flood/client/scripts/start.js

// Do this as the first thing so that any code reading it knows the right env.
process.env.BABEL_ENV = 'development';
process.env.NODE_ENV = 'development';

// Makes the script crash on unhandled rejections instead of silently
// ignoring them. In the future, promise rejections that are not handled will
// terminate the Node.js process with a non-zero exit code.
process.on('unhandledRejection', (err) => {
  throw err;
});

const chalk = require('chalk');
const webpack = require('webpack');
const WebpackDevServer = require('webpack-dev-server');
const clearConsole = require('react-dev-utils/clearConsole');
const checkRequiredFiles = require('react-dev-utils/checkRequiredFiles');
const {choosePort, prepareProxy, prepareUrls} = require('react-dev-utils/WebpackDevServerUtils');
const openBrowser = require('react-dev-utils/openBrowser');
const paths = require('../../shared/config/paths');
const config = require('../config/webpack.config.dev');
const createDevServerConfig = require('../config/webpackDevServer.config');

const userConfig = require('../../config');

const isInteractive = process.stdout.isTTY;

// Warn and crash if required files are missing
if (!checkRequiredFiles([paths.appHtml, paths.appIndex])) {
  process.exit(1);
}

const DEFAULT_PORT = parseInt(process.env.DEV_SERVER_PORT, 10) || 4200;
const HOST = process.env.DEV_SERVER_HOST || '0.0.0.0';

// We attempt to use the default port but if it is busy, we offer the user to
// run on a different port. `detect()` Promise resolves to the next free port.
choosePort(HOST, DEFAULT_PORT)
  .then((port) => {
    if (port == null) {
      // We have not found a port.
      return;
    }

    const protocol = process.env.DEV_SERVER_HTTPS === 'true' ? 'https' : 'http';
    const urls = prepareUrls(protocol, HOST, port);
    // Create a webpack compiler that is configured with custom messages.
    const compiler = webpack(config);
    // Load proxy config
    const proxyConfig = prepareProxy(userConfig.floodServerProxy, paths.appPublic);
    // Serve webpack assets generated by the compiler over a web sever.
    const serverConfig = createDevServerConfig(proxyConfig, urls.lanUrlForConfig);
    const devServer = new WebpackDevServer(compiler, serverConfig);
    // Launch WebpackDevServer.
    devServer.listen(port, HOST, (err) => {
      if (err) {
        return console.log(err);
      }
      if (isInteractive) {
        clearConsole();
      }
      console.log(chalk.cyan('Starting the development server...\n'));
      openBrowser(urls.localUrlForBrowser);
    });

    ['SIGINT', 'SIGTERM'].forEach((sig) => {
      process.on(sig, () => {
        devServer.close();
        process.exit();
      });
    });
  })
  .catch((err) => {
    if (err && err.message) {
      console.log(err.message);
    }
    process.exit(1);
  });