heap analysis. But this also means slower heap parsing\ncomparing with ",(0,t.yg)("a",{parentName:"p",href:"/memlab/docs/api/modules/core_src#takenodeminimalheap"},"takeNodeMinimalHeap"),"."),(0,t.yg)("ul",null,(0,t.yg)("li",{parentName:"ul"},(0,t.yg)("p",{parentName:"li"},(0,t.yg)("strong",{parentName:"p"},"Returns"),": ",(0,t.yg)("inlineCode",{parentName:"p"},"Promise"),"<",(0,t.yg)("inlineCode",{parentName:"p"},"IHeapSnapshot"),">"," | heap representation with heap analysis meta data.")),(0,t.yg)("li",{parentName:"ul"},(0,t.yg)("p",{parentName:"li"},(0,t.yg)("strong",{parentName:"p"},"Examples:")))),(0,t.yg)("pre",null,(0,t.yg)("code",{parentName:"pre",className:"language-typescript"},"import type {IHeapSnapshot} from '@memlab/core';\nimport type {takeNodeFullHeap} from '@memlab/heap-analysis';\n\n(async function () {\n const heap: IHeapSnapshot = await takeNodeFullHeap();\n})();\n")),(0,t.yg)("ul",null,(0,t.yg)("li",{parentName:"ul"},(0,t.yg)("strong",{parentName:"li"},"Source"),":",(0,t.yg)("ul",{parentName:"li"},(0,t.yg)("li",{parentName:"ul"},(0,t.yg)("a",{parentName:"li",href:"https://github.com/facebook/memlab/blob/eebc764/packages/heap-analysis/src/PluginUtils.ts#L507"},"heap-analysis/src/PluginUtils.ts:507"))))))}g.isMDXComponent=!0}}]); \ No newline at end of file diff --git a/assets/js/5be78946.c92e4c22.js b/assets/js/5be78946.f3f27ad9.js similarity index 98% rename from assets/js/5be78946.c92e4c22.js rename to assets/js/5be78946.f3f27ad9.js index b12348ea..76cb8c15 100644 --- a/assets/js/5be78946.c92e4c22.js +++ b/assets/js/5be78946.f3f27ad9.js @@ -1 +1 @@ -"use strict";(self.webpackChunkmemlab_website=self.webpackChunkmemlab_website||[]).push([[8485],{5680:(e,a,n)=>{n.d(a,{xA:()=>p,yg:()=>g});var r=n(6540);function t(e,a,n){return a in 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and",source:"@site/docs/api/interfaces/core_src.ILeakFilter.md",sourceDirName:"api/interfaces",slug:"/api/interfaces/core_src.ILeakFilter",permalink:"/memlab/docs/api/interfaces/core_src.ILeakFilter",draft:!1,editUrl:null,tags:[],version:"current",frontMatter:{id:"core_src.ILeakFilter",title:"Interface: ILeakFilter",sidebar_label:"ILeakFilter",custom_edit_url:null},sidebar:"sidebar",previous:{title:"IHeapStringNode",permalink:"/memlab/docs/api/interfaces/core_src.IHeapStringNode"},next:{title:"IScenario",permalink:"/memlab/docs/api/interfaces/core_src.IScenario"}},s={},c=[{value:"Properties",id:"properties",level:2},{value:' Optional beforeLeakFilter: InitLeakFilterCallback',id:"-optional-beforeleakfilter-initleakfiltercallback",level:3},{value:' Optional leakFilter: LeakFilterCallback',id:"-optional-leakfilter-leakfiltercallback",level:3},{value:' Optional retainerReferenceFilter: ReferenceFilterCallback',id:"-optional-retainerreferencefilter-referencefiltercallback",level:3}],p={toc:c},d="wrapper";function m(e){let{components:a,...n}=e;return(0,t.yg)(d,(0,r.A)({},p,n,{components:a,mdxType:"MDXLayout"}),(0,t.yg)("p",null,"The ",(0,t.yg)("inlineCode",{parentName:"p"},"ILeakFilter")," interface allows you to define a leak detector and\ncustomize the leak filtering logic in memlab (instead of using the\nbuilt-in leak filters)."),(0,t.yg)("p",null,"Use the leak filter definition in command line interface to filter\nleaks detected from browser interactions"),(0,t.yg)("pre",null,(0,t.yg)("code",{parentName:"pre",className:"language-bash"},"memlab run --scenario --leak-filter \n")),(0,t.yg)("p",null,"If you have already run ",(0,t.yg)("inlineCode",{parentName:"p"},"memlab run")," or ",(0,t.yg)("inlineCode",{parentName:"p"},"memlab snapshot")," which saved\nheap snapshot and other meta data on disk, use the following command\nto filter leaks based on those saved heap snapshots (query the default\ndata location by ",(0,t.yg)("inlineCode",{parentName:"p"},"memlab get-default-work-dir"),")."),(0,t.yg)("pre",null,(0,t.yg)("code",{parentName:"pre",className:"language-bash"},"memlab find-leaks --leak-filter \n")),(0,t.yg)("p",null,"Here is an example TypeScript file defining a leak filter.\nThe command line interface only accepts compiled JavaScript file.\nYou can also define the leak filter in JavaScript (without the\ntype annotations."),(0,t.yg)("pre",null,(0,t.yg)("code",{parentName:"pre",className:"language-typescript"},"import {IHeapNode, IHeapSnapshot, HeapNodeIdSet, utils} from '@memlab/core';\n\nfunction initMap(snapshot: IHeapSnapshot): Record {\n const map = Object.create(null);\n snapshot.nodes.forEach(node => {\n if (node.type !== 'string') {\n return;\n }\n const str = utils.getStringNodeValue(node);\n if (str in map) {\n ++map[str];\n } else {\n map[str] = 1;\n }\n });\n return map;\n}\nconst beforeLeakFilter = (snapshot: IHeapSnapshot, _leakedNodeIds: HeapNodeIdSet): void => {\n map = initMap(snapshot);\n};\n\n// duplicated string with size > 1KB as memory leak\nconst leakFilter = (node: IHeapNode): boolean => {\n if (node.type !== 'string' || node.retainedSize < 1000) {\n return false;\n }\n const str = utils.getStringNodeValue(node);\n return map[str] > 1;\n};\n\nexport default {beforeLeakFilter, leakFilter};\n")),(0,t.yg)("h2",{id:"properties"},"Properties"),(0,t.yg)("h3",{id:"-optional-beforeleakfilter-initleakfiltercallback"},(0,t.yg)("a",{id:"beforeleakfilter",name:"beforeleakfilter"})," ",(0,t.yg)("inlineCode",{parentName:"h3"},"Optional")," ",(0,t.yg)("strong",{parentName:"h3"},"beforeLeakFilter"),": ",(0,t.yg)("a",{parentName:"h3",href:"/memlab/docs/api/modules/core_src#initleakfiltercallback"},(0,t.yg)("inlineCode",{parentName:"a"},"InitLeakFilterCallback"))),(0,t.yg)("p",null,"Lifecycle function callback that is invoked initially once before\nthe subsequent ",(0,t.yg)("inlineCode",{parentName:"p"},"leakFilter")," function calls. This callback could\nbe used to initialize some data stores or any one-off\npreprocessings."),(0,t.yg)("ul",null,(0,t.yg)("li",{parentName:"ul"},(0,t.yg)("ul",{parentName:"li"},(0,t.yg)("li",{parentName:"ul"},(0,t.yg)("strong",{parentName:"li"},"Parameters"),":"),(0,t.yg)("li",{parentName:"ul"},(0,t.yg)("inlineCode",{parentName:"li"},"snapshot"),": ",(0,t.yg)("code",null,(0,t.yg)("a",{parentName:"li",href:"/memlab/docs/api/interfaces/core_src.IHeapSnapshot"},"IHeapSnapshot"))," | the final heap\nsnapshot taken after all browser interactions are done.\nCheck out ",(0,t.yg)("a",{parentName:"li",href:"/memlab/docs/api/interfaces/core_src.IHeapSnapshot"},"IHeapSnapshot")," for more APIs that queries the\nheap snapshot."),(0,t.yg)("li",{parentName:"ul"},(0,t.yg)("inlineCode",{parentName:"li"},"leakedNodeIds"),": ",(0,t.yg)("inlineCode",{parentName:"li"},"Set")," | the set of ids of all JS heap objects\nallocated by the ",(0,t.yg)("inlineCode",{parentName:"li"},"action")," call but not released after the ",(0,t.yg)("inlineCode",{parentName:"li"},"back")," call\nin browser."))),(0,t.yg)("li",{parentName:"ul"},(0,t.yg)("p",{parentName:"li"},(0,t.yg)("strong",{parentName:"p"},"Examples"),":"))),(0,t.yg)("pre",null,(0,t.yg)("code",{parentName:"pre",className:"language-javascript"},"module.exports = {\n beforeLeakFilter: (snapshot, leakedNodeIds) {\n // initialize some data stores\n },\n leakFilter(node, snapshot, leakedNodeIds) {\n // use the data stores\n },\n};\n")),(0,t.yg)("ul",null,(0,t.yg)("li",{parentName:"ul"},(0,t.yg)("strong",{parentName:"li"},"Source"),":",(0,t.yg)("ul",{parentName:"li"},(0,t.yg)("li",{parentName:"ul"},(0,t.yg)("a",{parentName:"li",href:"https://github.com/facebook/memlab/blob/c360a62/packages/core/src/lib/Types.ts#L428"},"core/src/lib/Types.ts:428"))))),(0,t.yg)("hr",null),(0,t.yg)("h3",{id:"-optional-leakfilter-leakfiltercallback"},(0,t.yg)("a",{id:"leakfilter",name:"leakfilter"})," ",(0,t.yg)("inlineCode",{parentName:"h3"},"Optional")," ",(0,t.yg)("strong",{parentName:"h3"},"leakFilter"),": ",(0,t.yg)("a",{parentName:"h3",href:"/memlab/docs/api/modules/core_src#leakfiltercallback"},(0,t.yg)("inlineCode",{parentName:"a"},"LeakFilterCallback"))),(0,t.yg)("p",null,"This callback defines how you want to filter out the\nleaked objects. The callback is called for every node (JS heap\nobject in browser) allocated by the ",(0,t.yg)("inlineCode",{parentName:"p"},"action")," callback, but not\nreleased after the ",(0,t.yg)("inlineCode",{parentName:"p"},"back")," callback. Those objects could be caches\nthat are retained in memory on purpose, or they are memory leaks."),(0,t.yg)("p",null,"This optional callback allows you to define your own algorithm\nto cherry pick memory leaks for specific JS program under test."),(0,t.yg)("p",null,"If this optional callback is not defined, memlab will use its\nbuilt-in leak filter, which considers detached DOM elements\nand unmounted Fiber nodes (detached from React Fiber tree) as\nmemory leaks."),(0,t.yg)("ul",null,(0,t.yg)("li",{parentName:"ul"},(0,t.yg)("p",{parentName:"li"},(0,t.yg)("strong",{parentName:"p"},"Parameters"),":"),(0,t.yg)("ul",{parentName:"li"},(0,t.yg)("li",{parentName:"ul"},(0,t.yg)("inlineCode",{parentName:"li"},"node"),": ",(0,t.yg)("code",null,(0,t.yg)("a",{parentName:"li",href:"/memlab/docs/api/interfaces/core_src.IHeapNode"},"IHeapNode"))," | the heap object\nallocated but not released. This filter callback will be applied\nto each node allocated but not released in the heap snapshot."),(0,t.yg)("li",{parentName:"ul"},(0,t.yg)("inlineCode",{parentName:"li"},"snapshot"),": ",(0,t.yg)("code",null,(0,t.yg)("a",{parentName:"li",href:"/memlab/docs/api/interfaces/core_src.IHeapSnapshot"},"IHeapSnapshot"))," | the final heap\nsnapshot taken after all browser interactions are done.\nCheck out ",(0,t.yg)("a",{parentName:"li",href:"/memlab/docs/api/interfaces/core_src.IHeapSnapshot"},"IHeapSnapshot")," for more APIs that queries the\nheap snapshot."),(0,t.yg)("li",{parentName:"ul"},(0,t.yg)("inlineCode",{parentName:"li"},"leakedNodeIds"),": ",(0,t.yg)("inlineCode",{parentName:"li"},"Set")," | the set of ids of all JS heap objects\nallocated by the ",(0,t.yg)("inlineCode",{parentName:"li"},"action")," call but not released after the ",(0,t.yg)("inlineCode",{parentName:"li"},"back")," call\nin browser."))),(0,t.yg)("li",{parentName:"ul"},(0,t.yg)("p",{parentName:"li"},(0,t.yg)("strong",{parentName:"p"},"Returns"),": the boolean value indicating whether the given node in\nthe snapshot should be considered as leaked.")),(0,t.yg)("li",{parentName:"ul"},(0,t.yg)("p",{parentName:"li"},(0,t.yg)("strong",{parentName:"p"},"Examples"),":"))),(0,t.yg)("pre",null,(0,t.yg)("code",{parentName:"pre",className:"language-javascript"},"// save as leak-filter.js\nmodule.exports = {\n leakFilter(node, snapshot, leakedNodeIds) {\n // any unreleased node (JS heap object) with 1MB+\n // retained size is considered a memory leak\n return node.retainedSize > 1000000;\n },\n};\n")),(0,t.yg)("p",null,"Use the leak filter definition in command line interface:"),(0,t.yg)("pre",null,(0,t.yg)("code",{parentName:"pre",className:"language-bash"},"memlab find-leaks --leak-filter \n")),(0,t.yg)("pre",null,(0,t.yg)("code",{parentName:"pre",className:"language-bash"},"memlab run --scenario --leak-filter \n")),(0,t.yg)("ul",null,(0,t.yg)("li",{parentName:"ul"},(0,t.yg)("strong",{parentName:"li"},"Source"),":",(0,t.yg)("ul",{parentName:"li"},(0,t.yg)("li",{parentName:"ul"},(0,t.yg)("a",{parentName:"li",href:"https://github.com/facebook/memlab/blob/c360a62/packages/core/src/lib/Types.ts#L480"},"core/src/lib/Types.ts:480"))))),(0,t.yg)("hr",null),(0,t.yg)("h3",{id:"-optional-retainerreferencefilter-referencefiltercallback"},(0,t.yg)("a",{id:"retainerreferencefilter",name:"retainerreferencefilter"})," ",(0,t.yg)("inlineCode",{parentName:"h3"},"Optional")," ",(0,t.yg)("strong",{parentName:"h3"},"retainerReferenceFilter"),": ",(0,t.yg)("a",{parentName:"h3",href:"/memlab/docs/api/modules/core_src#referencefiltercallback"},(0,t.yg)("inlineCode",{parentName:"a"},"ReferenceFilterCallback"))),(0,t.yg)("p",null,"Callback that can be used to define a logic to decide whether\na reference should be considered as part of the retainer trace.\nThe callback is called for every reference (edge) in the heap snapshot."),(0,t.yg)("p",null,"For concrete examples, check out ",(0,t.yg)("a",{parentName:"p",href:"/memlab/docs/api/interfaces/core_src.ILeakFilter#leakfilter"},"leakFilter"),"."),(0,t.yg)("ul",null,(0,t.yg)("li",{parentName:"ul"},(0,t.yg)("p",{parentName:"li"},(0,t.yg)("strong",{parentName:"p"},"Parameters"),":"),(0,t.yg)("ul",{parentName:"li"},(0,t.yg)("li",{parentName:"ul"},(0,t.yg)("inlineCode",{parentName:"li"},"edge")," : ",(0,t.yg)("code",null,(0,t.yg)("a",{parentName:"li",href:"/memlab/docs/api/interfaces/core_src.IHeapEdge"},"IHeapEdge"))," | the reference (edge)\nthat is considered for calcualting the retainer trace"),(0,t.yg)("li",{parentName:"ul"},(0,t.yg)("inlineCode",{parentName:"li"},"snapshot"),": ",(0,t.yg)("code",null,(0,t.yg)("a",{parentName:"li",href:"/memlab/docs/api/interfaces/core_src.IHeapSnapshot"},"IHeapSnapshot"))," | the final heap\nsnapshot taken after all browser interactions are done.\nCheck out ",(0,t.yg)("a",{parentName:"li",href:"/memlab/docs/api/interfaces/core_src.IHeapSnapshot"},"IHeapSnapshot")," for more APIs that queries the\nheap snapshot."),(0,t.yg)("li",{parentName:"ul"},(0,t.yg)("inlineCode",{parentName:"li"},"isReferenceUsedByDefault"),": ",(0,t.yg)("inlineCode",{parentName:"li"},"boolean")," | MemLab has its own default\nlogic for whether a reference should be considered as part of the\nretainer trace, if this parameter is true, it means MemLab will\nconsider this reference when calculating the retainer trace."))),(0,t.yg)("li",{parentName:"ul"},(0,t.yg)("p",{parentName:"li"},(0,t.yg)("strong",{parentName:"p"},"Returns"),": the value indicating whether the given reference should be\nconsidered when calculating the retainer trace. Note that when this\ncallback returns true, the reference will only be considered as a candidate\nfor retainer trace, so it may or may not be included in the retainer trace;\nhowever, if this callback returns false, the reference will be excluded."))),(0,t.yg)("p",null,"Note that by excluding a dominator reference of an object (i.e., an edge\nthat must be traveled through to reach the heap object from GC roots),\nthe object will be considered as unreachable in the heap graph; and\ntherefore, the reference and heap object will not be included in the\nretainer trace detection and retainer size calculation."),(0,t.yg)("p",null,"Please also be aware that some edges like self-referencing edges,\nJS engine's internal edges, and hidden edges should not be considered\nas part of the retainer trace. These edges could make the retainer trace\nunncessarily complex and cause confusion. ",(0,t.yg)("inlineCode",{parentName:"p"},"isReferenceUsedByDefault")," will\nbe ",(0,t.yg)("inlineCode",{parentName:"p"},"false")," for these types of edges."),(0,t.yg)("ul",null,(0,t.yg)("li",{parentName:"ul"},(0,t.yg)("strong",{parentName:"li"},"Examples"),":")),(0,t.yg)("pre",null,(0,t.yg)("code",{parentName:"pre",className:"language-javascript"},"// save as leak-filter.js\nmodule.exports = {\n retainerReferenceFilter(edge, _snapshot, _isReferenceUsedByDefault) {\n // exclude react fiber references\n if (edge.name_or_index.toString().startsWith('__reactFiber$')) {\n return false;\n }\n // exclude other references here\n // ...\n return true;\n }\n};\n")),(0,t.yg)("p",null,"Use the leak filter definition in command line interface:"),(0,t.yg)("pre",null,(0,t.yg)("code",{parentName:"pre",className:"language-bash"},"memlab find-leaks --leak-filter \n")),(0,t.yg)("pre",null,(0,t.yg)("code",{parentName:"pre",className:"language-bash"},"memlab run --scenario --leak-filter \n")),(0,t.yg)("ul",null,(0,t.yg)("li",{parentName:"ul"},(0,t.yg)("strong",{parentName:"li"},"Source"),":",(0,t.yg)("ul",{parentName:"li"},(0,t.yg)("li",{parentName:"ul"},(0,t.yg)("a",{parentName:"li",href:"https://github.com/facebook/memlab/blob/c360a62/packages/core/src/lib/Types.ts#L543"},"core/src/lib/Types.ts:543"))))))}m.isMDXComponent=!0}}]); \ No newline at end of file +"use strict";(self.webpackChunkmemlab_website=self.webpackChunkmemlab_website||[]).push([[8485],{5680:(e,a,n)=>{n.d(a,{xA:()=>p,yg:()=>g});var r=n(6540);function t(e,a,n){return a in e?Object.defineProperty(e,a,{value:n,enumerable:!0,configurable:!0,writable:!0}):e[a]=n,e}function l(e,a){var n=Object.keys(e);if(Object.getOwnPropertySymbols){var r=Object.getOwnPropertySymbols(e);a&&(r=r.filter((function(a){return Object.getOwnPropertyDescriptor(e,a).enumerable}))),n.push.apply(n,r)}return n}function i(e){for(var a=1;a=0||(t[n]=e[n]);return t}(e,a);if(Object.getOwnPropertySymbols){var 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c=2;c{n.r(a),n.d(a,{assets:()=>s,contentTitle:()=>i,default:()=>m,frontMatter:()=>l,metadata:()=>o,toc:()=>c});var r=n(8168),t=(n(6540),n(5680));const l={id:"core_src.ILeakFilter",title:"Interface: ILeakFilter",sidebar_label:"ILeakFilter",custom_edit_url:null},i=void 0,o={unversionedId:"api/interfaces/core_src.ILeakFilter",id:"api/interfaces/core_src.ILeakFilter",title:"Interface: ILeakFilter",description:"The ILeakFilter interface allows you to define a leak detector and",source:"@site/docs/api/interfaces/core_src.ILeakFilter.md",sourceDirName:"api/interfaces",slug:"/api/interfaces/core_src.ILeakFilter",permalink:"/memlab/docs/api/interfaces/core_src.ILeakFilter",draft:!1,editUrl:null,tags:[],version:"current",frontMatter:{id:"core_src.ILeakFilter",title:"Interface: ILeakFilter",sidebar_label:"ILeakFilter",custom_edit_url:null},sidebar:"sidebar",previous:{title:"IHeapStringNode",permalink:"/memlab/docs/api/interfaces/core_src.IHeapStringNode"},next:{title:"IScenario",permalink:"/memlab/docs/api/interfaces/core_src.IScenario"}},s={},c=[{value:"Properties",id:"properties",level:2},{value:' Optional beforeLeakFilter: InitLeakFilterCallback',id:"-optional-beforeleakfilter-initleakfiltercallback",level:3},{value:' Optional leakFilter: LeakFilterCallback',id:"-optional-leakfilter-leakfiltercallback",level:3},{value:' Optional retainerReferenceFilter: ReferenceFilterCallback',id:"-optional-retainerreferencefilter-referencefiltercallback",level:3}],p={toc:c},d="wrapper";function m(e){let{components:a,...n}=e;return(0,t.yg)(d,(0,r.A)({},p,n,{components:a,mdxType:"MDXLayout"}),(0,t.yg)("p",null,"The ",(0,t.yg)("inlineCode",{parentName:"p"},"ILeakFilter")," interface allows you to define a leak detector and\ncustomize the leak filtering logic in memlab (instead of using the\nbuilt-in leak filters)."),(0,t.yg)("p",null,"Use the leak filter definition in command line interface to filter\nleaks detected from browser interactions"),(0,t.yg)("pre",null,(0,t.yg)("code",{parentName:"pre",className:"language-bash"},"memlab run --scenario --leak-filter \n")),(0,t.yg)("p",null,"If you have already run ",(0,t.yg)("inlineCode",{parentName:"p"},"memlab run")," or ",(0,t.yg)("inlineCode",{parentName:"p"},"memlab snapshot")," which saved\nheap snapshot and other meta data on disk, use the following command\nto filter leaks based on those saved heap snapshots (query the default\ndata location by ",(0,t.yg)("inlineCode",{parentName:"p"},"memlab get-default-work-dir"),")."),(0,t.yg)("pre",null,(0,t.yg)("code",{parentName:"pre",className:"language-bash"},"memlab find-leaks --leak-filter \n")),(0,t.yg)("p",null,"Here is an example TypeScript file defining a leak filter.\nThe command line interface only accepts compiled JavaScript file.\nYou can also define the leak filter in JavaScript (without the\ntype annotations."),(0,t.yg)("pre",null,(0,t.yg)("code",{parentName:"pre",className:"language-typescript"},"import {IHeapNode, IHeapSnapshot, HeapNodeIdSet, utils} from '@memlab/core';\n\nfunction initMap(snapshot: IHeapSnapshot): Record {\n const map = Object.create(null);\n snapshot.nodes.forEach(node => {\n if (node.type !== 'string') {\n return;\n }\n const str = utils.getStringNodeValue(node);\n if (str in map) {\n ++map[str];\n } else {\n map[str] = 1;\n }\n });\n return map;\n}\nconst beforeLeakFilter = (snapshot: IHeapSnapshot, _leakedNodeIds: HeapNodeIdSet): void => {\n map = initMap(snapshot);\n};\n\n// duplicated string with size > 1KB as memory leak\nconst leakFilter = (node: IHeapNode): boolean => {\n if (node.type !== 'string' || node.retainedSize < 1000) {\n return false;\n }\n const str = utils.getStringNodeValue(node);\n return map[str] > 1;\n};\n\nexport default {beforeLeakFilter, leakFilter};\n")),(0,t.yg)("h2",{id:"properties"},"Properties"),(0,t.yg)("h3",{id:"-optional-beforeleakfilter-initleakfiltercallback"},(0,t.yg)("a",{id:"beforeleakfilter",name:"beforeleakfilter"})," ",(0,t.yg)("inlineCode",{parentName:"h3"},"Optional")," ",(0,t.yg)("strong",{parentName:"h3"},"beforeLeakFilter"),": ",(0,t.yg)("a",{parentName:"h3",href:"/memlab/docs/api/modules/core_src#initleakfiltercallback"},(0,t.yg)("inlineCode",{parentName:"a"},"InitLeakFilterCallback"))),(0,t.yg)("p",null,"Lifecycle function callback that is invoked initially once before\nthe subsequent ",(0,t.yg)("inlineCode",{parentName:"p"},"leakFilter")," function calls. This callback could\nbe used to initialize some data stores or any one-off\npreprocessings."),(0,t.yg)("ul",null,(0,t.yg)("li",{parentName:"ul"},(0,t.yg)("ul",{parentName:"li"},(0,t.yg)("li",{parentName:"ul"},(0,t.yg)("strong",{parentName:"li"},"Parameters"),":"),(0,t.yg)("li",{parentName:"ul"},(0,t.yg)("inlineCode",{parentName:"li"},"snapshot"),": ",(0,t.yg)("code",null,(0,t.yg)("a",{parentName:"li",href:"/memlab/docs/api/interfaces/core_src.IHeapSnapshot"},"IHeapSnapshot"))," | the final heap\nsnapshot taken after all browser interactions are done.\nCheck out ",(0,t.yg)("a",{parentName:"li",href:"/memlab/docs/api/interfaces/core_src.IHeapSnapshot"},"IHeapSnapshot")," for more APIs that queries the\nheap snapshot."),(0,t.yg)("li",{parentName:"ul"},(0,t.yg)("inlineCode",{parentName:"li"},"leakedNodeIds"),": ",(0,t.yg)("inlineCode",{parentName:"li"},"Set")," | the set of ids of all JS heap objects\nallocated by the ",(0,t.yg)("inlineCode",{parentName:"li"},"action")," call but not released after the ",(0,t.yg)("inlineCode",{parentName:"li"},"back")," call\nin browser."))),(0,t.yg)("li",{parentName:"ul"},(0,t.yg)("p",{parentName:"li"},(0,t.yg)("strong",{parentName:"p"},"Examples"),":"))),(0,t.yg)("pre",null,(0,t.yg)("code",{parentName:"pre",className:"language-javascript"},"module.exports = {\n beforeLeakFilter: (snapshot, leakedNodeIds) {\n // initialize some data stores\n },\n leakFilter(node, snapshot, leakedNodeIds) {\n // use the data stores\n },\n};\n")),(0,t.yg)("ul",null,(0,t.yg)("li",{parentName:"ul"},(0,t.yg)("strong",{parentName:"li"},"Source"),":",(0,t.yg)("ul",{parentName:"li"},(0,t.yg)("li",{parentName:"ul"},(0,t.yg)("a",{parentName:"li",href:"https://github.com/facebook/memlab/blob/eebc764/packages/core/src/lib/Types.ts#L428"},"core/src/lib/Types.ts:428"))))),(0,t.yg)("hr",null),(0,t.yg)("h3",{id:"-optional-leakfilter-leakfiltercallback"},(0,t.yg)("a",{id:"leakfilter",name:"leakfilter"})," ",(0,t.yg)("inlineCode",{parentName:"h3"},"Optional")," ",(0,t.yg)("strong",{parentName:"h3"},"leakFilter"),": ",(0,t.yg)("a",{parentName:"h3",href:"/memlab/docs/api/modules/core_src#leakfiltercallback"},(0,t.yg)("inlineCode",{parentName:"a"},"LeakFilterCallback"))),(0,t.yg)("p",null,"This callback defines how you want to filter out the\nleaked objects. The callback is called for every node (JS heap\nobject in browser) allocated by the ",(0,t.yg)("inlineCode",{parentName:"p"},"action")," callback, but not\nreleased after the ",(0,t.yg)("inlineCode",{parentName:"p"},"back")," callback. Those objects could be caches\nthat are retained in memory on purpose, or they are memory leaks."),(0,t.yg)("p",null,"This optional callback allows you to define your own algorithm\nto cherry pick memory leaks for specific JS program under test."),(0,t.yg)("p",null,"If this optional callback is not defined, memlab will use its\nbuilt-in leak filter, which considers detached DOM elements\nand unmounted Fiber nodes (detached from React Fiber tree) as\nmemory leaks."),(0,t.yg)("ul",null,(0,t.yg)("li",{parentName:"ul"},(0,t.yg)("p",{parentName:"li"},(0,t.yg)("strong",{parentName:"p"},"Parameters"),":"),(0,t.yg)("ul",{parentName:"li"},(0,t.yg)("li",{parentName:"ul"},(0,t.yg)("inlineCode",{parentName:"li"},"node"),": ",(0,t.yg)("code",null,(0,t.yg)("a",{parentName:"li",href:"/memlab/docs/api/interfaces/core_src.IHeapNode"},"IHeapNode"))," | the heap object\nallocated but not released. This filter callback will be applied\nto each node allocated but not released in the heap snapshot."),(0,t.yg)("li",{parentName:"ul"},(0,t.yg)("inlineCode",{parentName:"li"},"snapshot"),": ",(0,t.yg)("code",null,(0,t.yg)("a",{parentName:"li",href:"/memlab/docs/api/interfaces/core_src.IHeapSnapshot"},"IHeapSnapshot"))," | the final heap\nsnapshot taken after all browser interactions are done.\nCheck out ",(0,t.yg)("a",{parentName:"li",href:"/memlab/docs/api/interfaces/core_src.IHeapSnapshot"},"IHeapSnapshot")," for more APIs that queries the\nheap snapshot."),(0,t.yg)("li",{parentName:"ul"},(0,t.yg)("inlineCode",{parentName:"li"},"leakedNodeIds"),": ",(0,t.yg)("inlineCode",{parentName:"li"},"Set")," | the set of ids of all JS heap objects\nallocated by the ",(0,t.yg)("inlineCode",{parentName:"li"},"action")," call but not released after the ",(0,t.yg)("inlineCode",{parentName:"li"},"back")," call\nin browser."))),(0,t.yg)("li",{parentName:"ul"},(0,t.yg)("p",{parentName:"li"},(0,t.yg)("strong",{parentName:"p"},"Returns"),": the boolean value indicating whether the given node in\nthe snapshot should be considered as leaked.")),(0,t.yg)("li",{parentName:"ul"},(0,t.yg)("p",{parentName:"li"},(0,t.yg)("strong",{parentName:"p"},"Examples"),":"))),(0,t.yg)("pre",null,(0,t.yg)("code",{parentName:"pre",className:"language-javascript"},"// save as leak-filter.js\nmodule.exports = {\n leakFilter(node, snapshot, leakedNodeIds) {\n // any unreleased node (JS heap object) with 1MB+\n // retained size is considered a memory leak\n return node.retainedSize > 1000000;\n },\n};\n")),(0,t.yg)("p",null,"Use the leak filter definition in command line interface:"),(0,t.yg)("pre",null,(0,t.yg)("code",{parentName:"pre",className:"language-bash"},"memlab find-leaks --leak-filter \n")),(0,t.yg)("pre",null,(0,t.yg)("code",{parentName:"pre",className:"language-bash"},"memlab run --scenario --leak-filter \n")),(0,t.yg)("ul",null,(0,t.yg)("li",{parentName:"ul"},(0,t.yg)("strong",{parentName:"li"},"Source"),":",(0,t.yg)("ul",{parentName:"li"},(0,t.yg)("li",{parentName:"ul"},(0,t.yg)("a",{parentName:"li",href:"https://github.com/facebook/memlab/blob/eebc764/packages/core/src/lib/Types.ts#L480"},"core/src/lib/Types.ts:480"))))),(0,t.yg)("hr",null),(0,t.yg)("h3",{id:"-optional-retainerreferencefilter-referencefiltercallback"},(0,t.yg)("a",{id:"retainerreferencefilter",name:"retainerreferencefilter"})," ",(0,t.yg)("inlineCode",{parentName:"h3"},"Optional")," ",(0,t.yg)("strong",{parentName:"h3"},"retainerReferenceFilter"),": ",(0,t.yg)("a",{parentName:"h3",href:"/memlab/docs/api/modules/core_src#referencefiltercallback"},(0,t.yg)("inlineCode",{parentName:"a"},"ReferenceFilterCallback"))),(0,t.yg)("p",null,"Callback that can be used to define a logic to decide whether\na reference should be considered as part of the retainer trace.\nThe callback is called for every reference (edge) in the heap snapshot."),(0,t.yg)("p",null,"For concrete examples, check out ",(0,t.yg)("a",{parentName:"p",href:"/memlab/docs/api/interfaces/core_src.ILeakFilter#leakfilter"},"leakFilter"),"."),(0,t.yg)("ul",null,(0,t.yg)("li",{parentName:"ul"},(0,t.yg)("p",{parentName:"li"},(0,t.yg)("strong",{parentName:"p"},"Parameters"),":"),(0,t.yg)("ul",{parentName:"li"},(0,t.yg)("li",{parentName:"ul"},(0,t.yg)("inlineCode",{parentName:"li"},"edge")," : ",(0,t.yg)("code",null,(0,t.yg)("a",{parentName:"li",href:"/memlab/docs/api/interfaces/core_src.IHeapEdge"},"IHeapEdge"))," | the reference (edge)\nthat is considered for calcualting the retainer trace"),(0,t.yg)("li",{parentName:"ul"},(0,t.yg)("inlineCode",{parentName:"li"},"snapshot"),": ",(0,t.yg)("code",null,(0,t.yg)("a",{parentName:"li",href:"/memlab/docs/api/interfaces/core_src.IHeapSnapshot"},"IHeapSnapshot"))," | the final heap\nsnapshot taken after all browser interactions are done.\nCheck out ",(0,t.yg)("a",{parentName:"li",href:"/memlab/docs/api/interfaces/core_src.IHeapSnapshot"},"IHeapSnapshot")," for more APIs that queries the\nheap snapshot."),(0,t.yg)("li",{parentName:"ul"},(0,t.yg)("inlineCode",{parentName:"li"},"isReferenceUsedByDefault"),": ",(0,t.yg)("inlineCode",{parentName:"li"},"boolean")," | MemLab has its own default\nlogic for whether a reference should be considered as part of the\nretainer trace, if this parameter is true, it means MemLab will\nconsider this reference when calculating the retainer trace."))),(0,t.yg)("li",{parentName:"ul"},(0,t.yg)("p",{parentName:"li"},(0,t.yg)("strong",{parentName:"p"},"Returns"),": the value indicating whether the given reference should be\nconsidered when calculating the retainer trace. Note that when this\ncallback returns true, the reference will only be considered as a candidate\nfor retainer trace, so it may or may not be included in the retainer trace;\nhowever, if this callback returns false, the reference will be excluded."))),(0,t.yg)("p",null,"Note that by excluding a dominator reference of an object (i.e., an edge\nthat must be traveled through to reach the heap object from GC roots),\nthe object will be considered as unreachable in the heap graph; and\ntherefore, the reference and heap object will not be included in the\nretainer trace detection and retainer size calculation."),(0,t.yg)("p",null,"Please also be aware that some edges like self-referencing edges,\nJS engine's internal edges, and hidden edges should not be considered\nas part of the retainer trace. These edges could make the retainer trace\nunncessarily complex and cause confusion. 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// should be 351\n})();\n")),(0,r.yg)("ul",null,(0,r.yg)("li",{parentName:"ul"},(0,r.yg)("strong",{parentName:"li"},"Source"),":",(0,r.yg)("ul",{parentName:"li"},(0,r.yg)("li",{parentName:"ul"},(0,r.yg)("a",{parentName:"li",href:"https://github.com/facebook/memlab/blob/c360a62/packages/core/src/lib/Types.ts#L1354"},"core/src/lib/Types.ts:1354"))))),(0,r.yg)("hr",null),(0,r.yg)("h3",{id:"getnodesbyidsetids"},(0,r.yg)("a",{id:"getnodesbyidset"}),(0,r.yg)("strong",{parentName:"h3"},"getNodesByIdSet"),"(",(0,r.yg)("inlineCode",{parentName:"h3"},"ids"),")"),(0,r.yg)("p",null,"Given a set of ids of heap nodes (JS objects in heap), use this API\nto get a set of those heap nodes."),(0,r.yg)("ul",null,(0,r.yg)("li",{parentName:"ul"},(0,r.yg)("p",{parentName:"li"},(0,r.yg)("strong",{parentName:"p"},"Parameters"),":"),(0,r.yg)("ul",{parentName:"li"},(0,r.yg)("li",{parentName:"ul"},(0,r.yg)("inlineCode",{parentName:"li"},"ids"),": ",(0,r.yg)("inlineCode",{parentName:"li"},"Set"),"<",(0,r.yg)("inlineCode",{parentName:"li"},"number"),">"," | id set of the heap nodes (JS objects in heap) you would like to query"))),(0,r.yg)("li",{parentName:"ul"},(0,r.yg)("p",{parentName:"li"},(0,r.yg)("strong",{parentName:"p"},"Returns"),": ",(0,r.yg)("inlineCode",{parentName:"p"},"Set"),"<",(0,r.yg)("a",{parentName:"p",href:"/memlab/docs/api/interfaces/core_src.IHeapNode"},(0,r.yg)("inlineCode",{parentName:"a"},"IHeapNode")),">"," | a set of those heap nodes. The set will only include\nnodes that are found in the heap. If none of the input ids are found,\nthis API will return an empty set.")),(0,r.yg)("li",{parentName:"ul"},(0,r.yg)("p",{parentName:"li"},(0,r.yg)("strong",{parentName:"p"},"Examples"),":"))),(0,r.yg)("pre",null,(0,r.yg)("code",{parentName:"pre",className:"language-typescript"},"import type {IHeapSnapshot} from '@memlab/core';\nimport {dumpNodeHeapSnapshot} from '@memlab/core';\nimport {getFullHeapFromFile} from '@memlab/heap-analysis';\n\n(async function () {\n const heapFile = dumpNodeHeapSnapshot();\n const heap: IHeapSnapshot = await getFullHeapFromFile(heapFile);\n\n // suppose 1000 is not a valid id in the heap\n const set = heap.getNodesByIdSet(new Set([1, 2, 1000, 3]));\n set // should be Set([node1, node2, node3])\n})();\n")),(0,r.yg)("ul",null,(0,r.yg)("li",{parentName:"ul"},(0,r.yg)("strong",{parentName:"li"},"Source"),":",(0,r.yg)("ul",{parentName:"li"},(0,r.yg)("li",{parentName:"ul"},(0,r.yg)("a",{parentName:"li",href:"https://github.com/facebook/memlab/blob/c360a62/packages/core/src/lib/Types.ts#L1406"},"core/src/lib/Types.ts:1406"))))),(0,r.yg)("hr",null),(0,r.yg)("h3",{id:"getnodesbyidsids"},(0,r.yg)("a",{id:"getnodesbyids"}),(0,r.yg)("strong",{parentName:"h3"},"getNodesByIds"),"(",(0,r.yg)("inlineCode",{parentName:"h3"},"ids"),")"),(0,r.yg)("p",null,"Given an array of ids of heap nodes (JS objects in heap), use this API\nto get an array of those heap nodes."),(0,r.yg)("ul",null,(0,r.yg)("li",{parentName:"ul"},(0,r.yg)("p",{parentName:"li"},(0,r.yg)("strong",{parentName:"p"},"Parameters"),":"),(0,r.yg)("ul",{parentName:"li"},(0,r.yg)("li",{parentName:"ul"},(0,r.yg)("inlineCode",{parentName:"li"},"ids"),": ",(0,r.yg)("inlineCode",{parentName:"li"},"number"),"[] | id array of the heap nodes (JS objects in heap) you would like to query"))),(0,r.yg)("li",{parentName:"ul"},(0,r.yg)("p",{parentName:"li"},(0,r.yg)("strong",{parentName:"p"},"Returns"),": ",(0,r.yg)("a",{parentName:"p",href:"/memlab/docs/api/modules/core_src#nullable"},(0,r.yg)("inlineCode",{parentName:"a"},"Nullable")),"<",(0,r.yg)("a",{parentName:"p",href:"/memlab/docs/api/interfaces/core_src.IHeapNode"},(0,r.yg)("inlineCode",{parentName:"a"},"IHeapNode")),">","[] | an array of those heap nodes. The return array will preserve the\norder of the input array. If an id is not found in the heap, the\ncorresponding element in the return array will be ",(0,r.yg)("inlineCode",{parentName:"p"},"null"),".")),(0,r.yg)("li",{parentName:"ul"},(0,r.yg)("p",{parentName:"li"},(0,r.yg)("strong",{parentName:"p"},"Examples"),":"))),(0,r.yg)("pre",null,(0,r.yg)("code",{parentName:"pre",className:"language-typescript"},"import type {IHeapSnapshot} from '@memlab/core';\nimport {dumpNodeHeapSnapshot} from '@memlab/core';\nimport {getFullHeapFromFile} from '@memlab/heap-analysis';\n\n(async function () {\n const heapFile = dumpNodeHeapSnapshot();\n const heap: IHeapSnapshot = await getFullHeapFromFile(heapFile);\n\n // suppose 1000 is not a valid id in the heap\n const nodes = heap.getNodesByIds([1, 2, 1000, 3]);\n nodes // should be [node1, node2, null, node3]\n})();\n")),(0,r.yg)("ul",null,(0,r.yg)("li",{parentName:"ul"},(0,r.yg)("strong",{parentName:"li"},"Source"),":",(0,r.yg)("ul",{parentName:"li"},(0,r.yg)("li",{parentName:"ul"},(0,r.yg)("a",{parentName:"li",href:"https://github.com/facebook/memlab/blob/c360a62/packages/core/src/lib/Types.ts#L1380"},"core/src/lib/Types.ts:1380"))))),(0,r.yg)("hr",null),(0,r.yg)("h3",{id:"hasobjectwithclassnameclassname"},(0,r.yg)("a",{id:"hasobjectwithclassname"}),(0,r.yg)("strong",{parentName:"h3"},"hasObjectWithClassName"),"(",(0,r.yg)("inlineCode",{parentName:"h3"},"className"),")"),(0,r.yg)("p",null,"Search for the heap and check if there is any JS object instance with\na specified constructor name."),(0,r.yg)("ul",null,(0,r.yg)("li",{parentName:"ul"},(0,r.yg)("p",{parentName:"li"},(0,r.yg)("strong",{parentName:"p"},"Parameters"),":"),(0,r.yg)("ul",{parentName:"li"},(0,r.yg)("li",{parentName:"ul"},(0,r.yg)("inlineCode",{parentName:"li"},"className"),": ",(0,r.yg)("inlineCode",{parentName:"li"},"string")," | The constructor name of the object instance"))),(0,r.yg)("li",{parentName:"ul"},(0,r.yg)("p",{parentName:"li"},(0,r.yg)("strong",{parentName:"p"},"Returns"),": ",(0,r.yg)("inlineCode",{parentName:"p"},"boolean")," | ",(0,r.yg)("inlineCode",{parentName:"p"},"true")," if there is at least one such object in the heap")),(0,r.yg)("li",{parentName:"ul"},(0,r.yg)("p",{parentName:"li"},(0,r.yg)("strong",{parentName:"p"},"Examples"),": you can write a jest unit test with memory assertions:"))),(0,r.yg)("pre",null,(0,r.yg)("code",{parentName:"pre",className:"language-typescript"},"// save as example.test.ts\nimport type {IHeapSnapshot, Nullable} from '@memlab/core';\nimport {config, takeNodeMinimalHeap} from '@memlab/core';\n\nclass TestObject {\n public arr1 = [1, 2, 3];\n public arr2 = ['1', '2', '3'];\n}\n\ntest('memory test with heap assertion', async () => {\n config.muteConsole = true; // no console output\n\n let obj: Nullable = new TestObject();\n // get a heap snapshot of the current program state\n let heap: IHeapSnapshot = await takeNodeMinimalHeap();\n\n // call some function that may add references to obj\n rabbitHole(obj)\n\n expect(heap.hasObjectWithClassName('TestObject')).toBe(true);\n obj = null;\n\n heap = await takeNodeMinimalHeap();\n // if rabbitHole does not have any side effect that\n // adds new references to obj, then obj can be GCed\n expect(heap.hasObjectWithClassName('TestObject')).toBe(false);\n\n}, 30000);\n")),(0,r.yg)("ul",null,(0,r.yg)("li",{parentName:"ul"},(0,r.yg)("strong",{parentName:"li"},"Source"),":",(0,r.yg)("ul",{parentName:"li"},(0,r.yg)("li",{parentName:"ul"},(0,r.yg)("a",{parentName:"li",href:"https://github.com/facebook/memlab/blob/c360a62/packages/core/src/lib/Types.ts#L1445"},"core/src/lib/Types.ts:1445"))))),(0,r.yg)("hr",null),(0,r.yg)("h3",{id:"hasobjectwithpropertynamenameorindex"},(0,r.yg)("a",{id:"hasobjectwithpropertyname"}),(0,r.yg)("strong",{parentName:"h3"},"hasObjectWithPropertyName"),"(",(0,r.yg)("inlineCode",{parentName:"h3"},"nameOrIndex"),")"),(0,r.yg)("p",null,"Search for the heap and check if there is any JS object instance with\na specified property name."),(0,r.yg)("ul",null,(0,r.yg)("li",{parentName:"ul"},(0,r.yg)("p",{parentName:"li"},(0,r.yg)("strong",{parentName:"p"},"Parameters"),":"),(0,r.yg)("ul",{parentName:"li"},(0,r.yg)("li",{parentName:"ul"},(0,r.yg)("inlineCode",{parentName:"li"},"nameOrIndex"),": ",(0,r.yg)("inlineCode",{parentName:"li"},"string")," ","|"," ",(0,r.yg)("inlineCode",{parentName:"li"},"number")," | The property name (string) or element index (number) on the object instance"))),(0,r.yg)("li",{parentName:"ul"},(0,r.yg)("p",{parentName:"li"},(0,r.yg)("strong",{parentName:"p"},"Returns"),": ",(0,r.yg)("inlineCode",{parentName:"p"},"boolean")," | returns ",(0,r.yg)("inlineCode",{parentName:"p"},"true")," if there is at least one such object in the heap")),(0,r.yg)("li",{parentName:"ul"},(0,r.yg)("p",{parentName:"li"},(0,r.yg)("strong",{parentName:"p"},"Examples"),":"))),(0,r.yg)("pre",null,(0,r.yg)("code",{parentName:"pre",className:"language-typescript"},"import type {IHeapSnapshot} from '@memlab/core';\nimport {dumpNodeHeapSnapshot} from '@memlab/core';\nimport {getFullHeapFromFile} from '@memlab/heap-analysis';\n\n(async function () {\n // eslint-disable-next-line @typescript-eslint/no-unused-vars\n const object = {'memlab-test-heap-property': 'memlab-test-heap-value'};\n\n const heapFile = dumpNodeHeapSnapshot();\n const heap: IHeapSnapshot = await getFullHeapFromFile(heapFile);\n\n // should be true\n console.log(heap.hasObjectWithPropertyName('memlab-test-heap-property'));\n})();\n")),(0,r.yg)("ul",null,(0,r.yg)("li",{parentName:"ul"},(0,r.yg)("strong",{parentName:"li"},"Source"),":",(0,r.yg)("ul",{parentName:"li"},(0,r.yg)("li",{parentName:"ul"},(0,r.yg)("a",{parentName:"li",href:"https://github.com/facebook/memlab/blob/c360a62/packages/core/src/lib/Types.ts#L1499"},"core/src/lib/Types.ts:1499"))))),(0,r.yg)("hr",null),(0,r.yg)("h3",{id:"hasobjectwithtagtag"},(0,r.yg)("a",{id:"hasobjectwithtag"}),(0,r.yg)("strong",{parentName:"h3"},"hasObjectWithTag"),"(",(0,r.yg)("inlineCode",{parentName:"h3"},"tag"),")"),(0,r.yg)("p",null,"Search for the heap and check if there is any JS object instance with\na marker tagged by ",(0,r.yg)("a",{parentName:"p",href:"/memlab/docs/api/modules/core_src#tagobject"},"tagObject"),"."),(0,r.yg)("p",null,"The ",(0,r.yg)("inlineCode",{parentName:"p"},"tagObject")," API does not modify the object instance in any way\n(e.g., no additional or hidden properties added to the tagged object)."),(0,r.yg)("ul",null,(0,r.yg)("li",{parentName:"ul"},(0,r.yg)("strong",{parentName:"li"},"Parameters"),":",(0,r.yg)("ul",{parentName:"li"},(0,r.yg)("li",{parentName:"ul"},(0,r.yg)("inlineCode",{parentName:"li"},"tag"),": ",(0,r.yg)("inlineCode",{parentName:"li"},"string")," | marker name on the object instances tagged by ",(0,r.yg)("a",{parentName:"li",href:"/memlab/docs/api/modules/core_src#tagobject"},"tagObject")))),(0,r.yg)("li",{parentName:"ul"},(0,r.yg)("strong",{parentName:"li"},"Returns"),": ",(0,r.yg)("inlineCode",{parentName:"li"},"boolean")," | returns ",(0,r.yg)("inlineCode",{parentName:"li"},"true")," if there is at least one such object in the heap")),(0,r.yg)("pre",null,(0,r.yg)("code",{parentName:"pre",className:"language-typescript"},"import type {IHeapSnapshot, AnyValue} from '@memlab/core';\nimport {config, takeNodeMinimalHeap, tagObject} from '@memlab/core';\n\ntest('memory test', async () => {\n config.muteConsole = true;\n const o1: AnyValue = {};\n let o2: AnyValue = {};\n\n // tag o1 with marker: \"memlab-mark-1\", does not modify o1 in any way\n tagObject(o1, 'memlab-mark-1');\n // tag o2 with marker: \"memlab-mark-2\", does not modify o2 in any way\n tagObject(o2, 'memlab-mark-2');\n\n o2 = null;\n\n const heap: IHeapSnapshot = await takeNodeMinimalHeap();\n\n // expect object with marker \"memlab-mark-1\" exists\n expect(heap.hasObjectWithTag('memlab-mark-1')).toBe(true);\n\n // expect object with marker \"memlab-mark-2\" can be GCed\n expect(heap.hasObjectWithTag('memlab-mark-2')).toBe(false);\n\n}, 30000);\n")),(0,r.yg)("ul",null,(0,r.yg)("li",{parentName:"ul"},(0,r.yg)("strong",{parentName:"li"},"Source"),":",(0,r.yg)("ul",{parentName:"li"},(0,r.yg)("li",{parentName:"ul"},(0,r.yg)("a",{parentName:"li",href:"https://github.com/facebook/memlab/blob/c360a62/packages/core/src/lib/Types.ts#L1537"},"core/src/lib/Types.ts:1537"))))))}g.isMDXComponent=!0}}]); \ No newline at end of file +"use strict";(self.webpackChunkmemlab_website=self.webpackChunkmemlab_website||[]).push([[1456],{5680:(e,a,n)=>{n.d(a,{xA:()=>m,yg:()=>d});var t=n(6540);function r(e,a,n){return a in e?Object.defineProperty(e,a,{value:n,enumerable:!0,configurable:!0,writable:!0}):e[a]=n,e}function o(e,a){var n=Object.keys(e);if(Object.getOwnPropertySymbols){var t=Object.getOwnPropertySymbols(e);a&&(t=t.filter((function(a){return Object.getOwnPropertyDescriptor(e,a).enumerable}))),n.push.apply(n,t)}return n}function l(e){for(var a=1;a=0||(r[n]=e[n]);return r}(e,a);if(Object.getOwnPropertySymbols){var 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i=2;i{n.r(a),n.d(a,{assets:()=>s,contentTitle:()=>l,default:()=>g,frontMatter:()=>o,metadata:()=>p,toc:()=>i});var t=n(8168),r=(n(6540),n(5680));const o={id:"core_src.IHeapSnapshot",title:"Interface: IHeapSnapshot",sidebar_label:"IHeapSnapshot",custom_edit_url:null},l=void 0,p={unversionedId:"api/interfaces/core_src.IHeapSnapshot",id:"api/interfaces/core_src.IHeapSnapshot",title:"Interface: IHeapSnapshot",description:"A heap snapshot is generally a graph where graph nodes are JS heap objects",source:"@site/docs/api/interfaces/core_src.IHeapSnapshot.md",sourceDirName:"api/interfaces",slug:"/api/interfaces/core_src.IHeapSnapshot",permalink:"/memlab/docs/api/interfaces/core_src.IHeapSnapshot",draft:!1,editUrl:null,tags:[],version:"current",frontMatter:{id:"core_src.IHeapSnapshot",title:"Interface: 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IHeapNodes',id:"-nodes-iheapnodes",level:3},{value:"Methods",id:"methods",level:2},{value:'getAnyObjectWithClassName(className)',id:"getanyobjectwithclassnameclassname",level:3},{value:'getNodeById(id)',id:"getnodebyidid",level:3},{value:'getNodesByIdSet(ids)',id:"getnodesbyidsetids",level:3},{value:'getNodesByIds(ids)',id:"getnodesbyidsids",level:3},{value:'hasObjectWithClassName(className)',id:"hasobjectwithclassnameclassname",level:3},{value:'hasObjectWithPropertyName(nameOrIndex)',id:"hasobjectwithpropertynamenameorindex",level:3},{value:'hasObjectWithTag(tag)',id:"hasobjectwithtagtag",level:3}],m={toc:i},c="wrapper";function g(e){let{components:a,...n}=e;return(0,r.yg)(c,(0,t.A)({},m,n,{components:a,mdxType:"MDXLayout"}),(0,r.yg)("p",null,"A heap snapshot is generally a graph where graph nodes are JS heap objects\nand graph edges are JS references among JS heap objects. For more details\non the structure of nodes and edges in the heap graph, check out\n",(0,r.yg)("a",{parentName:"p",href:"/memlab/docs/api/interfaces/core_src.IHeapNode"},"IHeapNode")," and ",(0,r.yg)("a",{parentName:"p",href:"/memlab/docs/api/interfaces/core_src.IHeapEdge"},"IHeapEdge"),"."),(0,r.yg)("h2",{id:"properties"},"Properties"),(0,r.yg)("h3",{id:"-edges-iheapedges"},(0,r.yg)("a",{id:"edges",name:"edges"})," ",(0,r.yg)("strong",{parentName:"h3"},"edges"),": ",(0,r.yg)("a",{parentName:"h3",href:"/memlab/docs/api/interfaces/core_src.IHeapEdges"},(0,r.yg)("inlineCode",{parentName:"a"},"IHeapEdges"))),(0,r.yg)("p",null,"A pseudo array containing all heap graph edges (references to heap objects\nin heap). A JS heap could contain millions of references, so memlab uses\na pseudo array as the collection of all the heap edges. The pseudo\narray provides API to query and traverse all heap references."),(0,r.yg)("ul",null,(0,r.yg)("li",{parentName:"ul"},(0,r.yg)("strong",{parentName:"li"},"Examples"),":")),(0,r.yg)("pre",null,(0,r.yg)("code",{parentName:"pre",className:"language-typescript"},"import type {IHeapSnapshot, IHeapEdge} from '@memlab/core';\nimport {dumpNodeHeapSnapshot} from '@memlab/core';\nimport {getFullHeapFromFile} from '@memlab/heap-analysis';\n\n(async function () {\n const heapFile = dumpNodeHeapSnapshot();\n const heap: IHeapSnapshot = await getFullHeapFromFile(heapFile);\n\n // get the total number of heap references\n heap.edges.length;\n\n heap.edges.forEach((edge: IHeapEdge) => {\n // traverse each reference in the heap\n });\n})();\n")),(0,r.yg)("ul",null,(0,r.yg)("li",{parentName:"ul"},(0,r.yg)("strong",{parentName:"li"},"Source"),":",(0,r.yg)("ul",{parentName:"li"},(0,r.yg)("li",{parentName:"ul"},(0,r.yg)("a",{parentName:"li",href:"https://github.com/facebook/memlab/blob/eebc764/packages/core/src/lib/Types.ts#L1332"},"core/src/lib/Types.ts:1332"))))),(0,r.yg)("hr",null),(0,r.yg)("h3",{id:"-nodes-iheapnodes"},(0,r.yg)("a",{id:"nodes",name:"nodes"})," ",(0,r.yg)("strong",{parentName:"h3"},"nodes"),": ",(0,r.yg)("a",{parentName:"h3",href:"/memlab/docs/api/interfaces/core_src.IHeapNodes"},(0,r.yg)("inlineCode",{parentName:"a"},"IHeapNodes"))),(0,r.yg)("p",null,"A pseudo array containing all heap graph nodes (JS objects in heap).\nA JS heap could contain millions of heap objects, so memlab uses\na pseudo array as the collection of all the heap objects. The pseudo\narray provides API to query and traverse all heap objects."),(0,r.yg)("ul",null,(0,r.yg)("li",{parentName:"ul"},(0,r.yg)("strong",{parentName:"li"},"Examples"),":")),(0,r.yg)("pre",null,(0,r.yg)("code",{parentName:"pre",className:"language-typescript"},"import type {IHeapSnapshot, IHeapNode} from '@memlab/core';\nimport {dumpNodeHeapSnapshot} from '@memlab/core';\nimport {getFullHeapFromFile} from '@memlab/heap-analysis';\n\n(async function () {\n const heapFile = dumpNodeHeapSnapshot();\n const heap: IHeapSnapshot = await getFullHeapFromFile(heapFile);\n\n // get the total number of heap objects\n heap.nodes.length;\n\n heap.nodes.forEach((node: IHeapNode) => {\n // traverse each heap object\n });\n})();\n")),(0,r.yg)("ul",null,(0,r.yg)("li",{parentName:"ul"},(0,r.yg)("strong",{parentName:"li"},"Source"),":",(0,r.yg)("ul",{parentName:"li"},(0,r.yg)("li",{parentName:"ul"},(0,r.yg)("a",{parentName:"li",href:"https://github.com/facebook/memlab/blob/eebc764/packages/core/src/lib/Types.ts#L1306"},"core/src/lib/Types.ts:1306"))))),(0,r.yg)("h2",{id:"methods"},"Methods"),(0,r.yg)("h3",{id:"getanyobjectwithclassnameclassname"},(0,r.yg)("a",{id:"getanyobjectwithclassname"}),(0,r.yg)("strong",{parentName:"h3"},"getAnyObjectWithClassName"),"(",(0,r.yg)("inlineCode",{parentName:"h3"},"className"),")"),(0,r.yg)("p",null,"Search for the heap and get one of the JS object instances with\na specified constructor name (if there is any)."),(0,r.yg)("ul",null,(0,r.yg)("li",{parentName:"ul"},(0,r.yg)("p",{parentName:"li"},(0,r.yg)("strong",{parentName:"p"},"Parameters"),":"),(0,r.yg)("ul",{parentName:"li"},(0,r.yg)("li",{parentName:"ul"},(0,r.yg)("inlineCode",{parentName:"li"},"className"),": ",(0,r.yg)("inlineCode",{parentName:"li"},"string")," | The constructor name of the object instance"))),(0,r.yg)("li",{parentName:"ul"},(0,r.yg)("p",{parentName:"li"},(0,r.yg)("strong",{parentName:"p"},"Returns"),": ",(0,r.yg)("a",{parentName:"p",href:"/memlab/docs/api/modules/core_src#nullable"},(0,r.yg)("inlineCode",{parentName:"a"},"Nullable")),"<",(0,r.yg)("a",{parentName:"p",href:"/memlab/docs/api/interfaces/core_src.IHeapNode"},(0,r.yg)("inlineCode",{parentName:"a"},"IHeapNode")),">"," | a handle pointing to any one of the object instances, returns\n",(0,r.yg)("inlineCode",{parentName:"p"},"null")," if no such object exists in the heap.")),(0,r.yg)("li",{parentName:"ul"},(0,r.yg)("p",{parentName:"li"},(0,r.yg)("strong",{parentName:"p"},"Examples"),":"))),(0,r.yg)("pre",null,(0,r.yg)("code",{parentName:"pre",className:"language-typescript"},"import type {IHeapSnapshot} from '@memlab/core';\nimport {takeNodeMinimalHeap} from '@memlab/core';\n\nclass TestObject {\n public arr1 = [1, 2, 3];\n public arr2 = ['1', '2', '3'];\n}\n\n(async function () {\n const obj = new TestObject();\n // get a heap snapshot of the current program state\n const heap: IHeapSnapshot = await takeNodeMinimalHeap();\n\n const node = heap.getAnyObjectWithClassName('TestObject');\n console.log(node?.name); // should be 'TestObject'\n})();\n")),(0,r.yg)("ul",null,(0,r.yg)("li",{parentName:"ul"},(0,r.yg)("strong",{parentName:"li"},"Source"),":",(0,r.yg)("ul",{parentName:"li"},(0,r.yg)("li",{parentName:"ul"},(0,r.yg)("a",{parentName:"li",href:"https://github.com/facebook/memlab/blob/eebc764/packages/core/src/lib/Types.ts#L1473"},"core/src/lib/Types.ts:1473"))))),(0,r.yg)("hr",null),(0,r.yg)("h3",{id:"getnodebyidid"},(0,r.yg)("a",{id:"getnodebyid"}),(0,r.yg)("strong",{parentName:"h3"},"getNodeById"),"(",(0,r.yg)("inlineCode",{parentName:"h3"},"id"),")"),(0,r.yg)("p",null,"If you have the id of a heap node (JS object in heap), use this API\nto get an ",(0,r.yg)("a",{parentName:"p",href:"/memlab/docs/api/interfaces/core_src.IHeapNode"},"IHeapNode")," associated with the id."),(0,r.yg)("ul",null,(0,r.yg)("li",{parentName:"ul"},(0,r.yg)("p",{parentName:"li"},(0,r.yg)("strong",{parentName:"p"},"Parameters"),":"),(0,r.yg)("ul",{parentName:"li"},(0,r.yg)("li",{parentName:"ul"},(0,r.yg)("inlineCode",{parentName:"li"},"id"),": ",(0,r.yg)("inlineCode",{parentName:"li"},"number")," | id of the heap node (JS object in heap) you would like to query"))),(0,r.yg)("li",{parentName:"ul"},(0,r.yg)("p",{parentName:"li"},(0,r.yg)("strong",{parentName:"p"},"Returns"),": ",(0,r.yg)("a",{parentName:"p",href:"/memlab/docs/api/modules/core_src#nullable"},(0,r.yg)("inlineCode",{parentName:"a"},"Nullable")),"<",(0,r.yg)("a",{parentName:"p",href:"/memlab/docs/api/interfaces/core_src.IHeapNode"},(0,r.yg)("inlineCode",{parentName:"a"},"IHeapNode")),">"," | the API returns ",(0,r.yg)("inlineCode",{parentName:"p"},"null")," if no heap object has the specified id.")),(0,r.yg)("li",{parentName:"ul"},(0,r.yg)("p",{parentName:"li"},(0,r.yg)("strong",{parentName:"p"},"Examples"),":"))),(0,r.yg)("pre",null,(0,r.yg)("code",{parentName:"pre",className:"language-typescript"},"import type {IHeapSnapshot} from '@memlab/core';\nimport {dumpNodeHeapSnapshot} from '@memlab/core';\nimport {getFullHeapFromFile} from '@memlab/heap-analysis';\n\n(async function () {\n const heapFile = dumpNodeHeapSnapshot();\n const heap: IHeapSnapshot = await getFullHeapFromFile(heapFile);\n\n const node = heap.getNodeById(351);\n node?.id; // should be 351\n})();\n")),(0,r.yg)("ul",null,(0,r.yg)("li",{parentName:"ul"},(0,r.yg)("strong",{parentName:"li"},"Source"),":",(0,r.yg)("ul",{parentName:"li"},(0,r.yg)("li",{parentName:"ul"},(0,r.yg)("a",{parentName:"li",href:"https://github.com/facebook/memlab/blob/eebc764/packages/core/src/lib/Types.ts#L1354"},"core/src/lib/Types.ts:1354"))))),(0,r.yg)("hr",null),(0,r.yg)("h3",{id:"getnodesbyidsetids"},(0,r.yg)("a",{id:"getnodesbyidset"}),(0,r.yg)("strong",{parentName:"h3"},"getNodesByIdSet"),"(",(0,r.yg)("inlineCode",{parentName:"h3"},"ids"),")"),(0,r.yg)("p",null,"Given a set of ids of heap nodes (JS objects in heap), use this API\nto get a set of those heap nodes."),(0,r.yg)("ul",null,(0,r.yg)("li",{parentName:"ul"},(0,r.yg)("p",{parentName:"li"},(0,r.yg)("strong",{parentName:"p"},"Parameters"),":"),(0,r.yg)("ul",{parentName:"li"},(0,r.yg)("li",{parentName:"ul"},(0,r.yg)("inlineCode",{parentName:"li"},"ids"),": ",(0,r.yg)("inlineCode",{parentName:"li"},"Set"),"<",(0,r.yg)("inlineCode",{parentName:"li"},"number"),">"," | id set of the heap nodes (JS objects in heap) you would like to query"))),(0,r.yg)("li",{parentName:"ul"},(0,r.yg)("p",{parentName:"li"},(0,r.yg)("strong",{parentName:"p"},"Returns"),": ",(0,r.yg)("inlineCode",{parentName:"p"},"Set"),"<",(0,r.yg)("a",{parentName:"p",href:"/memlab/docs/api/interfaces/core_src.IHeapNode"},(0,r.yg)("inlineCode",{parentName:"a"},"IHeapNode")),">"," | a set of those heap nodes. The set will only include\nnodes that are found in the heap. If none of the input ids are found,\nthis API will return an empty set.")),(0,r.yg)("li",{parentName:"ul"},(0,r.yg)("p",{parentName:"li"},(0,r.yg)("strong",{parentName:"p"},"Examples"),":"))),(0,r.yg)("pre",null,(0,r.yg)("code",{parentName:"pre",className:"language-typescript"},"import type {IHeapSnapshot} from '@memlab/core';\nimport {dumpNodeHeapSnapshot} from '@memlab/core';\nimport {getFullHeapFromFile} from '@memlab/heap-analysis';\n\n(async function () {\n const heapFile = dumpNodeHeapSnapshot();\n const heap: IHeapSnapshot = await getFullHeapFromFile(heapFile);\n\n // suppose 1000 is not a valid id in the heap\n const set = heap.getNodesByIdSet(new Set([1, 2, 1000, 3]));\n set // should be Set([node1, node2, node3])\n})();\n")),(0,r.yg)("ul",null,(0,r.yg)("li",{parentName:"ul"},(0,r.yg)("strong",{parentName:"li"},"Source"),":",(0,r.yg)("ul",{parentName:"li"},(0,r.yg)("li",{parentName:"ul"},(0,r.yg)("a",{parentName:"li",href:"https://github.com/facebook/memlab/blob/eebc764/packages/core/src/lib/Types.ts#L1406"},"core/src/lib/Types.ts:1406"))))),(0,r.yg)("hr",null),(0,r.yg)("h3",{id:"getnodesbyidsids"},(0,r.yg)("a",{id:"getnodesbyids"}),(0,r.yg)("strong",{parentName:"h3"},"getNodesByIds"),"(",(0,r.yg)("inlineCode",{parentName:"h3"},"ids"),")"),(0,r.yg)("p",null,"Given an array of ids of heap nodes (JS objects in heap), use this API\nto get an array of those heap nodes."),(0,r.yg)("ul",null,(0,r.yg)("li",{parentName:"ul"},(0,r.yg)("p",{parentName:"li"},(0,r.yg)("strong",{parentName:"p"},"Parameters"),":"),(0,r.yg)("ul",{parentName:"li"},(0,r.yg)("li",{parentName:"ul"},(0,r.yg)("inlineCode",{parentName:"li"},"ids"),": ",(0,r.yg)("inlineCode",{parentName:"li"},"number"),"[] | id array of the heap nodes (JS objects in heap) you would like to query"))),(0,r.yg)("li",{parentName:"ul"},(0,r.yg)("p",{parentName:"li"},(0,r.yg)("strong",{parentName:"p"},"Returns"),": ",(0,r.yg)("a",{parentName:"p",href:"/memlab/docs/api/modules/core_src#nullable"},(0,r.yg)("inlineCode",{parentName:"a"},"Nullable")),"<",(0,r.yg)("a",{parentName:"p",href:"/memlab/docs/api/interfaces/core_src.IHeapNode"},(0,r.yg)("inlineCode",{parentName:"a"},"IHeapNode")),">","[] | an array of those heap nodes. The return array will preserve the\norder of the input array. If an id is not found in the heap, the\ncorresponding element in the return array will be ",(0,r.yg)("inlineCode",{parentName:"p"},"null"),".")),(0,r.yg)("li",{parentName:"ul"},(0,r.yg)("p",{parentName:"li"},(0,r.yg)("strong",{parentName:"p"},"Examples"),":"))),(0,r.yg)("pre",null,(0,r.yg)("code",{parentName:"pre",className:"language-typescript"},"import type {IHeapSnapshot} from '@memlab/core';\nimport {dumpNodeHeapSnapshot} from '@memlab/core';\nimport {getFullHeapFromFile} from '@memlab/heap-analysis';\n\n(async function () {\n const heapFile = dumpNodeHeapSnapshot();\n const heap: IHeapSnapshot = await getFullHeapFromFile(heapFile);\n\n // suppose 1000 is not a valid id in the heap\n const nodes = heap.getNodesByIds([1, 2, 1000, 3]);\n nodes // should be [node1, node2, null, node3]\n})();\n")),(0,r.yg)("ul",null,(0,r.yg)("li",{parentName:"ul"},(0,r.yg)("strong",{parentName:"li"},"Source"),":",(0,r.yg)("ul",{parentName:"li"},(0,r.yg)("li",{parentName:"ul"},(0,r.yg)("a",{parentName:"li",href:"https://github.com/facebook/memlab/blob/eebc764/packages/core/src/lib/Types.ts#L1380"},"core/src/lib/Types.ts:1380"))))),(0,r.yg)("hr",null),(0,r.yg)("h3",{id:"hasobjectwithclassnameclassname"},(0,r.yg)("a",{id:"hasobjectwithclassname"}),(0,r.yg)("strong",{parentName:"h3"},"hasObjectWithClassName"),"(",(0,r.yg)("inlineCode",{parentName:"h3"},"className"),")"),(0,r.yg)("p",null,"Search for the heap and check if there is any JS object instance with\na specified constructor name."),(0,r.yg)("ul",null,(0,r.yg)("li",{parentName:"ul"},(0,r.yg)("p",{parentName:"li"},(0,r.yg)("strong",{parentName:"p"},"Parameters"),":"),(0,r.yg)("ul",{parentName:"li"},(0,r.yg)("li",{parentName:"ul"},(0,r.yg)("inlineCode",{parentName:"li"},"className"),": ",(0,r.yg)("inlineCode",{parentName:"li"},"string")," | The constructor name of the object instance"))),(0,r.yg)("li",{parentName:"ul"},(0,r.yg)("p",{parentName:"li"},(0,r.yg)("strong",{parentName:"p"},"Returns"),": ",(0,r.yg)("inlineCode",{parentName:"p"},"boolean")," | ",(0,r.yg)("inlineCode",{parentName:"p"},"true")," if there is at least one such object in the heap")),(0,r.yg)("li",{parentName:"ul"},(0,r.yg)("p",{parentName:"li"},(0,r.yg)("strong",{parentName:"p"},"Examples"),": you can write a jest unit test with memory assertions:"))),(0,r.yg)("pre",null,(0,r.yg)("code",{parentName:"pre",className:"language-typescript"},"// save as example.test.ts\nimport type {IHeapSnapshot, Nullable} from '@memlab/core';\nimport {config, takeNodeMinimalHeap} from '@memlab/core';\n\nclass TestObject {\n public arr1 = [1, 2, 3];\n public arr2 = ['1', '2', '3'];\n}\n\ntest('memory test with heap assertion', async () => {\n config.muteConsole = true; // no console output\n\n let obj: Nullable = new TestObject();\n // get a heap snapshot of the current program state\n let heap: IHeapSnapshot = await takeNodeMinimalHeap();\n\n // call some function that may add references to obj\n rabbitHole(obj)\n\n expect(heap.hasObjectWithClassName('TestObject')).toBe(true);\n obj = null;\n\n heap = await takeNodeMinimalHeap();\n // if rabbitHole does not have any side effect that\n // adds new references to obj, then obj can be GCed\n expect(heap.hasObjectWithClassName('TestObject')).toBe(false);\n\n}, 30000);\n")),(0,r.yg)("ul",null,(0,r.yg)("li",{parentName:"ul"},(0,r.yg)("strong",{parentName:"li"},"Source"),":",(0,r.yg)("ul",{parentName:"li"},(0,r.yg)("li",{parentName:"ul"},(0,r.yg)("a",{parentName:"li",href:"https://github.com/facebook/memlab/blob/eebc764/packages/core/src/lib/Types.ts#L1445"},"core/src/lib/Types.ts:1445"))))),(0,r.yg)("hr",null),(0,r.yg)("h3",{id:"hasobjectwithpropertynamenameorindex"},(0,r.yg)("a",{id:"hasobjectwithpropertyname"}),(0,r.yg)("strong",{parentName:"h3"},"hasObjectWithPropertyName"),"(",(0,r.yg)("inlineCode",{parentName:"h3"},"nameOrIndex"),")"),(0,r.yg)("p",null,"Search for the heap and check if there is any JS object instance with\na specified property name."),(0,r.yg)("ul",null,(0,r.yg)("li",{parentName:"ul"},(0,r.yg)("p",{parentName:"li"},(0,r.yg)("strong",{parentName:"p"},"Parameters"),":"),(0,r.yg)("ul",{parentName:"li"},(0,r.yg)("li",{parentName:"ul"},(0,r.yg)("inlineCode",{parentName:"li"},"nameOrIndex"),": ",(0,r.yg)("inlineCode",{parentName:"li"},"string")," ","|"," ",(0,r.yg)("inlineCode",{parentName:"li"},"number")," | The property name (string) or element index (number) on the object instance"))),(0,r.yg)("li",{parentName:"ul"},(0,r.yg)("p",{parentName:"li"},(0,r.yg)("strong",{parentName:"p"},"Returns"),": ",(0,r.yg)("inlineCode",{parentName:"p"},"boolean")," | returns ",(0,r.yg)("inlineCode",{parentName:"p"},"true")," if there is at least one such object in the heap")),(0,r.yg)("li",{parentName:"ul"},(0,r.yg)("p",{parentName:"li"},(0,r.yg)("strong",{parentName:"p"},"Examples"),":"))),(0,r.yg)("pre",null,(0,r.yg)("code",{parentName:"pre",className:"language-typescript"},"import type {IHeapSnapshot} from '@memlab/core';\nimport {dumpNodeHeapSnapshot} from '@memlab/core';\nimport {getFullHeapFromFile} from '@memlab/heap-analysis';\n\n(async function () {\n // eslint-disable-next-line @typescript-eslint/no-unused-vars\n const object = {'memlab-test-heap-property': 'memlab-test-heap-value'};\n\n const heapFile = dumpNodeHeapSnapshot();\n const heap: IHeapSnapshot = await getFullHeapFromFile(heapFile);\n\n // should be true\n console.log(heap.hasObjectWithPropertyName('memlab-test-heap-property'));\n})();\n")),(0,r.yg)("ul",null,(0,r.yg)("li",{parentName:"ul"},(0,r.yg)("strong",{parentName:"li"},"Source"),":",(0,r.yg)("ul",{parentName:"li"},(0,r.yg)("li",{parentName:"ul"},(0,r.yg)("a",{parentName:"li",href:"https://github.com/facebook/memlab/blob/eebc764/packages/core/src/lib/Types.ts#L1499"},"core/src/lib/Types.ts:1499"))))),(0,r.yg)("hr",null),(0,r.yg)("h3",{id:"hasobjectwithtagtag"},(0,r.yg)("a",{id:"hasobjectwithtag"}),(0,r.yg)("strong",{parentName:"h3"},"hasObjectWithTag"),"(",(0,r.yg)("inlineCode",{parentName:"h3"},"tag"),")"),(0,r.yg)("p",null,"Search for the heap and check if there is any JS object instance with\na marker tagged by ",(0,r.yg)("a",{parentName:"p",href:"/memlab/docs/api/modules/core_src#tagobject"},"tagObject"),"."),(0,r.yg)("p",null,"The ",(0,r.yg)("inlineCode",{parentName:"p"},"tagObject")," API does not modify the object instance in any way\n(e.g., no additional or hidden properties added to the tagged object)."),(0,r.yg)("ul",null,(0,r.yg)("li",{parentName:"ul"},(0,r.yg)("strong",{parentName:"li"},"Parameters"),":",(0,r.yg)("ul",{parentName:"li"},(0,r.yg)("li",{parentName:"ul"},(0,r.yg)("inlineCode",{parentName:"li"},"tag"),": ",(0,r.yg)("inlineCode",{parentName:"li"},"string")," | marker name on the object instances tagged by ",(0,r.yg)("a",{parentName:"li",href:"/memlab/docs/api/modules/core_src#tagobject"},"tagObject")))),(0,r.yg)("li",{parentName:"ul"},(0,r.yg)("strong",{parentName:"li"},"Returns"),": ",(0,r.yg)("inlineCode",{parentName:"li"},"boolean")," | returns ",(0,r.yg)("inlineCode",{parentName:"li"},"true")," if there is at least one such object in the 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To import\nthis type, check out ",(0,r.yg)("a",{parentName:"li",href:"/memlab/docs/api/modules/core_src#page"},"Page"),"."))),(0,r.yg)("li",{parentName:"ul"},(0,r.yg)("p",{parentName:"li"},(0,r.yg)("strong",{parentName:"p"},"Examples"),":"))),(0,r.yg)("pre",null,(0,r.yg)("code",{parentName:"pre",className:"language-typescript"},"const scenario = {\n url: () => 'https://www.npmjs.com/',\n action: async (page) => {\n await page.click('a[href=\"/link\"]');\n },\n back: async (page) => {\n await page.click('a[href=\"/back\"]');\n },\n}\n\nmodule.exports = scenario;\n")),(0,r.yg)("p",null,"Note: always clean up external puppeteer references to JS objects\nin the browser context."),(0,r.yg)("pre",null,(0,r.yg)("code",{parentName:"pre",className:"language-typescript"},"const scenario = {\n url: () => 'https://www.npmjs.com/',\n action: async (page) => {\n const elements = await page.$x(\"//button[contains(., 'Text in Button')]\");\n const [button] = elements;\n if (button) {\n await button.click();\n }\n // dispose external references to JS objects in browser context\n await promise.all(elements.map(e => e.dispose()));\n },\n back: async (page) => ... ,\n}\n\nmodule.exports = scenario;\n")),(0,r.yg)("ul",null,(0,r.yg)("li",{parentName:"ul"},(0,r.yg)("strong",{parentName:"li"},"Source"),":",(0,r.yg)("ul",{parentName:"li"},(0,r.yg)("li",{parentName:"ul"},(0,r.yg)("a",{parentName:"li",href:"https://github.com/facebook/memlab/blob/c360a62/packages/core/src/lib/Types.ts#L841"},"core/src/lib/Types.ts:841"))))),(0,r.yg)("hr",null),(0,r.yg)("h3",{id:"-optional-back-interactionscallback"},(0,r.yg)("a",{id:"back",name:"back"})," ",(0,r.yg)("inlineCode",{parentName:"h3"},"Optional")," ",(0,r.yg)("strong",{parentName:"h3"},"back"),": ",(0,r.yg)("a",{parentName:"h3",href:"/memlab/docs/api/modules/core_src#interactionscallback"},(0,r.yg)("inlineCode",{parentName:"a"},"InteractionsCallback"))),(0,r.yg)("p",null,(0,r.yg)("inlineCode",{parentName:"p"},"back")," is the callback function that specifies how memlab should\nback/revert the ",(0,r.yg)("inlineCode",{parentName:"p"},"action")," callback. Think of it as an undo action."),(0,r.yg)("ul",null,(0,r.yg)("li",{parentName:"ul"},(0,r.yg)("p",{parentName:"li"},(0,r.yg)("strong",{parentName:"p"},"Parameters"),":"),(0,r.yg)("ul",{parentName:"li"},(0,r.yg)("li",{parentName:"ul"},(0,r.yg)("inlineCode",{parentName:"li"},"page"),": ",(0,r.yg)("code",null,(0,r.yg)("a",{parentName:"li",href:"/memlab/docs/api/modules/core_src#page"},"Page"))," | the puppeteer\n",(0,r.yg)("a",{parentName:"li",href:"https://pptr.dev/api/puppeteer.page"},(0,r.yg)("inlineCode",{parentName:"a"},"Page")),"\nobject, which provides APIs to interact with the web browser. To import\nthis type, check out ",(0,r.yg)("a",{parentName:"li",href:"/memlab/docs/api/modules/core_src#page"},"Page"),"."))),(0,r.yg)("li",{parentName:"ul"},(0,r.yg)("p",{parentName:"li"},(0,r.yg)("strong",{parentName:"p"},"Examples"),":"))),(0,r.yg)("pre",null,(0,r.yg)("code",{parentName:"pre",className:"language-typescript"},"const scenario = {\n url: () => 'https://www.npmjs.com/',\n action: async (page) => {\n await page.click('a[href=\"/link\"]');\n },\n back: async (page) => {\n await page.click('a[href=\"/back\"]');\n },\n}\n")),(0,r.yg)("p",null,"Check out ",(0,r.yg)("a",{parentName:"p",href:"/docs/how-memlab-works"},"this page")," on why\nmemlab needs to undo/revert the ",(0,r.yg)("inlineCode",{parentName:"p"},"action")," callback."),(0,r.yg)("ul",null,(0,r.yg)("li",{parentName:"ul"},(0,r.yg)("strong",{parentName:"li"},"Source"),":",(0,r.yg)("ul",{parentName:"li"},(0,r.yg)("li",{parentName:"ul"},(0,r.yg)("a",{parentName:"li",href:"https://github.com/facebook/memlab/blob/c360a62/packages/core/src/lib/Types.ts#L867"},"core/src/lib/Types.ts:867"))))),(0,r.yg)("hr",null),(0,r.yg)("h3",{id:"-optional-beforeinitialpageload-interactionscallback"},(0,r.yg)("a",{id:"beforeinitialpageload",name:"beforeinitialpageload"})," ",(0,r.yg)("inlineCode",{parentName:"h3"},"Optional")," ",(0,r.yg)("strong",{parentName:"h3"},"beforeInitialPageLoad"),": ",(0,r.yg)("a",{parentName:"h3",href:"/memlab/docs/api/modules/core_src#interactionscallback"},(0,r.yg)("inlineCode",{parentName:"a"},"InteractionsCallback"))),(0,r.yg)("p",null,(0,r.yg)("inlineCode",{parentName:"p"},"beforeInitialPageLoad")," is the callback function that will be called only\nonce before the initial page load. This callback can be used to set up\nthe HTTP headers or to prepare data before loading the web page."),(0,r.yg)("ul",null,(0,r.yg)("li",{parentName:"ul"},(0,r.yg)("p",{parentName:"li"},(0,r.yg)("strong",{parentName:"p"},"Parameters"),":"),(0,r.yg)("ul",{parentName:"li"},(0,r.yg)("li",{parentName:"ul"},(0,r.yg)("inlineCode",{parentName:"li"},"page"),": ",(0,r.yg)("code",null,(0,r.yg)("a",{parentName:"li",href:"/memlab/docs/api/modules/core_src#page"},"Page"))," | the puppeteer\n",(0,r.yg)("a",{parentName:"li",href:"https://pptr.dev/api/puppeteer.page"},(0,r.yg)("inlineCode",{parentName:"a"},"Page")),"\nobject, which provides APIs to interact with the web browser. To import\nthis type, check out ",(0,r.yg)("a",{parentName:"li",href:"/memlab/docs/api/modules/core_src#page"},"Page"),"."))),(0,r.yg)("li",{parentName:"ul"},(0,r.yg)("p",{parentName:"li"},(0,r.yg)("strong",{parentName:"p"},"Examples"),":"))),(0,r.yg)("pre",null,(0,r.yg)("code",{parentName:"pre",className:"language-typescript"},"const scenario = {\n url: () => 'https://www.npmjs.com/',\n beforeInitialPageLoad: async (page) => {\n // before the initial page load\n },\n action: async (page) => {\n await page.click('a[href=\"/link\"]');\n },\n back: async (page) => {\n await page.click('a[href=\"/back\"]');\n },\n}\n\nmodule.exports = scenario;\n")),(0,r.yg)("ul",null,(0,r.yg)("li",{parentName:"ul"},(0,r.yg)("strong",{parentName:"li"},"Source"),":",(0,r.yg)("ul",{parentName:"li"},(0,r.yg)("li",{parentName:"ul"},(0,r.yg)("a",{parentName:"li",href:"https://github.com/facebook/memlab/blob/c360a62/packages/core/src/lib/Types.ts#L745"},"core/src/lib/Types.ts:745"))))),(0,r.yg)("hr",null),(0,r.yg)("h3",{id:"-optional-beforeleakfilter-initleakfiltercallback"},(0,r.yg)("a",{id:"beforeleakfilter",name:"beforeleakfilter"})," ",(0,r.yg)("inlineCode",{parentName:"h3"},"Optional")," ",(0,r.yg)("strong",{parentName:"h3"},"beforeLeakFilter"),": ",(0,r.yg)("a",{parentName:"h3",href:"/memlab/docs/api/modules/core_src#initleakfiltercallback"},(0,r.yg)("inlineCode",{parentName:"a"},"InitLeakFilterCallback"))),(0,r.yg)("p",null,"Lifecycle function callback that is invoked initially once before\nthe subsequent ",(0,r.yg)("inlineCode",{parentName:"p"},"leakFilter")," function calls. This callback could\nbe used to initialize some data stores or to any one-off\npreprocessings."),(0,r.yg)("ul",null,(0,r.yg)("li",{parentName:"ul"},(0,r.yg)("p",{parentName:"li"},(0,r.yg)("strong",{parentName:"p"},"Parameters"),":"),(0,r.yg)("ul",{parentName:"li"},(0,r.yg)("li",{parentName:"ul"},(0,r.yg)("inlineCode",{parentName:"li"},"snapshot"),": ",(0,r.yg)("code",null,(0,r.yg)("a",{parentName:"li",href:"/memlab/docs/api/interfaces/core_src.IHeapSnapshot"},"IHeapSnapshot"))," | the final heap\nsnapshot taken after all browser interactions are done.\nCheck out ",(0,r.yg)("a",{parentName:"li",href:"/memlab/docs/api/interfaces/core_src.IHeapSnapshot"},"IHeapSnapshot")," for more APIs that queries the\nheap snapshot."),(0,r.yg)("li",{parentName:"ul"},(0,r.yg)("inlineCode",{parentName:"li"},"leakedNodeIds"),": ",(0,r.yg)("inlineCode",{parentName:"li"},"Set")," | the set of ids of all JS heap objects\nallocated by the ",(0,r.yg)("inlineCode",{parentName:"li"},"action")," call but not released after the ",(0,r.yg)("inlineCode",{parentName:"li"},"back")," call\nin browser."))),(0,r.yg)("li",{parentName:"ul"},(0,r.yg)("p",{parentName:"li"},(0,r.yg)("strong",{parentName:"p"},"Examples"),":"))),(0,r.yg)("pre",null,(0,r.yg)("code",{parentName:"pre",className:"language-typescript"},"module.exports = {\n url: () => ... ,\n action: async (page) => ... ,\n back: async (page) => ... ,\n beforeLeakFilter: (snapshot, leakedNodeIds) {\n // initialize some data stores\n },\n};\n")),(0,r.yg)("ul",null,(0,r.yg)("li",{parentName:"ul"},(0,r.yg)("strong",{parentName:"li"},"Source"),":",(0,r.yg)("ul",{parentName:"li"},(0,r.yg)("li",{parentName:"ul"},(0,r.yg)("a",{parentName:"li",href:"https://github.com/facebook/memlab/blob/c360a62/packages/core/src/lib/Types.ts#L953"},"core/src/lib/Types.ts:953"))))),(0,r.yg)("hr",null),(0,r.yg)("h3",{id:"-optional-ispageloaded-checkpageloadcallback"},(0,r.yg)("a",{id:"ispageloaded",name:"ispageloaded"})," ",(0,r.yg)("inlineCode",{parentName:"h3"},"Optional")," ",(0,r.yg)("strong",{parentName:"h3"},"isPageLoaded"),": ",(0,r.yg)("a",{parentName:"h3",href:"/memlab/docs/api/modules/core_src#checkpageloadcallback"},(0,r.yg)("inlineCode",{parentName:"a"},"CheckPageLoadCallback"))),(0,r.yg)("p",null,"Optional callback function that checks if the web page is loaded\nfor the initial page load and subsequent browser interactions."),(0,r.yg)("p",null,"If this callback is not provided, memlab by default\nconsiders a navigation to be finished when there are no network\nconnections for at least 500ms."),(0,r.yg)("ul",null,(0,r.yg)("li",{parentName:"ul"},(0,r.yg)("p",{parentName:"li"},(0,r.yg)("strong",{parentName:"p"},"Parameters"),":"),(0,r.yg)("ul",{parentName:"li"},(0,r.yg)("li",{parentName:"ul"},(0,r.yg)("inlineCode",{parentName:"li"},"page"),": ",(0,r.yg)("code",null,(0,r.yg)("a",{parentName:"li",href:"/memlab/docs/api/modules/core_src#page"},"Page"))," | the puppeteer\n",(0,r.yg)("a",{parentName:"li",href:"https://pptr.dev/api/puppeteer.page"},(0,r.yg)("inlineCode",{parentName:"a"},"Page")),"\nobject, which provides APIs to interact with the web browser. To import\nthis type, check out ",(0,r.yg)("a",{parentName:"li",href:"/memlab/docs/api/modules/core_src#page"},"Page"),"."))),(0,r.yg)("li",{parentName:"ul"},(0,r.yg)("p",{parentName:"li"},(0,r.yg)("strong",{parentName:"p"},"Returns"),": a boolean value, if it returns ",(0,r.yg)("inlineCode",{parentName:"p"},"true"),", memlab will consider\nthe navigation completes, if it returns ",(0,r.yg)("inlineCode",{parentName:"p"},"false"),", memlab will keep calling\nthis callback until it returns ",(0,r.yg)("inlineCode",{parentName:"p"},"true"),". This is an async callback, you can\nalso ",(0,r.yg)("inlineCode",{parentName:"p"},"await")," and returns ",(0,r.yg)("inlineCode",{parentName:"p"},"true")," until some async logic is resolved.")),(0,r.yg)("li",{parentName:"ul"},(0,r.yg)("p",{parentName:"li"},(0,r.yg)("strong",{parentName:"p"},"Examples"),":"))),(0,r.yg)("pre",null,(0,r.yg)("code",{parentName:"pre",className:"language-typescript"},"module.exports = {\n url: () => ... ,\n action: async (page) => ... ,\n back: async (page) => ... ,\n isPageLoaded: async (page) => {\n await page.waitForNavigation({\n // consider navigation to be finished when there are\n // no more than 2 network connections for at least 500 ms.\n waitUntil: 'networkidle2',\n // Maximum navigation time in milliseconds\n timeout: 5000,\n });\n return true;\n },\n};\n")),(0,r.yg)("ul",null,(0,r.yg)("li",{parentName:"ul"},(0,r.yg)("strong",{parentName:"li"},"Source"),":",(0,r.yg)("ul",{parentName:"li"},(0,r.yg)("li",{parentName:"ul"},(0,r.yg)("a",{parentName:"li",href:"https://github.com/facebook/memlab/blob/c360a62/packages/core/src/lib/Types.ts#L925"},"core/src/lib/Types.ts:925"))))),(0,r.yg)("hr",null),(0,r.yg)("h3",{id:"-optional-leakfilter-leakfiltercallback"},(0,r.yg)("a",{id:"leakfilter",name:"leakfilter"})," ",(0,r.yg)("inlineCode",{parentName:"h3"},"Optional")," ",(0,r.yg)("strong",{parentName:"h3"},"leakFilter"),": ",(0,r.yg)("a",{parentName:"h3",href:"/memlab/docs/api/modules/core_src#leakfiltercallback"},(0,r.yg)("inlineCode",{parentName:"a"},"LeakFilterCallback"))),(0,r.yg)("p",null,"This callback defines how you want to filter out the\nleaked objects. The callback is called for every node (JS heap\nobject in browser) allocated by the ",(0,r.yg)("inlineCode",{parentName:"p"},"action")," callback, but not\nreleased after the ",(0,r.yg)("inlineCode",{parentName:"p"},"back")," callback. Those objects could be caches\nthat are retained in memory on purpose, or they are memory leaks."),(0,r.yg)("p",null,"This optional callback allows you to define your own algorithm\nto cherry pick memory leaks for specific JS program under test."),(0,r.yg)("p",null,"If this optional callback is not defined, memlab will use its\nbuilt-in leak filter, which considers detached DOM elements\nand unmounted Fiber nodes (detached from React Fiber tree) as\nmemory leaks."),(0,r.yg)("ul",null,(0,r.yg)("li",{parentName:"ul"},(0,r.yg)("p",{parentName:"li"},(0,r.yg)("strong",{parentName:"p"},"Parameters"),":"),(0,r.yg)("ul",{parentName:"li"},(0,r.yg)("li",{parentName:"ul"},(0,r.yg)("inlineCode",{parentName:"li"},"node"),": ",(0,r.yg)("code",null,(0,r.yg)("a",{parentName:"li",href:"/memlab/docs/api/interfaces/core_src.IHeapNode"},"IHeapNode"))," | the heap object\nallocated but not released. This filter callback will be applied\nto each node allocated but not released in the heap snapshot."),(0,r.yg)("li",{parentName:"ul"},(0,r.yg)("inlineCode",{parentName:"li"},"snapshot"),": ",(0,r.yg)("code",null,(0,r.yg)("a",{parentName:"li",href:"/memlab/docs/api/interfaces/core_src.IHeapSnapshot"},"IHeapSnapshot"))," | the final heap\nsnapshot taken after all browser interactions are done.\nCheck out ",(0,r.yg)("a",{parentName:"li",href:"/memlab/docs/api/interfaces/core_src.IHeapSnapshot"},"IHeapSnapshot")," for more APIs that queries the\nheap snapshot."),(0,r.yg)("li",{parentName:"ul"},(0,r.yg)("inlineCode",{parentName:"li"},"leakedNodeIds"),": ",(0,r.yg)("inlineCode",{parentName:"li"},"Set")," | the set of ids of all JS heap objects\nallocated by the ",(0,r.yg)("inlineCode",{parentName:"li"},"action")," call but not released after the ",(0,r.yg)("inlineCode",{parentName:"li"},"back")," call\nin browser."))),(0,r.yg)("li",{parentName:"ul"},(0,r.yg)("p",{parentName:"li"},(0,r.yg)("strong",{parentName:"p"},"Returns"),": the boolean value indicating whether the given node in\nthe snapshot should be considered as leaked.")),(0,r.yg)("li",{parentName:"ul"},(0,r.yg)("p",{parentName:"li"},(0,r.yg)("strong",{parentName:"p"},"Examples"),":"))),(0,r.yg)("pre",null,(0,r.yg)("code",{parentName:"pre",className:"language-typescript"},"module.exports = {\n url: () => ... ,\n action: async (page) => ... ,\n back: async (page) => ... ,\n leakFilter(node, snapshot, leakedNodeIds) {\n // any unreleased node (JS heap object) with 1MB+\n // retained size is considered a memory leak\n return node.retainedSize > 1000000;\n },\n};\n")),(0,r.yg)("ul",null,(0,r.yg)("li",{parentName:"ul"},(0,r.yg)("strong",{parentName:"li"},"Source"),":",(0,r.yg)("ul",{parentName:"li"},(0,r.yg)("li",{parentName:"ul"},(0,r.yg)("a",{parentName:"li",href:"https://github.com/facebook/memlab/blob/c360a62/packages/core/src/lib/Types.ts#L998"},"core/src/lib/Types.ts:998"))))),(0,r.yg)("hr",null),(0,r.yg)("h3",{id:"-optional-retainerreferencefilter-referencefiltercallback"},(0,r.yg)("a",{id:"retainerreferencefilter",name:"retainerreferencefilter"})," ",(0,r.yg)("inlineCode",{parentName:"h3"},"Optional")," ",(0,r.yg)("strong",{parentName:"h3"},"retainerReferenceFilter"),": ",(0,r.yg)("a",{parentName:"h3",href:"/memlab/docs/api/modules/core_src#referencefiltercallback"},(0,r.yg)("inlineCode",{parentName:"a"},"ReferenceFilterCallback"))),(0,r.yg)("p",null,"Callback that can be used to define a logic to decide whether\na reference should be considered as part of the retainer trace.\nThe callback is called for every reference (edge) in the heap snapshot."),(0,r.yg)("p",null,"For concrete examples, check out ",(0,r.yg)("a",{parentName:"p",href:"/memlab/docs/api/interfaces/core_src.IScenario#leakfilter"},"leakFilter"),"."),(0,r.yg)("ul",null,(0,r.yg)("li",{parentName:"ul"},(0,r.yg)("p",{parentName:"li"},(0,r.yg)("strong",{parentName:"p"},"Parameters"),":"),(0,r.yg)("ul",{parentName:"li"},(0,r.yg)("li",{parentName:"ul"},(0,r.yg)("inlineCode",{parentName:"li"},"edge")," : ",(0,r.yg)("code",null,(0,r.yg)("a",{parentName:"li",href:"/memlab/docs/api/interfaces/core_src.IHeapEdge"},"IHeapEdge"))," | the reference (edge)\nthat is considered for calcualting the retainer trace"),(0,r.yg)("li",{parentName:"ul"},(0,r.yg)("inlineCode",{parentName:"li"},"snapshot"),": ",(0,r.yg)("code",null,(0,r.yg)("a",{parentName:"li",href:"/memlab/docs/api/interfaces/core_src.IHeapSnapshot"},"IHeapSnapshot"))," | the heap snapshot\ntaken after all browser interactions are done.\nCheck out ",(0,r.yg)("a",{parentName:"li",href:"/memlab/docs/api/interfaces/core_src.IHeapSnapshot"},"IHeapSnapshot")," for more APIs that queries the\nheap snapshot."),(0,r.yg)("li",{parentName:"ul"},(0,r.yg)("inlineCode",{parentName:"li"},"isReferenceUsedByDefault"),": ",(0,r.yg)("inlineCode",{parentName:"li"},"boolean")," | MemLab has its own default\nlogic for whether a reference should be considered as part of the\nretainer trace, if this parameter is true, it means MemLab will\nconsider this reference when calculating the retainer trace."))),(0,r.yg)("li",{parentName:"ul"},(0,r.yg)("p",{parentName:"li"},(0,r.yg)("strong",{parentName:"p"},"Returns"),": the value indicating whether the given reference should be\nconsidered when calculating the retainer trace. Note that when this\ncallback returns true, the reference will only be considered as a candidate\nfor retainer trace, so it may or may not be included in the retainer trace;\nhowever, if this callback returns false, the reference will be excluded."))),(0,r.yg)("p",null,"Note that by excluding a dominator reference of an object (i.e., an edge\nthat must be traveled through to reach the heap object from GC roots),\nthe object will be considered as unreachable in the heap graph; and\ntherefore, the reference and heap object will not be included in the\nretainer trace detection and retainer size calculation."),(0,r.yg)("ul",null,(0,r.yg)("li",{parentName:"ul"},(0,r.yg)("strong",{parentName:"li"},"Examples"),":")),(0,r.yg)("pre",null,(0,r.yg)("code",{parentName:"pre",className:"language-javascript"},"// save as leak-filter.js\nmodule.exports = {\n retainerReferenceFilter(edge, _snapshot, _leakedNodeIds) {\n // exclude react fiber references\n if (edge.name_or_index.toString().startsWith('__reactFiber$')) {\n return false;\n }\n return true;\n }\n};\n")),(0,r.yg)("ul",null,(0,r.yg)("li",{parentName:"ul"},(0,r.yg)("strong",{parentName:"li"},"Source"),":",(0,r.yg)("ul",{parentName:"li"},(0,r.yg)("li",{parentName:"ul"},(0,r.yg)("a",{parentName:"li",href:"https://github.com/facebook/memlab/blob/c360a62/packages/core/src/lib/Types.ts#L1044"},"core/src/lib/Types.ts:1044"))))),(0,r.yg)("hr",null),(0,r.yg)("h3",{id:"-optional-setup-interactionscallback"},(0,r.yg)("a",{id:"setup",name:"setup"})," ",(0,r.yg)("inlineCode",{parentName:"h3"},"Optional")," ",(0,r.yg)("strong",{parentName:"h3"},"setup"),": ",(0,r.yg)("a",{parentName:"h3",href:"/memlab/docs/api/modules/core_src#interactionscallback"},(0,r.yg)("inlineCode",{parentName:"a"},"InteractionsCallback"))),(0,r.yg)("p",null,(0,r.yg)("inlineCode",{parentName:"p"},"setup")," is the callback function that will be called only once\nafter the initial page load. This callback can be used to log in\nif you have to (we recommend using ",(0,r.yg)("a",{parentName:"p",href:"/memlab/docs/api/interfaces/core_src.IScenario#cookies"},"cookies"),")\nor to prepare data before the ",(0,r.yg)("a",{parentName:"p",href:"/memlab/docs/api/interfaces/core_src.IScenario#action"},"action")," call."),(0,r.yg)("ul",null,(0,r.yg)("li",{parentName:"ul"},(0,r.yg)("p",{parentName:"li"},(0,r.yg)("strong",{parentName:"p"},"Parameters"),":"),(0,r.yg)("ul",{parentName:"li"},(0,r.yg)("li",{parentName:"ul"},(0,r.yg)("inlineCode",{parentName:"li"},"page"),": ",(0,r.yg)("code",null,(0,r.yg)("a",{parentName:"li",href:"/memlab/docs/api/modules/core_src#page"},"Page"))," | the puppeteer\n",(0,r.yg)("a",{parentName:"li",href:"https://pptr.dev/api/puppeteer.page"},(0,r.yg)("inlineCode",{parentName:"a"},"Page")),"\nobject, which provides APIs to interact with the web browser. To import\nthis type, check out ",(0,r.yg)("a",{parentName:"li",href:"/memlab/docs/api/modules/core_src#page"},"Page"),"."))),(0,r.yg)("li",{parentName:"ul"},(0,r.yg)("p",{parentName:"li"},(0,r.yg)("strong",{parentName:"p"},"Examples"),":"))),(0,r.yg)("pre",null,(0,r.yg)("code",{parentName:"pre",className:"language-typescript"},"const scenario = {\n url: () => 'https://www.npmjs.com/',\n setup: async (page) => {\n // log in or prepare data for the interaction\n },\n action: async (page) => {\n await page.click('a[href=\"/link\"]');\n },\n back: async (page) => {\n await page.click('a[href=\"/back\"]');\n },\n}\n\nmodule.exports = scenario;\n")),(0,r.yg)("ul",null,(0,r.yg)("li",{parentName:"ul"},(0,r.yg)("strong",{parentName:"li"},"Source"),":",(0,r.yg)("ul",{parentName:"li"},(0,r.yg)("li",{parentName:"ul"},(0,r.yg)("a",{parentName:"li",href:"https://github.com/facebook/memlab/blob/c360a62/packages/core/src/lib/Types.ts#L794"},"core/src/lib/Types.ts:794"))))),(0,r.yg)("h2",{id:"methods"},"Methods"),(0,r.yg)("h3",{id:"optional-cookies"},(0,r.yg)("a",{id:"cookies"}),(0,r.yg)("inlineCode",{parentName:"h3"},"Optional")," ",(0,r.yg)("strong",{parentName:"h3"},"cookies"),"()"),(0,r.yg)("p",null,"If the page you are running memlab against requires authentication or\nspecific cookie(s) to be set, you can pass them as\na list of ",(0,r.yg)("inlineCode",{parentName:"p"},"")," tuples."),(0,r.yg)("p",null,(0,r.yg)("strong",{parentName:"p"},"Note"),": please make sure that you provide the correct ",(0,r.yg)("inlineCode",{parentName:"p"},"domain")," field for\nthe cookies tuples. 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All objects allocated by the initial page load will be candidates\nfor memory leak filtering."),(0,r.yg)("ul",null,(0,r.yg)("li",{parentName:"ul"},(0,r.yg)("strong",{parentName:"li"},"Source"),":",(0,r.yg)("ul",{parentName:"li"},(0,r.yg)("li",{parentName:"ul"},(0,r.yg)("a",{parentName:"li",href:"https://github.com/facebook/memlab/blob/c360a62/packages/core/src/lib/Types.ts#L763"},"core/src/lib/Types.ts:763"))))))}m.isMDXComponent=!0}}]); \ No newline at end of file +"use strict";(self.webpackChunkmemlab_website=self.webpackChunkmemlab_website||[]).push([[9539],{5680:(e,a,n)=>{n.d(a,{xA:()=>s,yg:()=>d});var t=n(6540);function r(e,a,n){return a in e?Object.defineProperty(e,a,{value:n,enumerable:!0,configurable:!0,writable:!0}):e[a]=n,e}function l(e,a){var n=Object.keys(e);if(Object.getOwnPropertySymbols){var t=Object.getOwnPropertySymbols(e);a&&(t=t.filter((function(a){return Object.getOwnPropertyDescriptor(e,a).enumerable}))),n.push.apply(n,t)}return n}function i(e){for(var 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ReferenceFilterCallback',id:"-optional-retainerreferencefilter-referencefiltercallback",level:3},{value:' Optional setup: InteractionsCallback',id:"-optional-setup-interactionscallback",level:3},{value:"Methods",id:"methods",level:2},{value:'Optional cookies()',id:"optional-cookies",level:3},{value:'Optional repeat()',id:"optional-repeat",level:3},{value:'url()',id:"url",level:3}],s={toc:p},g="wrapper";function m(e){let{components:a,...n}=e;return(0,r.yg)(g,(0,t.A)({},s,n,{components:a,mdxType:"MDXLayout"}),(0,r.yg)("p",null,"Test scenario specifies how you want a E2E test to interact with a web browser.\nThe test scenario can be saved as a ",(0,r.yg)("inlineCode",{parentName:"p"},".js")," file and passed to the ",(0,r.yg)("inlineCode",{parentName:"p"},"memlab\nrun --scenario")," command:"),(0,r.yg)("pre",null,(0,r.yg)("code",{parentName:"pre",className:"language-javascript"},"// save as test.js and use in terminal:\n// $ memlab run --scenario test.js\n\nmodule.exports = {\n url: () => 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",(0,r.yg)("strong",{parentName:"h3"},"action"),": ",(0,r.yg)("a",{parentName:"h3",href:"/memlab/docs/api/modules/core_src#interactionscallback"},(0,r.yg)("inlineCode",{parentName:"a"},"InteractionsCallback"))),(0,r.yg)("p",null,(0,r.yg)("inlineCode",{parentName:"p"},"action")," is the callback function that defines the interaction\nwhere you want to trigger memory leaks after the initial page load.\nAll JS objects in browser allocated by the browser interactions triggered\nfrom the ",(0,r.yg)("inlineCode",{parentName:"p"},"action")," callback will be candidates for memory leak filtering."),(0,r.yg)("ul",null,(0,r.yg)("li",{parentName:"ul"},(0,r.yg)("p",{parentName:"li"},(0,r.yg)("strong",{parentName:"p"},"Parameters"),":"),(0,r.yg)("ul",{parentName:"li"},(0,r.yg)("li",{parentName:"ul"},(0,r.yg)("inlineCode",{parentName:"li"},"page"),": ",(0,r.yg)("code",null,(0,r.yg)("a",{parentName:"li",href:"/memlab/docs/api/modules/core_src#page"},"Page"))," | the 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To import\nthis type, check out ",(0,r.yg)("a",{parentName:"li",href:"/memlab/docs/api/modules/core_src#page"},"Page"),"."))),(0,r.yg)("li",{parentName:"ul"},(0,r.yg)("p",{parentName:"li"},(0,r.yg)("strong",{parentName:"p"},"Examples"),":"))),(0,r.yg)("pre",null,(0,r.yg)("code",{parentName:"pre",className:"language-typescript"},"const scenario = {\n url: () => 'https://www.npmjs.com/',\n action: async (page) => {\n await page.click('a[href=\"/link\"]');\n },\n back: async (page) => {\n await page.click('a[href=\"/back\"]');\n },\n}\n")),(0,r.yg)("p",null,"Check out ",(0,r.yg)("a",{parentName:"p",href:"/docs/how-memlab-works"},"this page")," on why\nmemlab needs to undo/revert the ",(0,r.yg)("inlineCode",{parentName:"p"},"action")," callback."),(0,r.yg)("ul",null,(0,r.yg)("li",{parentName:"ul"},(0,r.yg)("strong",{parentName:"li"},"Source"),":",(0,r.yg)("ul",{parentName:"li"},(0,r.yg)("li",{parentName:"ul"},(0,r.yg)("a",{parentName:"li",href:"https://github.com/facebook/memlab/blob/eebc764/packages/core/src/lib/Types.ts#L867"},"core/src/lib/Types.ts:867"))))),(0,r.yg)("hr",null),(0,r.yg)("h3",{id:"-optional-beforeinitialpageload-interactionscallback"},(0,r.yg)("a",{id:"beforeinitialpageload",name:"beforeinitialpageload"})," ",(0,r.yg)("inlineCode",{parentName:"h3"},"Optional")," ",(0,r.yg)("strong",{parentName:"h3"},"beforeInitialPageLoad"),": ",(0,r.yg)("a",{parentName:"h3",href:"/memlab/docs/api/modules/core_src#interactionscallback"},(0,r.yg)("inlineCode",{parentName:"a"},"InteractionsCallback"))),(0,r.yg)("p",null,(0,r.yg)("inlineCode",{parentName:"p"},"beforeInitialPageLoad")," is the callback function that will be called only\nonce before the initial page load. This callback can be used to set up\nthe HTTP headers or to prepare data before loading the web page."),(0,r.yg)("ul",null,(0,r.yg)("li",{parentName:"ul"},(0,r.yg)("p",{parentName:"li"},(0,r.yg)("strong",{parentName:"p"},"Parameters"),":"),(0,r.yg)("ul",{parentName:"li"},(0,r.yg)("li",{parentName:"ul"},(0,r.yg)("inlineCode",{parentName:"li"},"page"),": ",(0,r.yg)("code",null,(0,r.yg)("a",{parentName:"li",href:"/memlab/docs/api/modules/core_src#page"},"Page"))," | the puppeteer\n",(0,r.yg)("a",{parentName:"li",href:"https://pptr.dev/api/puppeteer.page"},(0,r.yg)("inlineCode",{parentName:"a"},"Page")),"\nobject, which provides APIs to interact with the web browser. To import\nthis type, check out ",(0,r.yg)("a",{parentName:"li",href:"/memlab/docs/api/modules/core_src#page"},"Page"),"."))),(0,r.yg)("li",{parentName:"ul"},(0,r.yg)("p",{parentName:"li"},(0,r.yg)("strong",{parentName:"p"},"Examples"),":"))),(0,r.yg)("pre",null,(0,r.yg)("code",{parentName:"pre",className:"language-typescript"},"const scenario = {\n url: () => 'https://www.npmjs.com/',\n beforeInitialPageLoad: async (page) => {\n // before the initial page load\n },\n action: async (page) => {\n await page.click('a[href=\"/link\"]');\n },\n back: async (page) => {\n await page.click('a[href=\"/back\"]');\n },\n}\n\nmodule.exports = scenario;\n")),(0,r.yg)("ul",null,(0,r.yg)("li",{parentName:"ul"},(0,r.yg)("strong",{parentName:"li"},"Source"),":",(0,r.yg)("ul",{parentName:"li"},(0,r.yg)("li",{parentName:"ul"},(0,r.yg)("a",{parentName:"li",href:"https://github.com/facebook/memlab/blob/eebc764/packages/core/src/lib/Types.ts#L745"},"core/src/lib/Types.ts:745"))))),(0,r.yg)("hr",null),(0,r.yg)("h3",{id:"-optional-beforeleakfilter-initleakfiltercallback"},(0,r.yg)("a",{id:"beforeleakfilter",name:"beforeleakfilter"})," ",(0,r.yg)("inlineCode",{parentName:"h3"},"Optional")," ",(0,r.yg)("strong",{parentName:"h3"},"beforeLeakFilter"),": ",(0,r.yg)("a",{parentName:"h3",href:"/memlab/docs/api/modules/core_src#initleakfiltercallback"},(0,r.yg)("inlineCode",{parentName:"a"},"InitLeakFilterCallback"))),(0,r.yg)("p",null,"Lifecycle function callback that is invoked initially once before\nthe subsequent ",(0,r.yg)("inlineCode",{parentName:"p"},"leakFilter")," function calls. This callback could\nbe used to initialize some data stores or to any one-off\npreprocessings."),(0,r.yg)("ul",null,(0,r.yg)("li",{parentName:"ul"},(0,r.yg)("p",{parentName:"li"},(0,r.yg)("strong",{parentName:"p"},"Parameters"),":"),(0,r.yg)("ul",{parentName:"li"},(0,r.yg)("li",{parentName:"ul"},(0,r.yg)("inlineCode",{parentName:"li"},"snapshot"),": ",(0,r.yg)("code",null,(0,r.yg)("a",{parentName:"li",href:"/memlab/docs/api/interfaces/core_src.IHeapSnapshot"},"IHeapSnapshot"))," | the final heap\nsnapshot taken after all browser interactions are done.\nCheck out ",(0,r.yg)("a",{parentName:"li",href:"/memlab/docs/api/interfaces/core_src.IHeapSnapshot"},"IHeapSnapshot")," for more APIs that queries the\nheap snapshot."),(0,r.yg)("li",{parentName:"ul"},(0,r.yg)("inlineCode",{parentName:"li"},"leakedNodeIds"),": ",(0,r.yg)("inlineCode",{parentName:"li"},"Set")," | the set of ids of all JS heap objects\nallocated by the ",(0,r.yg)("inlineCode",{parentName:"li"},"action")," call but not released after the ",(0,r.yg)("inlineCode",{parentName:"li"},"back")," call\nin browser."))),(0,r.yg)("li",{parentName:"ul"},(0,r.yg)("p",{parentName:"li"},(0,r.yg)("strong",{parentName:"p"},"Examples"),":"))),(0,r.yg)("pre",null,(0,r.yg)("code",{parentName:"pre",className:"language-typescript"},"module.exports = {\n url: () => ... ,\n action: async (page) => ... ,\n back: async (page) => ... ,\n beforeLeakFilter: (snapshot, leakedNodeIds) {\n // initialize some data stores\n },\n};\n")),(0,r.yg)("ul",null,(0,r.yg)("li",{parentName:"ul"},(0,r.yg)("strong",{parentName:"li"},"Source"),":",(0,r.yg)("ul",{parentName:"li"},(0,r.yg)("li",{parentName:"ul"},(0,r.yg)("a",{parentName:"li",href:"https://github.com/facebook/memlab/blob/eebc764/packages/core/src/lib/Types.ts#L953"},"core/src/lib/Types.ts:953"))))),(0,r.yg)("hr",null),(0,r.yg)("h3",{id:"-optional-ispageloaded-checkpageloadcallback"},(0,r.yg)("a",{id:"ispageloaded",name:"ispageloaded"})," ",(0,r.yg)("inlineCode",{parentName:"h3"},"Optional")," ",(0,r.yg)("strong",{parentName:"h3"},"isPageLoaded"),": ",(0,r.yg)("a",{parentName:"h3",href:"/memlab/docs/api/modules/core_src#checkpageloadcallback"},(0,r.yg)("inlineCode",{parentName:"a"},"CheckPageLoadCallback"))),(0,r.yg)("p",null,"Optional callback function that checks if the web page is loaded\nfor the initial page load and subsequent browser interactions."),(0,r.yg)("p",null,"If this callback is not provided, memlab by default\nconsiders a navigation to be finished when there are no network\nconnections for at least 500ms."),(0,r.yg)("ul",null,(0,r.yg)("li",{parentName:"ul"},(0,r.yg)("p",{parentName:"li"},(0,r.yg)("strong",{parentName:"p"},"Parameters"),":"),(0,r.yg)("ul",{parentName:"li"},(0,r.yg)("li",{parentName:"ul"},(0,r.yg)("inlineCode",{parentName:"li"},"page"),": ",(0,r.yg)("code",null,(0,r.yg)("a",{parentName:"li",href:"/memlab/docs/api/modules/core_src#page"},"Page"))," | the puppeteer\n",(0,r.yg)("a",{parentName:"li",href:"https://pptr.dev/api/puppeteer.page"},(0,r.yg)("inlineCode",{parentName:"a"},"Page")),"\nobject, which provides APIs to interact with the web browser. To import\nthis type, check out ",(0,r.yg)("a",{parentName:"li",href:"/memlab/docs/api/modules/core_src#page"},"Page"),"."))),(0,r.yg)("li",{parentName:"ul"},(0,r.yg)("p",{parentName:"li"},(0,r.yg)("strong",{parentName:"p"},"Returns"),": a boolean value, if it returns ",(0,r.yg)("inlineCode",{parentName:"p"},"true"),", memlab will consider\nthe navigation completes, if it returns ",(0,r.yg)("inlineCode",{parentName:"p"},"false"),", memlab will keep calling\nthis callback until it returns ",(0,r.yg)("inlineCode",{parentName:"p"},"true"),". This is an async callback, you can\nalso ",(0,r.yg)("inlineCode",{parentName:"p"},"await")," and returns ",(0,r.yg)("inlineCode",{parentName:"p"},"true")," until some async logic is resolved.")),(0,r.yg)("li",{parentName:"ul"},(0,r.yg)("p",{parentName:"li"},(0,r.yg)("strong",{parentName:"p"},"Examples"),":"))),(0,r.yg)("pre",null,(0,r.yg)("code",{parentName:"pre",className:"language-typescript"},"module.exports = {\n url: () => ... ,\n action: async (page) => ... ,\n back: async (page) => ... ,\n isPageLoaded: async (page) => {\n await page.waitForNavigation({\n // consider navigation to be finished when there are\n // no more than 2 network connections for at least 500 ms.\n waitUntil: 'networkidle2',\n // Maximum navigation time in milliseconds\n timeout: 5000,\n });\n return true;\n },\n};\n")),(0,r.yg)("ul",null,(0,r.yg)("li",{parentName:"ul"},(0,r.yg)("strong",{parentName:"li"},"Source"),":",(0,r.yg)("ul",{parentName:"li"},(0,r.yg)("li",{parentName:"ul"},(0,r.yg)("a",{parentName:"li",href:"https://github.com/facebook/memlab/blob/eebc764/packages/core/src/lib/Types.ts#L925"},"core/src/lib/Types.ts:925"))))),(0,r.yg)("hr",null),(0,r.yg)("h3",{id:"-optional-leakfilter-leakfiltercallback"},(0,r.yg)("a",{id:"leakfilter",name:"leakfilter"})," ",(0,r.yg)("inlineCode",{parentName:"h3"},"Optional")," ",(0,r.yg)("strong",{parentName:"h3"},"leakFilter"),": ",(0,r.yg)("a",{parentName:"h3",href:"/memlab/docs/api/modules/core_src#leakfiltercallback"},(0,r.yg)("inlineCode",{parentName:"a"},"LeakFilterCallback"))),(0,r.yg)("p",null,"This callback defines how you want to filter out the\nleaked objects. The callback is called for every node (JS heap\nobject in browser) allocated by the ",(0,r.yg)("inlineCode",{parentName:"p"},"action")," callback, but not\nreleased after the ",(0,r.yg)("inlineCode",{parentName:"p"},"back")," callback. Those objects could be caches\nthat are retained in memory on purpose, or they are memory leaks."),(0,r.yg)("p",null,"This optional callback allows you to define your own algorithm\nto cherry pick memory leaks for specific JS program under test."),(0,r.yg)("p",null,"If this optional callback is not defined, memlab will use its\nbuilt-in leak filter, which considers detached DOM elements\nand unmounted Fiber nodes (detached from React Fiber tree) as\nmemory leaks."),(0,r.yg)("ul",null,(0,r.yg)("li",{parentName:"ul"},(0,r.yg)("p",{parentName:"li"},(0,r.yg)("strong",{parentName:"p"},"Parameters"),":"),(0,r.yg)("ul",{parentName:"li"},(0,r.yg)("li",{parentName:"ul"},(0,r.yg)("inlineCode",{parentName:"li"},"node"),": ",(0,r.yg)("code",null,(0,r.yg)("a",{parentName:"li",href:"/memlab/docs/api/interfaces/core_src.IHeapNode"},"IHeapNode"))," | the heap object\nallocated but not released. This filter callback will be applied\nto each node allocated but not released in the heap snapshot."),(0,r.yg)("li",{parentName:"ul"},(0,r.yg)("inlineCode",{parentName:"li"},"snapshot"),": ",(0,r.yg)("code",null,(0,r.yg)("a",{parentName:"li",href:"/memlab/docs/api/interfaces/core_src.IHeapSnapshot"},"IHeapSnapshot"))," | the final heap\nsnapshot taken after all browser interactions are done.\nCheck out ",(0,r.yg)("a",{parentName:"li",href:"/memlab/docs/api/interfaces/core_src.IHeapSnapshot"},"IHeapSnapshot")," for more APIs that queries the\nheap snapshot."),(0,r.yg)("li",{parentName:"ul"},(0,r.yg)("inlineCode",{parentName:"li"},"leakedNodeIds"),": ",(0,r.yg)("inlineCode",{parentName:"li"},"Set")," | the set of ids of all JS heap objects\nallocated by the ",(0,r.yg)("inlineCode",{parentName:"li"},"action")," call but not released after the ",(0,r.yg)("inlineCode",{parentName:"li"},"back")," call\nin browser."))),(0,r.yg)("li",{parentName:"ul"},(0,r.yg)("p",{parentName:"li"},(0,r.yg)("strong",{parentName:"p"},"Returns"),": the boolean value indicating whether the given node in\nthe snapshot should be considered as leaked.")),(0,r.yg)("li",{parentName:"ul"},(0,r.yg)("p",{parentName:"li"},(0,r.yg)("strong",{parentName:"p"},"Examples"),":"))),(0,r.yg)("pre",null,(0,r.yg)("code",{parentName:"pre",className:"language-typescript"},"module.exports = {\n url: () => ... ,\n action: async (page) => ... ,\n back: async (page) => ... ,\n leakFilter(node, snapshot, leakedNodeIds) {\n // any unreleased node (JS heap object) with 1MB+\n // retained size is considered a memory leak\n return node.retainedSize > 1000000;\n },\n};\n")),(0,r.yg)("ul",null,(0,r.yg)("li",{parentName:"ul"},(0,r.yg)("strong",{parentName:"li"},"Source"),":",(0,r.yg)("ul",{parentName:"li"},(0,r.yg)("li",{parentName:"ul"},(0,r.yg)("a",{parentName:"li",href:"https://github.com/facebook/memlab/blob/eebc764/packages/core/src/lib/Types.ts#L998"},"core/src/lib/Types.ts:998"))))),(0,r.yg)("hr",null),(0,r.yg)("h3",{id:"-optional-retainerreferencefilter-referencefiltercallback"},(0,r.yg)("a",{id:"retainerreferencefilter",name:"retainerreferencefilter"})," ",(0,r.yg)("inlineCode",{parentName:"h3"},"Optional")," ",(0,r.yg)("strong",{parentName:"h3"},"retainerReferenceFilter"),": ",(0,r.yg)("a",{parentName:"h3",href:"/memlab/docs/api/modules/core_src#referencefiltercallback"},(0,r.yg)("inlineCode",{parentName:"a"},"ReferenceFilterCallback"))),(0,r.yg)("p",null,"Callback that can be used to define a logic to decide whether\na reference should be considered as part of the retainer trace.\nThe callback is called for every reference (edge) in the heap snapshot."),(0,r.yg)("p",null,"For concrete examples, check out ",(0,r.yg)("a",{parentName:"p",href:"/memlab/docs/api/interfaces/core_src.IScenario#leakfilter"},"leakFilter"),"."),(0,r.yg)("ul",null,(0,r.yg)("li",{parentName:"ul"},(0,r.yg)("p",{parentName:"li"},(0,r.yg)("strong",{parentName:"p"},"Parameters"),":"),(0,r.yg)("ul",{parentName:"li"},(0,r.yg)("li",{parentName:"ul"},(0,r.yg)("inlineCode",{parentName:"li"},"edge")," : ",(0,r.yg)("code",null,(0,r.yg)("a",{parentName:"li",href:"/memlab/docs/api/interfaces/core_src.IHeapEdge"},"IHeapEdge"))," | the reference (edge)\nthat is considered for calcualting the retainer trace"),(0,r.yg)("li",{parentName:"ul"},(0,r.yg)("inlineCode",{parentName:"li"},"snapshot"),": ",(0,r.yg)("code",null,(0,r.yg)("a",{parentName:"li",href:"/memlab/docs/api/interfaces/core_src.IHeapSnapshot"},"IHeapSnapshot"))," | the heap snapshot\ntaken after all browser interactions are done.\nCheck out ",(0,r.yg)("a",{parentName:"li",href:"/memlab/docs/api/interfaces/core_src.IHeapSnapshot"},"IHeapSnapshot")," for more APIs that queries the\nheap snapshot."),(0,r.yg)("li",{parentName:"ul"},(0,r.yg)("inlineCode",{parentName:"li"},"isReferenceUsedByDefault"),": ",(0,r.yg)("inlineCode",{parentName:"li"},"boolean")," | MemLab has its own default\nlogic for whether a reference should be considered as part of the\nretainer trace, if this parameter is true, it means MemLab will\nconsider this reference when calculating the retainer trace."))),(0,r.yg)("li",{parentName:"ul"},(0,r.yg)("p",{parentName:"li"},(0,r.yg)("strong",{parentName:"p"},"Returns"),": the value indicating whether the given reference should be\nconsidered when calculating the retainer trace. Note that when this\ncallback returns true, the reference will only be considered as a candidate\nfor retainer trace, so it may or may not be included in the retainer trace;\nhowever, if this callback returns false, the reference will be excluded."))),(0,r.yg)("p",null,"Note that by excluding a dominator reference of an object (i.e., an edge\nthat must be traveled through to reach the heap object from GC roots),\nthe object will be considered as unreachable in the heap graph; and\ntherefore, the reference and heap object will not be included in the\nretainer trace detection and retainer size calculation."),(0,r.yg)("ul",null,(0,r.yg)("li",{parentName:"ul"},(0,r.yg)("strong",{parentName:"li"},"Examples"),":")),(0,r.yg)("pre",null,(0,r.yg)("code",{parentName:"pre",className:"language-javascript"},"// save as leak-filter.js\nmodule.exports = {\n retainerReferenceFilter(edge, _snapshot, _leakedNodeIds) {\n // exclude react fiber references\n if (edge.name_or_index.toString().startsWith('__reactFiber$')) {\n return false;\n }\n return true;\n }\n};\n")),(0,r.yg)("ul",null,(0,r.yg)("li",{parentName:"ul"},(0,r.yg)("strong",{parentName:"li"},"Source"),":",(0,r.yg)("ul",{parentName:"li"},(0,r.yg)("li",{parentName:"ul"},(0,r.yg)("a",{parentName:"li",href:"https://github.com/facebook/memlab/blob/eebc764/packages/core/src/lib/Types.ts#L1044"},"core/src/lib/Types.ts:1044"))))),(0,r.yg)("hr",null),(0,r.yg)("h3",{id:"-optional-setup-interactionscallback"},(0,r.yg)("a",{id:"setup",name:"setup"})," ",(0,r.yg)("inlineCode",{parentName:"h3"},"Optional")," ",(0,r.yg)("strong",{parentName:"h3"},"setup"),": ",(0,r.yg)("a",{parentName:"h3",href:"/memlab/docs/api/modules/core_src#interactionscallback"},(0,r.yg)("inlineCode",{parentName:"a"},"InteractionsCallback"))),(0,r.yg)("p",null,(0,r.yg)("inlineCode",{parentName:"p"},"setup")," is the callback function that will be called only once\nafter the initial page load. 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To import\nthis type, check out ",(0,r.yg)("a",{parentName:"li",href:"/memlab/docs/api/modules/core_src#page"},"Page"),"."))),(0,r.yg)("li",{parentName:"ul"},(0,r.yg)("p",{parentName:"li"},(0,r.yg)("strong",{parentName:"p"},"Examples"),":"))),(0,r.yg)("pre",null,(0,r.yg)("code",{parentName:"pre",className:"language-typescript"},"const scenario = {\n url: () => 'https://www.npmjs.com/',\n setup: async (page) => {\n // log in or prepare data for the interaction\n },\n action: async (page) => {\n await page.click('a[href=\"/link\"]');\n },\n back: async (page) => {\n await page.click('a[href=\"/back\"]');\n },\n}\n\nmodule.exports = scenario;\n")),(0,r.yg)("ul",null,(0,r.yg)("li",{parentName:"ul"},(0,r.yg)("strong",{parentName:"li"},"Source"),":",(0,r.yg)("ul",{parentName:"li"},(0,r.yg)("li",{parentName:"ul"},(0,r.yg)("a",{parentName:"li",href:"https://github.com/facebook/memlab/blob/eebc764/packages/core/src/lib/Types.ts#L794"},"core/src/lib/Types.ts:794"))))),(0,r.yg)("h2",{id:"methods"},"Methods"),(0,r.yg)("h3",{id:"optional-cookies"},(0,r.yg)("a",{id:"cookies"}),(0,r.yg)("inlineCode",{parentName:"h3"},"Optional")," ",(0,r.yg)("strong",{parentName:"h3"},"cookies"),"()"),(0,r.yg)("p",null,"If the page you are running memlab against requires authentication or\nspecific cookie(s) to be set, you can pass them as\na list of ",(0,r.yg)("inlineCode",{parentName:"p"},"")," tuples."),(0,r.yg)("p",null,(0,r.yg)("strong",{parentName:"p"},"Note"),": please make sure that you provide the correct ",(0,r.yg)("inlineCode",{parentName:"p"},"domain")," field for\nthe cookies tuples. 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b=new Promise(((t,b)=>f=e[a]=[t,b]));t.push(f[2]=b);var r=d.p+d.u(a),c=new Error;d.l(r,(t=>{if(d.o(e,a)&&(0!==(f=e[a])&&(e[a]=void 0),f)){var b=t&&("load"===t.type?"missing":t.type),r=t&&t.target&&t.target.src;c.message="Loading chunk "+a+" failed.\n("+b+": "+r+")",c.name="ChunkLoadError",c.type=b,c.request=r,f[1](c)}}),"chunk-"+a,a)}},d.O.j=a=>0===e[a];var a=(a,t)=>{var f,b,r=t[0],c=t[1],o=t[2],n=0;if(r.some((a=>0!==e[a]))){for(f in c)d.o(c,f)&&(d.m[f]=c[f]);if(o)var i=o(d)}for(a&&a(t);n Class: BrowserInteractionResultReader | memlab - +

Class: BrowserInteractionResultReader

A utility entity to read all generated files from the directory holding the data and results from the -last MemLab browser interaction run

Hierarchy​

  • default

    ↳ BrowserInteractionResultReader

Methods​

cleanup()​

clean up data/files generated from the memlab browser interaction run

  • Returns: void | no return value
  • Examples:
const {takeSnapshots} = require('@memlab/api');

(async function () {
  const scenario = { url: () => 'https://www.npmjs.com'};
  const result = await takeSnapshots({scenario});

  // delete all data/files generated by takeSnapshots
  result.cleanup();
})();

getConsoleBackupFile()​

This method gets the backup file of the console output.

The memlab CLI commands (e.g., memlab find-leaks) outputs a +last MemLab browser interaction run

Hierarchy​

  • default

    ↳ BrowserInteractionResultReader

Methods​

cleanup()​

clean up data/files generated from the memlab browser interaction run

  • Returns: void | no return value
  • Examples:
const {takeSnapshots} = require('@memlab/api');

(async function () {
  const scenario = { url: () => 'https://www.npmjs.com'};
  const result = await takeSnapshots({scenario});

  // delete all data/files generated by takeSnapshots
  result.cleanup();
})();

getConsoleBackupFile()​

This method gets the backup file of the console output.

The memlab CLI commands (e.g., memlab find-leaks) outputs a non-structured string representation for easy reading, while the APIs (e.g., findLeaks) return structured leaks representation that is handy for post-processing. If you need to obtain all the string output from the CLI in the current working directory, -you can read them from the CLI output backup file returned by this method.

  • Returns: string | the absolute path of the backup file
  • Examples:
const {takeSnapshots, findLeaks} = require('@memlab/api');

(async function () {
  const scenario = { url: () => 'https://www.npmjs.com'};
  const result = await takeSnapshots({scenario});
  const leaks = await findLeaks(result);

  // get the console output backup file
  const consoleBackupFile = result.getConsoleBackupFile();
})();

getInteractionSteps()​

browser interaction step sequence

  • Returns: E2EStepInfo[] | an array of browser interaction step information
  • Examples:
const {takeSnapshots} = require('@memlab/api');

(async function () {
  const scenario = { url: () => 'https://www.npmjs.com'};
  const result = await takeSnapshots({scenario});

  const steps = result.getInteractionSteps();
  // print each browser interaction's name and JavaScript heap size (in bytes)
  steps.forEach(step => console.log(step.name, step.JSHeapUsedSize))
})();

getRootDirectory()​

get the directory where the data and generated files of -the memlab run were stored

  • Returns: string | absolute path of the directory
  • Examples:
const {takeSnapshots} = require('@memlab/api');

(async function () {
  const scenario = { url: () => 'https://www.npmjs.com'};
  const result = await takeSnapshots({scenario});

  // get the directory that stores all the files
  // generated from the takeSnapshots call
  const dataDir = result.getRootDirectory();
})();

getRunMetaInfo()​

general meta data of the browser interaction run

  • Returns: RunMetaInfo | meta data about the entire browser interaction
  • Examples:
const {takeSnapshots} = require('@memlab/api');

(async function () {
  const scenario = { url: () => 'https://www.npmjs.com'};
  const result = await takeSnapshots({scenario});

  const metaInfo = result.getRunMetaInfo();
  // print all browser web console output
  console.log(metaInfo.browserInfo._consoleMessages.join('\n'));
})();

getSnapshotFileDir()​

get the directory holding all snapshot files

  • Returns: string | the absolute path of the directory
  • Examples:
const {takeSnapshots} = require('@memlab/api');

(async function () {
  const scenario = { url: () => 'https://www.npmjs.com'};
  const result = await takeSnapshots({scenario});

  // get the absolute path the directory holding all snapshot files
  const files = result.getSnapshotFileDir();
})();

getSnapshotFiles()​

get all snapshot files generated from last memlab browser interaction

  • Returns: string[] | an array of snapshot file's absolute path
  • Examples:
const {takeSnapshots} = require('@memlab/api');

(async function () {
  const scenario = { url: () => 'https://www.npmjs.com'};
  const result = await takeSnapshots({scenario});

  // get absolute paths of all snapshot files
  const files = result.getSnapshotFiles();
})();

Static from(workDir?)​

build a result reader from a data directory where the data -and generated files of a memlab run were stored

const {BrowserInteractionResultReader} = require('@memlab/api');

const dataDir = '/tmp/memlab'; // where the last memlab run stores results
const reader = BrowserInteractionResultReader.from(dataDir);
reader.cleanup(); // clean up the results
  • Hierarchy
  • Methods
    • cleanup()
    • getConsoleBackupFile()
    • getInteractionSteps()
    • getRootDirectory()
    • getRunMetaInfo()
    • getSnapshotFileDir()
    • getSnapshotFiles()
    • Static from(workDir?)
Guides
Community
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Legal
Copyright © 2024 +you can read them from the CLI output backup file returned by this method.

  • Returns: string | the absolute path of the backup file
  • Examples:
const {takeSnapshots, findLeaks} = require('@memlab/api');

(async function () {
  const scenario = { url: () => 'https://www.npmjs.com'};
  const result = await takeSnapshots({scenario});
  const leaks = await findLeaks(result);

  // get the console output backup file
  const consoleBackupFile = result.getConsoleBackupFile();
})();

getInteractionSteps()​

browser interaction step sequence

  • Returns: E2EStepInfo[] | an array of browser interaction step information
  • Examples:
const {takeSnapshots} = require('@memlab/api');

(async function () {
  const scenario = { url: () => 'https://www.npmjs.com'};
  const result = await takeSnapshots({scenario});

  const steps = result.getInteractionSteps();
  // print each browser interaction's name and JavaScript heap size (in bytes)
  steps.forEach(step => console.log(step.name, step.JSHeapUsedSize))
})();

getRootDirectory()​

get the directory where the data and generated files of +the memlab run were stored

  • Returns: string | absolute path of the directory
  • Examples:
const {takeSnapshots} = require('@memlab/api');

(async function () {
  const scenario = { url: () => 'https://www.npmjs.com'};
  const result = await takeSnapshots({scenario});

  // get the directory that stores all the files
  // generated from the takeSnapshots call
  const dataDir = result.getRootDirectory();
})();

getRunMetaInfo()​

general meta data of the browser interaction run

  • Returns: RunMetaInfo | meta data about the entire browser interaction
  • Examples:
const {takeSnapshots} = require('@memlab/api');

(async function () {
  const scenario = { url: () => 'https://www.npmjs.com'};
  const result = await takeSnapshots({scenario});

  const metaInfo = result.getRunMetaInfo();
  // print all browser web console output
  console.log(metaInfo.browserInfo._consoleMessages.join('\n'));
})();

getSnapshotFileDir()​

get the directory holding all snapshot files

  • Returns: string | the absolute path of the directory
  • Examples:
const {takeSnapshots} = require('@memlab/api');

(async function () {
  const scenario = { url: () => 'https://www.npmjs.com'};
  const result = await takeSnapshots({scenario});

  // get the absolute path the directory holding all snapshot files
  const files = result.getSnapshotFileDir();
})();

getSnapshotFiles()​

get all snapshot files generated from last memlab browser interaction

  • Returns: string[] | an array of snapshot file's absolute path
  • Examples:
const {takeSnapshots} = require('@memlab/api');

(async function () {
  const scenario = { url: () => 'https://www.npmjs.com'};
  const result = await takeSnapshots({scenario});

  // get absolute paths of all snapshot files
  const files = result.getSnapshotFiles();
})();

Static from(workDir?)​

build a result reader from a data directory where the data +and generated files of a memlab run were stored

const {BrowserInteractionResultReader} = require('@memlab/api');

const dataDir = '/tmp/memlab'; // where the last memlab run stores results
const reader = BrowserInteractionResultReader.from(dataDir);
reader.cleanup(); // clean up the results
  • Hierarchy
  • Methods
    • cleanup()
    • getConsoleBackupFile()
    • getInteractionSteps()
    • getRootDirectory()
    • getRunMetaInfo()
    • getSnapshotFileDir()
    • getSnapshotFiles()
    • Static from(workDir?)
- + \ No newline at end of file diff --git a/docs/api/classes/api_src.SnapshotResultReader/index.html b/docs/api/classes/api_src.SnapshotResultReader/index.html index 28358996..a0e07fb8 100644 --- a/docs/api/classes/api_src.SnapshotResultReader/index.html +++ b/docs/api/classes/api_src.SnapshotResultReader/index.html @@ -10,7 +10,7 @@ Class: SnapshotResultReader | memlab - + @@ -24,11 +24,11 @@ APIs (e.g., findLeaks) return structured leaks representation that is handy for post-processing. If you need to obtain all the string output from the CLI in the current working directory, -you can read them from the CLI output backup file returned by this method.

  • Returns: string | the absolute path of the backup file
  • Examples:
const {takeSnapshots, findLeaks} = require('@memlab/api');

(async function () {
  const scenario = { url: () => 'https://www.npmjs.com'};
  const result = await takeSnapshots({scenario});
  const leaks = await findLeaks(result);

  // get the console output backup file
  const consoleBackupFile = result.getConsoleBackupFile();
})();

getInteractionSteps()​

browser interaction step sequence

  • Returns: E2EStepInfo[] | an array of browser interaction step information

  • Examples:

const {SnapshotResultReader} = require('@memlab/api');

// baseline, target, and final are file paths of heap snapshot files
const reader = SnapshotResultReader.fromSnapshots(baseline, target, final);
const paths = reader.getInteractionSteps();

getRootDirectory()​

get the directory where the data and generated files of -the memlab run were stored

  • Returns: string | absolute path of the directory
  • Examples:
const {takeSnapshots} = require('@memlab/api');

(async function () {
  const scenario = { url: () => 'https://www.npmjs.com'};
  const result = await takeSnapshots({scenario});

  // get the directory that stores all the files
  // generated from the takeSnapshots call
  const dataDir = result.getRootDirectory();
})();

getSnapshotFiles()​

get all snapshot files related to this SnapshotResultReader

  • Returns: string[] | an array of snapshot file's absolute path

  • Examples:

const {SnapshotResultReader} = require('@memlab/api');

// baseline, target, and final are file paths of heap snapshot files
const reader = SnapshotResultReader.fromSnapshots(baseline, target, final);
const paths = reader.getSnapshotFiles();

Static fromSnapshots(baselineSnapshot, targetSnapshot, finalSnapshot)​

Build a result reader from baseline, target, and final heap snapshot files. -The three snapshot files do not have to be in the same directory.

  • Parameters:

    • baselineSnapshot: string | file path of the baseline heap snapshot
    • targetSnapshot: string | file path of the target heap snapshot
    • finalSnapshot: string | file path of the final heap snapshot

  • Returns: SnapshotResultReader | the ResultReader instance

  • Examples:

const {SnapshotResultReader, findLeaks} = require('@memlab/api');

// baseline, target, and final are file paths of heap snapshot files
const reader = SnapshotResultReader.fromSnapshots(baseline, target, final);
const leaks = await findLeaks(reader);
  • Hierarchy
  • Methods
    • getConsoleBackupFile()
    • getInteractionSteps()
    • getRootDirectory()
    • getSnapshotFiles()
    • Static fromSnapshots(baselineSnapshot, targetSnapshot, finalSnapshot)