Adds support for server side suspense and streaming

examples/streaming-server-side-rendering/.eslintrc.json

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+{
+  "env": {
+    "browser": true
+  },
+  "rules": {
+    "import/no-unresolved": "off",
+    "import/no-extraneous-dependencies": "off"
+  }
+}

examples/streaming-server-side-rendering/.gitignore

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+public/dist

examples/streaming-server-side-rendering/README.md

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+# Get the streaming SSR example running
+
+Steps:
+
+1. Download repository
+
+```bash
+git clone https://github.com/gregberge/loadable-components.git
+```
+
+2. Install [https://yarnpkg.com/lang/en/docs/install](yarn) if haven't already
+3. Install libary dependencies and build library
+
+```bash
+yarn
+yarn build
+```
+
+4. Move into example directory
+
+```bash
+cd ./loadable-components/examples/streaming-server-side-rendering
+```
+
+5. Install project dependencies
+
+```bash
+yarn
+```
+
+5. Run locally or build and serve
+
+```bash
+yarn dev
+
+# Or
+
+yarn build
+yarn start
+```
+
+🍻

examples/streaming-server-side-rendering/babel.config.js

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+function isWebTarget(caller) {
+  return Boolean(caller && caller.target === 'web')
+}
+
+function isWebpack(caller) {
+  return Boolean(caller && caller.name === 'babel-loader')
+}
+
+module.exports = api => {
+  const web = api.caller(isWebTarget)
+  const webpack = api.caller(isWebpack)
+
+  return {
+    presets: [
+      '@babel/preset-react',
+      [
+        '@babel/preset-env',
+        {
+          useBuiltIns: web ? 'entry' : undefined,
+          corejs: web ? 'core-js@3' : false,
+          targets: !web ? { node: 'current' } : undefined,
+          modules: webpack ? false : 'commonjs',
+        },
+      ],
+    ],
+    plugins: ['@babel/plugin-syntax-dynamic-import', '@loadable/babel-plugin', 
+/*     ["transform-define", {
+      "process.env.NODE_ENV": process.env.NODE_ENV,
+    }] */
+  ],
+  }
+}

examples/streaming-server-side-rendering/nodemon.json

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+{
+  "ignore": ["client", "public"],
+  "execMap": {
+    "js": "babel-node"
+  }
+}

examples/streaming-server-side-rendering/package.json

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+{
+  "private": true,
+  "scripts": {
+    "dev": "nodemon src/server/main.js",
+    "build": "rm -Rf ./public && NODE_ENV=production yarn build:webpack && yarn build:lib",
+    "build:webpack": "webpack",
+    "build:lib": "babel -d lib src",
+    "start": "NODE_ENV=production node lib/server/main.js",
+    "link:all": "yarn link @loadable/babel-plugin && yarn link @loadable/server && yarn link @loadable/component"
+  },
+  "devDependencies": {
+    "@babel/cli": "^7.4.4",
+    "@babel/core": "^7.6.2",
+    "@babel/node": "^7.0.0",
+    "@babel/preset-env": "^7.6.2",
+    "@babel/preset-react": "^7.0.0",
+    "@loadable/babel-plugin": "file:./../../packages/babel-plugin",
+    "@loadable/component": "file:./../../packages/component",
+    "@loadable/server": "file:./../../packages/server",
+    "@loadable/webpack-plugin": "file:./../../packages/webpack-plugin",
+    "babel-loader": "^8.0.6",
+    "babel-plugin-transform-define": "^2.1.0",
+    "css-loader": "^2.1.1",
+    "mini-css-extract-plugin": "^0.6.0",
+    "nodemon": "^1.19.0",
+    "webpack": "^4.31.0",
+    "webpack-cli": "^3.3.2",
+    "webpack-dev-middleware": "^3.6.2",
+    "webpack-node-externals": "^1.7.2"
+  },
+  "dependencies": {
+    "core-js": "^3.0.1",
+    "express": "^4.18.2",
+    "moment": "^2.24.0",
+    "react": "^18.2.0",
+    "react-dom": "^18.2.0",
+    "react-error-boundary": "^3.1.4"
+  }
+}

examples/streaming-server-side-rendering/src/client/App.js

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+import React from 'react'
+import { ErrorBoundary } from 'react-error-boundary';
+
+// eslint-disable-next-line import/no-extraneous-dependencies
+import { lazy } from '@loadable/component'
+import Html from './Html'
+
+const A = lazy(() => import('./letters/A'))
+const B = lazy(() => import('./letters/B'))
+const C = lazy(() => import(/* webpackPreload: true */ './letters/C'))
+const D = lazy(() => import(/* webpackPrefetch: true */ './letters/D'))
+const E = lazy(() => import('./letters/E?param'), { ssr: false })
+const X = lazy(props => import(`./letters/${props.letter}`))
+const Sub = lazy(props => import(`./letters/${props.letter}/file`))
+const RootSub = lazy(props => import(`./${props.letter}/file`))
+
+const App = () => {
+  return (
+    <Html title="Hello">
+    <React.Suspense fallback="Loading">
+      <ErrorBoundary FallbackComponent={Error}>  
+          <A />
+          <br />
+          <B />
+          <br />
+          <X letter="A" />
+          <br />
+          <X letter="F" />
+          <br />
+          <E />
+          <br />
+          <Sub letter="Z" />
+          <br />
+          <RootSub letter="Y" />
+        </ErrorBoundary>
+      </React.Suspense>
+    </Html>
+  )
+}
+
+function Error({ error }) {
+  return (
+    <div>
+      <h1>Application Error</h1>
+      <pre style={{ whiteSpace: 'pre-wrap' }}>{error.stack}</pre>
+    </div>
+  );
+}
+
+export default App

examples/streaming-server-side-rendering/src/client/Html.js

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+import React from 'react'
+
+export default function Html({ children, title }) {
+    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" />
+          <title>{title}</title>
+        </head>
+        <body>
+          <noscript
+            dangerouslySetInnerHTML={{
+              __html: `<b>Enable JavaScript to run this app.</b>`
+            }}
+          />
+          {children}
+        </body>
+      </html>
+    );
+  }
+

examples/streaming-server-side-rendering/src/client/Y/file.js

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+export default () => 'Y'

examples/streaming-server-side-rendering/src/client/letters/A.css

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+/* A CSS */
+body {
+    background: pink;
+}

examples/streaming-server-side-rendering/src/client/letters/A.js

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+// We simulate that "moment" is called in "A" and "B"
+
+const A = () => 'A'
+
+
+export default A

examples/streaming-server-side-rendering/src/client/letters/B.js

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+// We simulate that "moment" is called in "A" and "B"
+
+const B = () => 'B'
+
+
+export default B

examples/streaming-server-side-rendering/src/client/letters/C.js

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+export default () => 'C'

examples/streaming-server-side-rendering/src/client/letters/D.js

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+export default () => 'D'

examples/streaming-server-side-rendering/src/client/letters/E.js

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+export default () => 'E'

examples/streaming-server-side-rendering/src/client/letters/F.js

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+export default () => 'F'

examples/streaming-server-side-rendering/src/client/letters/G.js

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+import React from 'react'
+
+const G = ({ prefix }) => <span className="my-cool-class">{prefix} - G</span>
+
+export default G

examples/streaming-server-side-rendering/src/client/letters/Z/file.js

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+export default () => 'Z'

examples/streaming-server-side-rendering/src/client/main-node.js

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+export { default } from './App'
+
+export const hello = 'hello'

examples/streaming-server-side-rendering/src/client/main-web.js

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+import 'core-js'
+import React from 'react'
+import { hydrateRoot } from "react-dom/client";
+// eslint-disable-next-line import/no-extraneous-dependencies
+import App from './App'
+
+hydrateRoot(document, <App />);

examples/streaming-server-side-rendering/src/client/main.css

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+/* Main CSS */
+h1 {
+    color: cyan;
+}

examples/streaming-server-side-rendering/src/server/main.js

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+import path from 'path'
+import express, { json } from 'express'
+import React from 'react'
+import { renderToPipeableStream } from 'react-dom/server';
+import { ChunkExtractor } from '@loadable/server'
+import { Writable } from 'stream';
+import fs from 'fs';
+
+const app = express()
+
+app.use(express.static(path.join(__dirname, '../../public')))
+
+if (process.env.NODE_ENV !== 'production') {
+  /* eslint-disable global-require, import/no-extraneous-dependencies */
+  const { default: webpackConfig } = require('../../webpack.config.babel')
+  const webpackDevMiddleware = require('webpack-dev-middleware')
+  const webpack = require('webpack')
+  /* eslint-enable global-require, import/no-extraneous-dependencies */
+
+  const compiler = webpack(webpackConfig)
+
+  app.use(
+    webpackDevMiddleware(compiler, {
+      logLevel: 'silent',
+      publicPath: '/dist/web',
+      writeToDisk(filePath) {
+        return /dist\/node\//.test(filePath) || /loadable-stats/.test(filePath)
+      },
+    }),
+  )
+}
+
+const nodeStats = path.resolve(
+  __dirname,
+  '../../public/dist/node/loadable-stats.json',
+)
+
+const webStats = path.resolve(
+  __dirname,
+  '../../public/dist/web/loadable-stats.json',
+)
+
+app.get('*', (req, res) => {
+  let didError = false;
+  let shellReady = false;
+  let firstWrite = true;
+
+  let statsNode = JSON.parse(fs.readFileSync(nodeStats))
+  let statsWeb = JSON.parse(fs.readFileSync(webStats))
+
+
+  const nodeExtractor = new ChunkExtractor({ stats: statsNode })
+  const { default: App } = nodeExtractor.requireEntrypoint()
+
+  const webExtractor = new ChunkExtractor({ stats: statsWeb })
+
+  const writeable = new Writable({
+    write(chunk, encoding, callback) {
+      // This should pick up any new link tags that hasn't been previously
+      // written to this stream. Should not write before html if nothing suspended.
+      if (shellReady && !firstWrite) {
+        const scriptTags = webExtractor.getScriptTagsSince()
+        const linkTags = webExtractor.getLinkTagsSince()
+        if (scriptTags) {
+          res.write(scriptTags, encoding)
+        }
+        if (linkTags) {
+          res.write(linkTags, encoding)
+        }
+        // Finally write whatever React tried to write.
+      }
+      firstWrite = false
+      res.write(chunk, encoding, callback)
+    },
+    final(callback) {
+      res.end()
+      callback()
+    },
+    flush() {
+      if (typeof res.flush === 'function') {
+        res.flush();
+      }
+    },
+    destroy(err) {
+      res.destroy(err ?? undefined)
+    }
+  })
+
+  const stream = renderToPipeableStream(webExtractor.collectChunks(<App />),
+    {
+      onShellReady() {
+        // The content above all Suspense boundaries is ready.
+        // If something errored before we started streaming, we set the error code appropriately.
+        res.statusCode = didError ? 500 : 200;
+        res.setHeader('Content-type', 'text/html');
+        stream.pipe(writeable);
+        shellReady = true;
+
+      },
+      onShellError(error) {
+        // Something errored before we could complete the shell so we emit an alternative shell.
+        res.statusCode = 500;
+        res.send(
+          '<!doctype html><p>Loading...</p><script src="clientrender.js"></script>'
+        );
+      },
+      onAllReady() {
+        // If you don't want streaming, use this instead of onShellReady.
+        // This will fire after the entire page content is ready.
+        // You can use this for crawlers or static generation.
+        // If nothing suspends, make sure scripts are written
+        writeable.write('')
+        // res.statusCode = didError ? 500 : 200;
+        // res.setHeader('Content-type', 'text/html');
+        // stream.pipe(res);
+      },
+      onError(err) {
+        didError = true;
+        console.error(err);
+      },
+    }
+  );
+
+
+});
+
+// eslint-disable-next-line no-console
+app.listen(9000, () => console.log('Server started http://localhost:9000'))