webpackDevServer.config.js

// @remove-on-eject-begin
/**
 * Copyright (c) 2015-present, Facebook, Inc.
 * All rights reserved.
 *
 * This source code is licensed under the BSD-style license found in the
 * LICENSE file in the root directory of this source tree. An additional grant
 * of patent rights can be found in the PATENTS file in the same directory.
 */
// @remove-on-eject-end
'use strict';

const config = require('./webpack.config.dev');
const paths = require('./paths');

const protocol = process.env.HTTPS === 'true' ? 'https' : 'http';
const host = process.env.HOST || 'localhost';

module.exports = {
  // Enable gzip compression of generated files.
  compress: true,
  // Silence WebpackDevServer's own logs since they're generally not useful.
  // It will still show compile warnings and errors with this setting.
  clientLogLevel: 'none',
  // By default WebpackDevServer serves physical files from current directory
  // in addition to all the virtual build products that it serves from memory.
  // This is confusing because those files won’t automatically be available in
  // production build folder unless we copy them. However, copying the whole
  // project directory is dangerous because we may expose sensitive files.
  // Instead, we establish a convention that only files in `public` directory
  // get served. Our build script will copy `public` into the `build` folder.
  // In `index.html`, you can get URL of `public` folder with %PUBLIC_URL%:
  // <link rel="shortcut icon" href="%PUBLIC_URL%/favicon.ico">
  // In JavaScript code, you can access it with `process.env.PUBLIC_URL`.
  // Note that we only recommend to use `public` folder as an escape hatch
  // for files like `favicon.ico`, `manifest.json`, and libraries that are
  // for some reason broken when imported through Webpack. If you just want to
  // use an image, put it in `src` and `import` it from JavaScript instead.
  contentBase: paths.appPublic,
  // By default files from `contentBase` will not trigger a page reload.
  watchContentBase: true,
  // Enable hot reloading server. It will provide /sockjs-node/ endpoint
  // for the WebpackDevServer client so it can learn when the files were
  // updated. The WebpackDevServer client is included as an entry point
  // in the Webpack development configuration. Note that only changes
  // to CSS are currently hot reloaded. JS changes will refresh the browser.
  hot: true,
  // It is important to tell WebpackDevServer to use the same "root" path
  // as we specified in the config. In development, we always serve from /.
  publicPath: config.output.publicPath,
  // WebpackDevServer is noisy by default so we emit custom message instead
  // by listening to the compiler events with `compiler.plugin` calls above.
  quiet: true,
  // Reportedly, this avoids CPU overload on some systems.
  // https://github.com/facebookincubator/create-react-app/issues/293
  watchOptions: {
    ignored: /node_modules/,
  },
  // Enable HTTPS if the HTTPS environment variable is set to 'true'
  https: protocol === 'https',
  host: host,
  overlay: false,
};