Add Example01 scaffold

package.json

@@ -56,5 +56,8 @@
       "last 1 firefox version",
       "last 1 safari version"
     ]
+  },
+  "msw": {
+    "workerDirectory": "public"
   }
-}
+}

public/mockServiceWorker.js

@@ -0,0 +1,322 @@
+/**
+ * Mock Service Worker.
+ * @see https://github.com/mswjs/msw
+ * - Please do NOT modify this file.
+ * - Please do NOT serve this file on production.
+ */
+/* eslint-disable */
+/* tslint:disable */
+
+const INTEGRITY_CHECKSUM = '795882c72c7304f6fa1d4a65a2418900'
+const bypassHeaderName = 'x-msw-bypass'
+const activeClientIds = new Set()
+
+self.addEventListener('install', function () {
+  return self.skipWaiting()
+})
+
+self.addEventListener('activate', async function (event) {
+  return 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()
+
+  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
+    }
+  }
+})
+
+// Resolve the "master" 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 resolveMasterClient(event) {
+  const client = await self.clients.get(event.clientId)
+
+  if (client.frameType === 'top-level') {
+    return client
+  }
+
+  const allClients = await self.clients.matchAll()
+
+  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 handleRequest(event, requestId) {
+  const client = await resolveMasterClient(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 (activeClientIds.has(client.id)) {
+    ;(async function () {
+      const clonedResponse = response.clone()
+      sendToClient(client, {
+        type: 'RESPONSE',
+        payload: {
+          requestId,
+          type: clonedResponse.type,
+          ok: clonedResponse.ok,
+          status: clonedResponse.status,
+          statusText: clonedResponse.statusText,
+          body:
+            clonedResponse.body === null ? null : await clonedResponse.text(),
+          headers: serializeHeaders(clonedResponse.headers),
+          redirected: clonedResponse.redirected,
+        },
+      })
+    })()
+  }
+
+  return response
+}
+
+async function getResponse(event, client, requestId) {
+  const { request } = event
+  const requestClone = request.clone()
+  const getOriginalResponse = () => fetch(requestClone)
+
+  // Bypass mocking when the request client is not active.
+  if (!client) {
+    return getOriginalResponse()
+  }
+
+  // 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 await getOriginalResponse()
+  }
+
+  // Bypass requests with the explicit bypass header
+  if (requestClone.headers.get(bypassHeaderName) === 'true') {
+    const cleanRequestHeaders = serializeHeaders(requestClone.headers)
+
+    // Remove the bypass header to comply with the CORS preflight check.
+    delete cleanRequestHeaders[bypassHeaderName]
+
+    const originalRequest = new Request(requestClone, {
+      headers: new Headers(cleanRequestHeaders),
+    })
+
+    return fetch(originalRequest)
+  }
+
+  // Send the request to the client-side MSW.
+  const reqHeaders = serializeHeaders(request.headers)
+  const body = await request.text()
+
+  const clientMessage = await sendToClient(client, {
+    type: 'REQUEST',
+    payload: {
+      id: requestId,
+      url: request.url,
+      method: request.method,
+      headers: reqHeaders,
+      cache: request.cache,
+      mode: request.mode,
+      credentials: request.credentials,
+      destination: request.destination,
+      integrity: request.integrity,
+      redirect: request.redirect,
+      referrer: request.referrer,
+      referrerPolicy: request.referrerPolicy,
+      body,
+      bodyUsed: request.bodyUsed,
+      keepalive: request.keepalive,
+    },
+  })
+
+  switch (clientMessage.type) {
+    case 'MOCK_SUCCESS': {
+      return delayPromise(
+        () => respondWithMock(clientMessage),
+        clientMessage.payload.delay,
+      )
+    }
+
+    case 'MOCK_NOT_FOUND': {
+      return getOriginalResponse()
+    }
+
+    case 'NETWORK_ERROR': {
+      const { name, message } = clientMessage.payload
+      const networkError = new Error(message)
+      networkError.name = name
+
+      // Rejecting a request Promise emulates a network error.
+      throw networkError
+    }
+
+    case 'INTERNAL_ERROR': {
+      const parsedBody = JSON.parse(clientMessage.payload.body)
+
+      console.error(
+        `\
+[MSW] Request handler function for "%s %s" has thrown the following exception:
+
+${parsedBody.errorType}: ${parsedBody.message}
+(see more detailed error stack trace in the mocked response body)
+
+This exception has been gracefully handled as a 500 response, however, it's strongly recommended to resolve this error.
+If you wish to mock an error response, please refer to this guide: https://mswjs.io/docs/recipes/mocking-error-responses\
+`,
+        request.method,
+        request.url,
+      )
+
+      return respondWithMock(clientMessage)
+    }
+  }
+
+  return getOriginalResponse()
+}
+
+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
+  }
+
+  const requestId = uuidv4()
+
+  return event.respondWith(
+    handleRequest(event, requestId).catch((error) => {
+      console.error(
+        '[MSW] Failed to mock a "%s" request to "%s": %s',
+        request.method,
+        request.url,
+        error,
+      )
+    }),
+  )
+})
+
+function serializeHeaders(headers) {
+  const reqHeaders = {}
+  headers.forEach((value, name) => {
+    reqHeaders[name] = reqHeaders[name]
+      ? [].concat(reqHeaders[name]).concat(value)
+      : value
+  })
+  return reqHeaders
+}
+
+function sendToClient(client, message) {
+  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(JSON.stringify(message), [channel.port2])
+  })
+}
+
+function delayPromise(cb, duration) {
+  return new Promise((resolve) => {
+    setTimeout(() => resolve(cb()), duration)
+  })
+}
+
+function respondWithMock(clientMessage) {
+  return new Response(clientMessage.payload.body, {
+    ...clientMessage.payload,
+    headers: clientMessage.payload.headers,
+  })
+}
+
+function uuidv4() {
+  return 'xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx'.replace(/[xy]/g, function (c) {
+    const r = (Math.random() * 16) | 0
+    const v = c == 'x' ? r : (r & 0x3) | 0x8
+    return v.toString(16)
+  })
+}

src/App.js

@@ -1,16 +1,17 @@
 import './App.css'
 
-import { Route, Router, Switch } from 'react-router-dom'
+import { Redirect, Route, Router, Switch } from 'react-router-dom'
 import { history } from 'utils/history'
 
+import { Example01 } from './examples/01'
+
 export const App = () => (
   <Router history={history}>
     <Switch>
-      <Route path='/page1' component={() => <h1>Page 1</h1>} />
-      <Route path='/page2' component={() => <h1>Page 2</h1>} />
-      <Route path='/page3' component={() => <h1>Page 3</h1>} />
-      <Route path='/page4' component={() => <h1>Page 4</h1>} />
-      <Route path='/page5' component={() => <h1>Page 5</h1>} />
+      <Route exact path='/'>
+        <Redirect to='/example01' />
+      </Route>
+      <Route path='/example01' component={Example01} />
     </Switch>
   </Router>
 )

src/api/index.js

@@ -0,0 +1,10 @@
+import axios from 'axios'
+
+const defaultHeaders = {
+  'Content-Type': 'application/json',
+}
+
+export const instance = axios.create({
+  headers: defaultHeaders,
+  baseURL: '',
+})

src/examples/01.js

@@ -0,0 +1,18 @@
+import { useForm } from 'react-hook-form'
+
+import { instance } from 'api'
+
+export const Example01 = () => {
+  const { register, handleSubmit, errors } = useForm()
+
+  const onSubmit = async () => await instance.post('/example01')
+
+  return (
+    <form onSubmit={handleSubmit(onSubmit)}>
+      <input name='example' defaultValue='test' ref={register} />
+      <input name='exampleRequired' ref={register({ required: true })} />
+      {errors.exampleRequired && <span>This field is required</span>}
+      <input type='submit' />
+    </form>
+  )
+}