facebook · sebmarkbage · Jan 8, 2025 · Dec 24, 2024 · Dec 26, 2024 · Dec 26, 2024
diff --git a/fixtures/view-transition/README.md b/fixtures/view-transition/README.md
@@ -0,0 +1,30 @@
+# View Transition
+
+A test case for View Transitions.
+
+## Setup
+
+To reference a local build of React, first run `npm run build` at the root
+of the React project. Then:
+
+```
+cd fixtures/view-transition
+yarn
+yarn start
+```
+
+The `start` command runs a webpack dev server and a server-side rendering server in development mode with hot reloading.
+
+**Note: whenever you make changes to React and rebuild it, you need to re-run `yarn` in this folder:**
+
+```
+yarn
+```
+
+If you want to try the production mode instead run:
+
+```
+yarn start:prod
+```
+
+This will pre-build all static resources and then start a server-side rendering HTTP server that hosts the React app and service the static resources (without hot reloading).
diff --git a/fixtures/view-transition/package.json b/fixtures/view-transition/package.json
@@ -0,0 +1,28 @@
+{
+  "name": "react-fixtures-view-transition",
+  "version": "0.1.0",
+  "private": true,
+  "devDependencies": {
+    "concurrently": "3.1.0",
+    "http-proxy-middleware": "0.17.3",
+    "react-scripts": "0.9.5"
+  },
+  "dependencies": {
+    "express": "^4.14.0",
+    "ignore-styles": "^5.0.1",
+    "react": "^19.0.0",
+    "react-dom": "^19.0.0"
+  },
+  "scripts": {
+    "predev": "cp -r ../../build/oss-experimental/* ./node_modules/",
+    "prestart": "cp -r ../../build/oss-experimental/* ./node_modules/",
+    "prebuild": "cp -r ../../build/oss-experimental/* ./node_modules/",
+    "dev": "concurrently \"npm run dev:server\" \"npm run dev:client\"",
+    "dev:client": "PORT=3001 react-scripts start",
+    "dev:server": "NODE_ENV=development node server",
+    "start": "react-scripts build && NODE_ENV=production node server",
+    "build": "react-scripts build",
+    "test": "react-scripts test --env=jsdom",
+    "eject": "react-scripts eject"
+  }
+}
diff --git a/fixtures/view-transition/public/favicon.ico b/fixtures/view-transition/public/favicon.ico
diff --git a/fixtures/view-transition/public/index.html b/fixtures/view-transition/public/index.html
@@ -0,0 +1,13 @@
+<!doctype html>
+<html>
+  <body>
+    <script>
+      /*
+      This is just a placeholder to make react-scripts happy.
+      We're not using it. If we end up here, redirect to the
+      primary server.
+      */
+      location.href = '//localhost:3000/';
+    </script>
+  </body>
+</html>
diff --git a/fixtures/view-transition/server/index.js b/fixtures/view-transition/server/index.js
@@ -0,0 +1,70 @@
+require('ignore-styles');
+const babelRegister = require('babel-register');
+const proxy = require('http-proxy-middleware');
+
+babelRegister({
+  ignore: /\/(build|node_modules)\//,
+  presets: ['react-app'],
+});
+
+const express = require('express');
+const path = require('path');
+
+const app = express();
+
+// Application
+if (process.env.NODE_ENV === 'development') {
+  app.get('/', function (req, res) {
+    // In development mode we clear the module cache between each request to
+    // get automatic hot reloading.
+    for (var key in require.cache) {
+      delete require.cache[key];
+    }
+    const render = require('./render').default;
+    render(req.url, res);
+  });
+} else {
+  const render = require('./render').default;
+  app.get('/', function (req, res) {
+    render(req.url, res);
+  });
+}
+
+// Static resources
+app.use(express.static(path.resolve(__dirname, '..', 'build')));
+
+// Proxy everything else to create-react-app's webpack development server
+if (process.env.NODE_ENV === 'development') {
+  app.use(
+    '/',
+    proxy({
+      ws: true,
+      target: 'http://localhost:3001',
+    })
+  );
+}
+
+app.listen(3000, () => {
+  console.log('Listening on port 3000...');
+});
+
+app.on('error', function (error) {
+  if (error.syscall !== 'listen') {
+    throw error;
+  }
+
+  var bind = typeof port === 'string' ? 'Pipe ' + port : 'Port ' + port;
+
+  switch (error.code) {
+    case 'EACCES':
+      console.error(bind + ' requires elevated privileges');
+      process.exit(1);
+      break;
+    case 'EADDRINUSE':
+      console.error(bind + ' is already in use');
+      process.exit(1);
+      break;
+    default:
+      throw error;
+  }
+});
diff --git a/fixtures/view-transition/server/render.js b/fixtures/view-transition/server/render.js
@@ -0,0 +1,44 @@
+import React from 'react';
+import {renderToPipeableStream} from 'react-dom/server';
+
+import App from '../src/components/App';
+
+let assets;
+if (process.env.NODE_ENV === 'development') {
+  // Use the bundle from create-react-app's server in development mode.
+  assets = {
+    'main.js': '/static/js/bundle.js',
+    // 'main.css': '',
+  };
+} else {
+  assets = require('../build/asset-manifest.json');
+}
+
+export default function render(url, res) {
+  res.socket.on('error', error => {
+    // Log fatal errors
+    console.error('Fatal', error);
+  });
+  let didError = false;
+  const {pipe, abort} = renderToPipeableStream(<App assets={assets} />, {
+    bootstrapScripts: [assets['main.js']],
+    onShellReady() {
+      // If something errored before we started streaming, we set the error code appropriately.
+      res.statusCode = didError ? 500 : 200;
+      res.setHeader('Content-type', 'text/html');
+      pipe(res);
+    },
+    onShellError(x) {
+      // Something errored before we could complete the shell so we emit an alternative shell.
+      res.statusCode = 500;
+      res.send('<!doctype><p>Error</p>');
+    },
+    onError(x) {
+      didError = true;
+      console.error(x);
+    },
+  });
+  // Abandon and switch to client rendering after 5 seconds.
+  // Try lowering this to see the client recover.
+  setTimeout(abort, 5000);
+}
diff --git a/fixtures/view-transition/src/components/App.js b/fixtures/view-transition/src/components/App.js
@@ -0,0 +1,12 @@
+import React from 'react';
+
+import Chrome from './Chrome';
+import Page from './Page';
+
+export default function App({assets}) {
+  return (
+    <Chrome title="Hello World" assets={assets}>
+      <Page />
+    </Chrome>
+  );
+}
diff --git a/fixtures/view-transition/src/components/Chrome.css b/fixtures/view-transition/src/components/Chrome.css
@@ -0,0 +1,5 @@
+body {
+  margin: 10px;
+  padding: 0;
+  font-family: sans-serif;
+}
diff --git a/fixtures/view-transition/src/components/Chrome.js b/fixtures/view-transition/src/components/Chrome.js
@@ -0,0 +1,33 @@
+import React, {Component} from 'react';
+
+import './Chrome.css';
+
+export default class Chrome extends Component {
+  render() {
+    const assets = this.props.assets;
+    return (
+      <html lang="en">
+        <head>
+          <meta charSet="utf-8" />
+          <meta name="viewport" content="width=device-width, initial-scale=1" />
+          <link rel="shortcut icon" href="favicon.ico" />
+          <link rel="stylesheet" href={assets['main.css']} />
+          <title>{this.props.title}</title>
+        </head>
+        <body>
+          <noscript
+            dangerouslySetInnerHTML={{
+              __html: `<b>Enable JavaScript to run this app.</b>`,
+            }}
+          />
+          {this.props.children}
+          <script
+            dangerouslySetInnerHTML={{
+              __html: `assetManifest = ${JSON.stringify(assets)};`,
+            }}
+          />
+        </body>
+      </html>
+    );
+  }
+}
diff --git a/fixtures/view-transition/src/components/Page.css b/fixtures/view-transition/src/components/Page.css
diff --git a/fixtures/view-transition/src/components/Page.js b/fixtures/view-transition/src/components/Page.js
@@ -0,0 +1,79 @@
+import React, {
+  unstable_ViewTransition as ViewTransition,
+  startTransition,
+  useEffect,
+  useState,
+  unstable_Activity as Activity,
+} from 'react';
+
+import './Page.css';
+
+const a = (
+  <div key="a">
+    <ViewTransition>
+      <div>a</div>
+    </ViewTransition>
+  </div>
+);
+
+const b = (
+  <div key="b">
+    <ViewTransition>
+      <div>b</div>
+    </ViewTransition>
+  </div>
+);
+
+export default function Page() {
+  const [show, setShow] = useState(false);
+  useEffect(() => {
+    startTransition(() => {
+      setShow(true);
+    });
+  }, []);
+  const exclamation = (
+    <ViewTransition name="exclamation">
+      <span>!</span>
+    </ViewTransition>
+  );
+  return (
+    <div>
+      <button
+        onClick={() => {
+          startTransition(() => {
+            setShow(show => !show);
+          });
+        }}>
+        {show ? 'A' : 'B'}
+      </button>
+      <ViewTransition>
+        <div>
+          {show ? (
+            <div>
+              {a}
+              {b}
+            </div>
+          ) : (
+            <div>
+              {b}
+              {a}
+            </div>
+          )}
+          <ViewTransition>
+            {show ? <div>hello{exclamation}</div> : <section>Loading</section>}
+          </ViewTransition>
+          {show ? null : (
+            <ViewTransition>
+              <div>world{exclamation}</div>
+            </ViewTransition>
+          )}
+          <Activity mode={show ? 'visible' : 'hidden'}>
+            <ViewTransition>
+              <div>!!</div>
+            </ViewTransition>
+          </Activity>
+        </div>
+      </ViewTransition>
+    </div>
+  );
+}
diff --git a/fixtures/view-transition/src/index.js b/fixtures/view-transition/src/index.js
@@ -0,0 +1,6 @@
+import React from 'react';
+import {hydrateRoot} from 'react-dom/client';
+
+import App from './components/App';
+
+hydrateRoot(document, <App assets={window.assetManifest} />);