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This feature is to create an eslintcache that can be shared across de…
…velopers or into ci machines.
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| Repo: eslint/eslint | ||
| - Start Date: 2023-02-14 | ||
| - RFC PR: <https://github.com/eslint/rfcs/pull/106> | ||
| - Authors: Christian Schulz (@cschulz)i and cs6cs6 | ||
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| # Relative cache location strategy | ||
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| ## Summary | ||
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| To be able to share the created eslint cache between different systems f.e. local machine and CI, there is a need for a relative path stored in the cache. | ||
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| ## Motivation | ||
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| The overall motivation for doing this is performance during the eslint process. | ||
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| Most people are running eslint on local developer machine and additional on the CI workers. | ||
| In high changing repositories there are several pull requests at the same time changing different files requiring linting all the time. | ||
| This is a time consuming process depending on the enabled rules like type checking rules. | ||
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| If the CI worker is able to cache its last run, it can just pick this cache up and use it. | ||
| Also developers can reuse this cache or commit it as part of a repository for the CI. | ||
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| ## Detailed Design | ||
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| I have a branch with the following design already. It is not fully tested, so I'm not 100% sure this will be the final implementation but I think it is a good start. | ||
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| The LintResultCache takes a file path as parameter to find or store a file cache entry. | ||
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| One approach would be to truncate the given absolute path of the file by the path of the cache location. | ||
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| ### Adding the command line parameter | ||
| - conf/default-cli-options.js: add the property 'shearableCache' with a default of false. It should be put in the section with the other cache variables, below cacheStrategy. | ||
| - docs/src/use/command-line-interface.md: Add an explanation of the 'shareable-cache' variable with the other cache variables: "By default, an eslintcache contains full file paths and thus cannot readily be shared across developers or ci machines. "False" is that default. "True" changes the internal storage to store a relative path to the process execution directory, thus making the eslintcache shareable across developers and ci machines. . If you change this setting, you must regenerate your entire eslint cache." | ||
| - eslint-helpers.js: add shareableCache variable (set to false) to the processOptions | ||
| - lib/options.js: Add an option 'shareable-cache' of type Boolean with a nice description for people to read: By default, an eslintcache contains full file paths and thus cannot readily be shared across developers or ci machines. "False" is that default. "True" changes the internal storage to store a relative path to the process execution directory, thus making the eslintcache shareable across developers and ci machines. . If you change this setting, you must regenerate your entire eslint cache. | ||
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| ### Changing cache file serialization | ||
| - lib/eslint/flat-eslint.js: Define the shearableCache property at the top, with the other properties, as a boolean | ||
| - lib/eslint/flat-eslint.js: Around line 873, where the flat-eslint.js file is saving the cache in the cachefile, if processOptions.shareableCache is set to true, pass a PARTIAL path to the lintResultCache.setCachedLintResults() function instead of the full path. | ||
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| ## Documentation | ||
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| Add the new CLI flag to the CLI documentation. The new cli flag will be called shareable-cache. | ||
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| ## Drawbacks | ||
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| No. | ||
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| ## Backwards Compatibility Analysis | ||
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| The new flag, shareable-cache, passed in on the command line, will default to false. Unless people explicitly set it to true, then the old algorithms will | ||
| be used. They will not need to regenerate their cache unless they set this flag. | ||
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| ## Alternatives | ||
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| A CLI tool which translates the existing cache to the current folder structure. | ||
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| ## Open Questions | ||
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| No. | ||
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| ## Help Needed | ||
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| I have a branch with code changes, but I am trying to figure out how to build an artifact to test with. Using the eslint.js artifact in the browser does not make sense | ||
| with a cache change, and I would like to test it in my project. How can I build a package that I can install with NPM into my project to test?? I am able to run the tests | ||
| on the eslintproject and they all pass. My fork is here: https://github.com/cs6cs6/eslint_patch/tree/fork/shareable-eslintcache | ||
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| ## Frequently Asked Questions | ||
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| TBD | ||
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| ## Related Discussions | ||
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| [Change Request: Eslintcache relative #16493](https://github.com/eslint/eslint/issues/16493) |