[Demo] Migrate from fetch-mock to msw

examples/crm/package.json

@@ -12,9 +12,10 @@
         "clsx": "^2.1.1",
         "date-fns": "^3.6.0",
         "faker": "~5.4.0",
+        "fakerest": "4.1.3",
         "lodash": "~4.17.5",
         "papaparse": "^5.4.1",
-        "ra-data-fakerest": "^5.3.0",
+        "ra-data-simple-rest": "^5.3.0",
         "react": "^18.3.1",
         "react-admin": "^5.3.0",
         "react-cropper": "^2.3.3",
@@ -46,5 +47,10 @@
         "build": "tsc && vite build",
         "type-check": "tsc",
         "preview": "vite preview"
+    },
+    "msw": {
+        "workerDirectory": [
+            "public"
+        ]
     }
 }

examples/crm/public/mockServiceWorker.js

@@ -0,0 +1,344 @@
+/* eslint-disable */
+/* tslint:disable */
+
+/**
+ * Mock Service Worker.
+ * @see https://github.com/mswjs/msw
+ * - Please do NOT modify this file.
+ */
+
+const PACKAGE_VERSION = '2.10.4'
+const INTEGRITY_CHECKSUM = 'f5825c521429caf22a4dd13b66e243af'
+const IS_MOCKED_RESPONSE = Symbol('isMockedResponse')
+const activeClientIds = new Set()
+
+addEventListener('install', function () {
+  self.skipWaiting()
+})
+
+addEventListener('activate', function (event) {
+  event.waitUntil(self.clients.claim())
+})
+
+addEventListener('message', async function (event) {
+  const clientId = Reflect.get(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: {
+          packageVersion: PACKAGE_VERSION,
+          checksum: INTEGRITY_CHECKSUM,
+        },
+      })
+      break
+    }
+
+    case 'MOCK_ACTIVATE': {
+      activeClientIds.add(clientId)
+
+      sendToClient(client, {
+        type: 'MOCKING_ENABLED',
+        payload: {
+          client: {
+            id: client.id,
+            frameType: client.frameType,
+          },
+        },
+      })
+      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
+    }
+  }
+})
+
+addEventListener('fetch', function (event) {
+  // Bypass navigation requests.
+  if (event.request.mode === 'navigate') {
+    return
+  }
+
+  // Opening the DevTools triggers the "only-if-cached" request
+  // that cannot be handled by the worker. Bypass such requests.
+  if (
+    event.request.cache === 'only-if-cached' &&
+    event.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 = crypto.randomUUID()
+  event.respondWith(handleRequest(event, requestId))
+})
+
+/**
+ * @param {FetchEvent} event
+ * @param {string} requestId
+ */
+async function handleRequest(event, requestId) {
+  const client = await resolveMainClient(event)
+  const requestCloneForEvents = event.request.clone()
+  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)) {
+    const serializedRequest = await serializeRequest(requestCloneForEvents)
+
+    // Clone the response so both the client and the library could consume it.
+    const responseClone = response.clone()
+
+    sendToClient(
+      client,
+      {
+        type: 'RESPONSE',
+        payload: {
+          isMockedResponse: IS_MOCKED_RESPONSE in response,
+          request: {
+            id: requestId,
+            ...serializedRequest,
+          },
+          response: {
+            type: responseClone.type,
+            status: responseClone.status,
+            statusText: responseClone.statusText,
+            headers: Object.fromEntries(responseClone.headers.entries()),
+            body: responseClone.body,
+          },
+        },
+      },
+      responseClone.body ? [serializedRequest.body, 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.
+ * @param {FetchEvent} event
+ * @returns {Promise<Client | undefined>}
+ */
+async function resolveMainClient(event) {
+  const client = await self.clients.get(event.clientId)
+
+  if (activeClientIds.has(event.clientId)) {
+    return client
+  }
+
+  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)
+    })
+}
+
+/**
+ * @param {FetchEvent} event
+ * @param {Client | undefined} client
+ * @param {string} requestId
+ * @returns {Promise<Response>}
+ */
+async function getResponse(event, client, requestId) {
+  // Clone the request because it might've been already used
+  // (i.e. its body has been read and sent to the client).
+  const requestClone = event.request.clone()
+
+  function passthrough() {
+    // Cast the request headers to a new Headers instance
+    // so the headers can be manipulated with.
+    const headers = new Headers(requestClone.headers)
+
+    // Remove the "accept" header value that marked this request as passthrough.
+    // This prevents request alteration and also keeps it compliant with the
+    // user-defined CORS policies.
+    const acceptHeader = headers.get('accept')
+    if (acceptHeader) {
+      const values = acceptHeader.split(',').map((value) => value.trim())
+      const filteredValues = values.filter(
+        (value) => value !== 'msw/passthrough',
+      )
+
+      if (filteredValues.length > 0) {
+        headers.set('accept', filteredValues.join(', '))
+      } else {
+        headers.delete('accept')
+      }
+    }
+
+    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()
+  }
+
+  // Notify the client that a request has been intercepted.
+  const serializedRequest = await serializeRequest(event.request)
+  const clientMessage = await sendToClient(
+    client,
+    {
+      type: 'REQUEST',
+      payload: {
+        id: requestId,
+        ...serializedRequest,
+      },
+    },
+    [serializedRequest.body],
+  )
+
+  switch (clientMessage.type) {
+    case 'MOCK_RESPONSE': {
+      return respondWithMock(clientMessage.data)
+    }
+
+    case 'PASSTHROUGH': {
+      return passthrough()
+    }
+  }
+
+  return passthrough()
+}
+
+/**
+ * @param {Client} client
+ * @param {any} message
+ * @param {Array<Transferable>} transferrables
+ * @returns {Promise<any>}
+ */
+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,
+      ...transferrables.filter(Boolean),
+    ])
+  })
+}
+
+/**
+ * @param {Response} response
+ * @returns {Response}
+ */
+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
+}
+
+/**
+ * @param {Request} request
+ */
+async function serializeRequest(request) {
+  return {
+    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: await request.arrayBuffer(),
+    keepalive: request.keepalive,
+  }
+}

examples/crm/src/index.tsx

@@ -2,15 +2,18 @@ import React from 'react';
 import { createRoot } from 'react-dom/client';
 import App from './App';
 import reportWebVitals from './reportWebVitals';
+import { worker } from './providers/fakerest/fakeServer';
 
 const container = document.getElementById('root');
 const root = createRoot(container!);
 
-root.render(
-    <React.StrictMode>
-        <App />
-    </React.StrictMode>
-);
+worker.start({ onUnhandledRequest: 'bypass' }).then(() => {
+    root.render(
+        <React.StrictMode>
+            <App />
+        </React.StrictMode>
+    );
+});
 
 // If you want to start measuring performance in your app, pass a function
 // to log results (for example: reportWebVitals(console.log))