refactor(pages): refine Contact page

* remove next/router dependency
* remove pageTitle since it is defined in MDX
* reduce statements by grouping messages
* mock response with MSW and add test for sendEmail

1 files changed, 292 insertions, 0 deletions

diff --git a/public/mockServiceWorker.js b/public/mockServiceWorker.js
new file mode 100644
index 0000000..405dc11
--- /dev/null
+++ b/public/mockServiceWorker.js
@@ -0,0 +1,292 @@
+/* eslint-disable */
+/* tslint:disable */
+
+/**
+ * Mock Service Worker (2.0.9).
+ * @see https://github.com/mswjs/msw
+ * - Please do NOT modify this file.
+ * - Please do NOT serve this file on production.
+ */
+
+const INTEGRITY_CHECKSUM = '0877fcdc026242810f5bfde0d7178db4';
+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();
+      // When performing original requests, response body will
+      // always be a ReadableStream, even for 204 responses.
+      // But when creating a new Response instance on the client,
+      // the body for a 204 response must be null.
+      const responseBody = response.status === 204 ? null : responseClone.body;
+
+      sendToClient(
+        client,
+        {
+          type: 'RESPONSE',
+          payload: {
+            requestId,
+            isMockedResponse: IS_MOCKED_RESPONSE in response,
+            type: responseClone.type,
+            status: responseClone.status,
+            statusText: responseClone.statusText,
+            body: responseBody,
+            headers: Object.fromEntries(responseClone.headers.entries()),
+          },
+        },
+        [responseBody]
+      );
+    })();
+  }
+
+  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;
+}