Viewing github.com/facebook/react/fixtures/fizz/server/server.js

```
/**
```

 * Copyright (c) Meta Platforms, Inc. and affiliates.

```
 *
```

 * This source code is licensed under the MIT license found in the

 * LICENSE file in the root directory of this source tree.

```
 *
```
```
 */
```
```
'use strict';
```

const babelRegister = require('@babel/register');

```
babelRegister({
```

  ignore: [/[\\\/](build|server\/server|node_modules)[\\\/]/],

  presets: [['react-app', {runtime: 'automatic'}]],

  plugins: ['@babel/transform-modules-commonjs'],

```
});
```
```
const express = require('express');
```

const compress = require('compression');

```
const {readFileSync} = require('fs');
```
```
const path = require('path');
```

const renderToString = require('./render-to-string');

const renderToStream = require('./render-to-stream');

const renderToBuffer = require('./render-to-buffer');

const {JS_BUNDLE_DELAY} = require('./delays');

```
const PORT = process.env.PORT || 4000;
```
```
const app = express();
```
```
app.use(compress());
```
```
app.get(
```
```
  '/',
```

  handleErrors(async function (req, res) {

```
    await waitForWebpack();
```
```
    renderToStream(req.url, res);
```
```
  })
```
```
);
```
```
app.get(
```
```
  '/string',
```

  handleErrors(async function (req, res) {

```
    await waitForWebpack();
```
```
    renderToString(req.url, res);
```
```
  })
```
```
);
```
```
app.get(
```
```
  '/stream',
```

  handleErrors(async function (req, res) {

```
    await waitForWebpack();
```
```
    renderToStream(req.url, res);
```
```
  })
```
```
);
```
```
app.get(
```
```
  '/buffer',
```

  handleErrors(async function (req, res) {

```
    await waitForWebpack();
```
```
    renderToBuffer(req.url, res);
```
```
  })
```
```
);
```
```
app.use(express.static('build'));
```
```
app.use(express.static('public'));
```
```
app
```
```
  .listen(PORT, () => {
```

    console.log(`Listening at ${PORT}...`);

```
  })
```
```
  .on('error', function (error) {
```
```
    if (error.syscall !== 'listen') {
```
```
      throw error;
```
```
    }
```

    const isPipe = portOrPipe => Number.isNaN(portOrPipe);

    const bind = isPipe(PORT) ? '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;
```
```
    }
```
```
  });
```
```
function handleErrors(fn) {
```

  return async function (req, res, next) {

```
    try {
```
```
      return await fn(req, res);
```
```
    } catch (x) {
```
```
      next(x);
```
```
    }
```
```
  };
```
```
}
```
```
async function waitForWebpack() {
```
```
  while (true) {
```
```
    try {
```

      readFileSync(path.resolve(__dirname, '../build/main.js'));

```
      return;
```
```
    } catch (err) {
```
```
      console.log(
```

        'Could not find webpack build output. Will retry in a second...'

```
      );
```

      await new Promise(resolve => setTimeout(resolve, 1000));

```
    }
```
```
  }
```
```
}
```

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