환경설정: msw 설치 및 환경설정

next.config.js

@@ -5,4 +5,20 @@ module.exports = {
   sassOptions: {
     includePaths: [path.join(__dirname, 'styles')],
   },
+  webpack: (config, context) => {
+    if (context?.isServer) {
+      if (Array.isArray(config.resolve.alias)) {
+        config.resolve.alias.push({ name: "msw/browser", alias: false })
+      } else {
+        config.resolve.alias["msw/browser"] = false
+      }
+    } else {
+      if (Array.isArray(config.resolve.alias)) {
+        config.resolve.alias.push({ name: "msw/node", alias: false })
+      } else {
+        config.resolve.alias["msw/node"] = false
+      }
+    }
+    return config
+  },
 }

package.json

@@ -58,6 +58,7 @@
     "eslint-plugin-react-hooks": "^4.6.0",
     "eslint-plugin-storybook": "^0.6.15",
     "jsdom": "^23.2.0",
+    "msw": "^2.0.13",
     "sass": "^1.69.6",
     "storybook": "^7.6.6",
     "storybook-react-context": "^0.6.0",
@@ -68,5 +69,8 @@
     "vitest": "^1.1.3"
   },
   "readme": "ERROR: No README data found!",
-  "_id": "[email protected]"
+  "_id": "[email protected]",
+  "msw": {
+    "workerDirectory": "public"
+  }
 }

public/mockServiceWorker.js

@@ -0,0 +1,287 @@
+/* eslint-disable */
+/* tslint:disable */
+
+/**
+ * Mock Service Worker (2.0.13).
+ * @see https://github.com/mswjs/msw
+ * - Please do NOT modify this file.
+ * - Please do NOT serve this file on production.
+ */
+
+const INTEGRITY_CHECKSUM = 'c5f7f8e188b673ea4e677df7ea3c5a39'
+const IS_MOCKED_RESPONSE = Symbol('isMockedResponse')
+const activeClientIds = new Set()
+
+self.addEventListener('install', function () {
+  self.skipWaiting()
+})
+
+self.addEventListener('activate', function (event) {
+  event.waitUntil(self.clients.claim())
+})
+
+self.addEventListener('message', async function (event) {
+  const clientId = event.source.id
+
+  if (!clientId || !self.clients) {
+    return
+  }
+
+  const client = await self.clients.get(clientId)
+
+  if (!client) {
+    return
+  }
+
+  const allClients = await self.clients.matchAll({
+    type: 'window',
+  })
+
+  switch (event.data) {
+    case 'KEEPALIVE_REQUEST': {
+      sendToClient(client, {
+        type: 'KEEPALIVE_RESPONSE',
+      })
+      break
+    }
+
+    case 'INTEGRITY_CHECK_REQUEST': {
+      sendToClient(client, {
+        type: 'INTEGRITY_CHECK_RESPONSE',
+        payload: INTEGRITY_CHECKSUM,
+      })
+      break
+    }
+
+    case 'MOCK_ACTIVATE': {
+      activeClientIds.add(clientId)
+
+      sendToClient(client, {
+        type: 'MOCKING_ENABLED',
+        payload: true,
+      })
+      break
+    }
+
+    case 'MOCK_DEACTIVATE': {
+      activeClientIds.delete(clientId)
+      break
+    }
+
+    case 'CLIENT_CLOSED': {
+      activeClientIds.delete(clientId)
+
+      const remainingClients = allClients.filter((client) => {
+        return client.id !== clientId
+      })
+
+      // Unregister itself when there are no more clients
+      if (remainingClients.length === 0) {
+        self.registration.unregister()
+      }
+
+      break
+    }
+  }
+})
+
+self.addEventListener('fetch', function (event) {
+  const { request } = event
+
+  // Bypass navigation requests.
+  if (request.mode === 'navigate') {
+    return
+  }
+
+  // Opening the DevTools triggers the "only-if-cached" request
+  // that cannot be handled by the worker. Bypass such requests.
+  if (request.cache === 'only-if-cached' && request.mode !== 'same-origin') {
+    return
+  }
+
+  // Bypass all requests when there are no active clients.
+  // Prevents the self-unregistered worked from handling requests
+  // after it's been deleted (still remains active until the next reload).
+  if (activeClientIds.size === 0) {
+    return
+  }
+
+  // Generate unique request ID.
+  const requestId = crypto.randomUUID()
+  event.respondWith(handleRequest(event, requestId))
+})
+
+async function handleRequest(event, requestId) {
+  const client = await resolveMainClient(event)
+  const response = await getResponse(event, client, requestId)
+
+  // Send back the response clone for the "response:*" life-cycle events.
+  // Ensure MSW is active and ready to handle the message, otherwise
+  // this message will pend indefinitely.
+  if (client && activeClientIds.has(client.id)) {
+    ;(async function () {
+      const responseClone = response.clone()
+
+      sendToClient(
+        client,
+        {
+          type: 'RESPONSE',
+          payload: {
+            requestId,
+            isMockedResponse: IS_MOCKED_RESPONSE in response,
+            type: responseClone.type,
+            status: responseClone.status,
+            statusText: responseClone.statusText,
+            body: responseClone.body,
+            headers: Object.fromEntries(responseClone.headers.entries()),
+          },
+        },
+        [responseClone.body],
+      )
+    })()
+  }
+
+  return response
+}
+
+// Resolve the main client for the given event.
+// Client that issues a request doesn't necessarily equal the client
+// that registered the worker. It's with the latter the worker should
+// communicate with during the response resolving phase.
+async function resolveMainClient(event) {
+  const client = await self.clients.get(event.clientId)
+
+  if (client?.frameType === 'top-level') {
+    return client
+  }
+
+  const allClients = await self.clients.matchAll({
+    type: 'window',
+  })
+
+  return allClients
+    .filter((client) => {
+      // Get only those clients that are currently visible.
+      return client.visibilityState === 'visible'
+    })
+    .find((client) => {
+      // Find the client ID that's recorded in the
+      // set of clients that have registered the worker.
+      return activeClientIds.has(client.id)
+    })
+}
+
+async function getResponse(event, client, requestId) {
+  const { request } = event
+
+  // Clone the request because it might've been already used
+  // (i.e. its body has been read and sent to the client).
+  const requestClone = request.clone()
+
+  function passthrough() {
+    const headers = Object.fromEntries(requestClone.headers.entries())
+
+    // Remove internal MSW request header so the passthrough request
+    // complies with any potential CORS preflight checks on the server.
+    // Some servers forbid unknown request headers.
+    delete headers['x-msw-intention']
+
+    return fetch(requestClone, { headers })
+  }
+
+  // Bypass mocking when the client is not active.
+  if (!client) {
+    return passthrough()
+  }
+
+  // Bypass initial page load requests (i.e. static assets).
+  // The absence of the immediate/parent client in the map of the active clients
+  // means that MSW hasn't dispatched the "MOCK_ACTIVATE" event yet
+  // and is not ready to handle requests.
+  if (!activeClientIds.has(client.id)) {
+    return passthrough()
+  }
+
+  // Bypass requests with the explicit bypass header.
+  // Such requests can be issued by "ctx.fetch()".
+  const mswIntention = request.headers.get('x-msw-intention')
+  if (['bypass', 'passthrough'].includes(mswIntention)) {
+    return passthrough()
+  }
+
+  // Notify the client that a request has been intercepted.
+  const requestBuffer = await request.arrayBuffer()
+  const clientMessage = await sendToClient(
+    client,
+    {
+      type: 'REQUEST',
+      payload: {
+        id: requestId,
+        url: request.url,
+        mode: request.mode,
+        method: request.method,
+        headers: Object.fromEntries(request.headers.entries()),
+        cache: request.cache,
+        credentials: request.credentials,
+        destination: request.destination,
+        integrity: request.integrity,
+        redirect: request.redirect,
+        referrer: request.referrer,
+        referrerPolicy: request.referrerPolicy,
+        body: requestBuffer,
+        keepalive: request.keepalive,
+      },
+    },
+    [requestBuffer],
+  )
+
+  switch (clientMessage.type) {
+    case 'MOCK_RESPONSE': {
+      return respondWithMock(clientMessage.data)
+    }
+
+    case 'MOCK_NOT_FOUND': {
+      return passthrough()
+    }
+  }
+
+  return passthrough()
+}
+
+function sendToClient(client, message, transferrables = []) {
+  return new Promise((resolve, reject) => {
+    const channel = new MessageChannel()
+
+    channel.port1.onmessage = (event) => {
+      if (event.data && event.data.error) {
+        return reject(event.data.error)
+      }
+
+      resolve(event.data)
+    }
+
+    client.postMessage(
+      message,
+      [channel.port2].concat(transferrables.filter(Boolean)),
+    )
+  })
+}
+
+async function respondWithMock(response) {
+  // Setting response status code to 0 is a no-op.
+  // However, when responding with a "Response.error()", the produced Response
+  // instance will have status code set to 0. Since it's not possible to create
+  // a Response instance with status code 0, handle that use-case separately.
+  if (response.status === 0) {
+    return Response.error()
+  }
+
+  const mockedResponse = new Response(response.body, response)
+
+  Reflect.defineProperty(mockedResponse, IS_MOCKED_RESPONSE, {
+    value: true,
+    enumerable: true,
+  })
+
+  return mockedResponse
+}

src/app/layout.tsx

@@ -5,6 +5,7 @@ import localFont from 'next/font/local';
 import './globals.css';
 
 import { ModalContextProvider } from '@contexts/ModalContext';
+import MswProviders from '@providers/MswProvider';
 import StoreProvider from '@providers/StoreProvider';
 import TanstackQueryProvider from '@providers/TanstackQueryProvider';
 
@@ -31,13 +32,15 @@ export default function RootLayout({
   return (
     <html lang="ko">
       <body className={pretendard.className}>
-        <TanstackQueryProvider>
-          <StoreProvider>
-            <ModalContextProvider>
-              {children}
-            </ModalContextProvider>
-          </StoreProvider>
-        </TanstackQueryProvider>
+        <MswProviders>
+          <TanstackQueryProvider>
+            <StoreProvider>
+              <ModalContextProvider>
+                {children}
+              </ModalContextProvider>
+            </StoreProvider>
+          </TanstackQueryProvider>
+        </MswProviders>
         <div id="modal-root" />
         <div id="drawer-root" />
       </body>

src/mocks/browser.ts

@@ -0,0 +1,6 @@
+// eslint-disable-next-line import/no-extraneous-dependencies
+import { setupWorker } from 'msw/browser';
+
+import { handlers } from './handlers';
+
+export const worker = setupWorker(...handlers);

src/mocks/handlers.ts

@@ -0,0 +1,8 @@
+// eslint-disable-next-line import/no-extraneous-dependencies
+import { http, HttpResponse } from 'msw';
+
+export const handlers = [
+  http.get('http://localhost:3030/test', () => {
+    return HttpResponse.json(['사과', '배']);
+  }),
+];

src/mocks/index.ts

@@ -0,0 +1,12 @@
+const initMocks = async () => {
+  const isServer = typeof window === 'undefined';
+
+  if (isServer) {
+    const { server } = await import('./server');
+    server.listen({ onUnhandledRequest: 'bypass' }); // 처리되지 않은 요청이라도 통과시키도록
+  } else {
+    const { worker } = await import('./browser');
+    await worker.start({ onUnhandledRequest: 'bypass' }); // 처리되지 않은 요청이라도 통과시키도록
+  }
+};
+export default initMocks;

src/mocks/server.ts

@@ -0,0 +1,6 @@
+// eslint-disable-next-line import/no-extraneous-dependencies
+import { setupServer } from 'msw/node';
+
+import { handlers } from './handlers';
+
+export const server = setupServer(...handlers);