github.com/shyftnetwork/go-empyrean@v1.8.3-0.20191127201940-fbfca9338f04/shyftBlockExplorerUI/scripts/start.js (about)

     1  'use strict';
     2  
     3  // Do this as the first thing so that any code reading it knows the right env.
     4  process.env.BABEL_ENV = 'development';
     5  process.env.NODE_ENV = 'development';
     6  
     7  // Makes the script crash on unhandled rejections instead of silently
     8  // ignoring them. In the future, promise rejections that are not handled will
     9  // terminate the Node.js process with a non-zero exit code.
    10  process.on('unhandledRejection', err => {
    11    throw err;
    12  });
    13  
    14  // Ensure environment variables are read.
    15  require('../config/env');
    16  
    17  const fs = require('fs');
    18  const chalk = require('chalk');
    19  const webpack = require('webpack');
    20  const WebpackDevServer = require('webpack-dev-server');
    21  const clearConsole = require('react-dev-utils/clearConsole');
    22  const checkRequiredFiles = require('react-dev-utils/checkRequiredFiles');
    23  const {
    24    choosePort,
    25    createCompiler,
    26    prepareProxy,
    27    prepareUrls,
    28  } = require('react-dev-utils/WebpackDevServerUtils');
    29  const openBrowser = require('react-dev-utils/openBrowser');
    30  const paths = require('../config/paths');
    31  const config = require('../config/webpack.config.dev');
    32  const createDevServerConfig = require('../config/webpackDevServer.config');
    33  
    34  const useYarn = fs.existsSync(paths.yarnLockFile);
    35  const isInteractive = process.stdout.isTTY;
    36  
    37  // Warn and crash if required files are missing
    38  if (!checkRequiredFiles([paths.appHtml, paths.appIndexJs])) {
    39    process.exit(1);
    40  }
    41  
    42  // Tools like Cloud9 rely on this.
    43  const DEFAULT_PORT = parseInt(process.env.PORT, 10) || 3000;
    44  const HOST = process.env.HOST || '0.0.0.0';
    45  
    46  if (process.env.HOST) {
    47    console.log(
    48      chalk.cyan(
    49        `Attempting to bind to HOST environment variable: ${chalk.yellow(
    50          chalk.bold(process.env.HOST)
    51        )}`
    52      )
    53    );
    54    console.log(
    55      `If this was unintentional, check that you haven't mistakenly set it in your shell.`
    56    );
    57    console.log(`Learn more here: ${chalk.yellow('http://bit.ly/2mwWSwH')}`);
    58    console.log();
    59  }
    60  
    61  // We attempt to use the default port but if it is busy, we offer the user to
    62  // run on a different port. `choosePort()` Promise resolves to the next free port.
    63  choosePort(HOST, DEFAULT_PORT)
    64    .then(port => {
    65      if (port == null) {
    66        // We have not found a port.
    67        return;
    68      }
    69      const protocol = process.env.HTTPS === 'true' ? 'https' : 'http';
    70      const appName = require(paths.appPackageJson).name;
    71      const urls = prepareUrls(protocol, HOST, port);
    72      // Create a webpack compiler that is configured with custom messages.
    73      const compiler = createCompiler(webpack, config, appName, urls, useYarn);
    74      // Load proxy config
    75      const proxySetting = require(paths.appPackageJson).proxy;
    76      const proxyConfig = prepareProxy(proxySetting, paths.appPublic);
    77      // Serve webpack assets generated by the compiler over a web sever.
    78      const serverConfig = createDevServerConfig(
    79        proxyConfig,
    80        urls.lanUrlForConfig
    81      );
    82      const devServer = new WebpackDevServer(compiler, serverConfig);
    83      // Launch WebpackDevServer.
    84      devServer.listen(port, HOST, err => {
    85        if (err) {
    86          return console.log(err);
    87        }
    88        if (isInteractive) {
    89          clearConsole();
    90        }
    91        console.log(chalk.cyan('Starting the development server...\n'));
    92        openBrowser(urls.localUrlForBrowser);
    93      });
    94  
    95      ['SIGINT', 'SIGTERM'].forEach(function(sig) {
    96        process.on(sig, function() {
    97          devServer.close();
    98          process.exit();
    99        });
   100      });
   101    })
   102    .catch(err => {
   103      if (err && err.message) {
   104        console.log(err.message);
   105      }
   106      process.exit(1);
   107    });