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build.js 4.54 KiB
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// @remove-on-eject-begin
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/**
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 * Copyright (c) 2015-present, Facebook, Inc.
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 * All rights reserved.
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 *
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 * This source code is licensed under the BSD-style license found in the
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 * LICENSE file in the root directory of this source tree. An additional grant
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 * of patent rights can be found in the PATENTS file in the same directory.
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 */
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// @remove-on-eject-end
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'use strict';
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// Do this as the first thing so that any code reading it knows the right env.
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process.env.BABEL_ENV = 'production';
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process.env.NODE_ENV = 'production';
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// Makes the script crash on unhandled rejections instead of silently
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// ignoring them. In the future, promise rejections that are not handled will
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// terminate the Node.js process with a non-zero exit code.
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process.on('unhandledRejection', err => {
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  throw err;
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});
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// Ensure environment variables are read.
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require('../config/env');
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const path = require('path');
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const chalk = require('chalk');
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const fs = require('fs-extra');
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const webpack = require('webpack');
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const config = require('../config/webpack.config.prod');
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const paths = require('../config/paths');
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const checkRequiredFiles = require('react-dev-utils/checkRequiredFiles');
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const formatWebpackMessages = require('react-dev-utils/formatWebpackMessages');
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const printHostingInstructions = require('react-dev-utils/printHostingInstructions');
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const FileSizeReporter = require('react-dev-utils/FileSizeReporter');
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const measureFileSizesBeforeBuild = FileSizeReporter.measureFileSizesBeforeBuild;
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const printFileSizesAfterBuild = FileSizeReporter.printFileSizesAfterBuild;
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const useYarn = fs.existsSync(paths.yarnLockFile);
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// Warn and crash if required files are missing
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if (!checkRequiredFiles([paths.appHtml, paths.appIndexJs])) {
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  process.exit(1);
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}
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// First, read the current file sizes in build directory.
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// This lets us display how much they changed later.
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measureFileSizesBeforeBuild(paths.appBuild)
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  .then(previousFileSizes => {
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    // Remove all content but keep the directory so that
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    // if you're in it, you don't end up in Trash
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    fs.emptyDirSync(paths.appBuild);
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    // Merge with the public folder
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    copyPublicFolder();
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    // Start the webpack build
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    return build(previousFileSizes);
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  })
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  .then(
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    ({ stats, previousFileSizes, warnings }) => {
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      if (warnings.length) {
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        console.log(chalk.yellow('Compiled with warnings.\n'));
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        console.log(warnings.join('\n\n'));
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        console.log(
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          '\nSearch for the ' +
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            chalk.underline(chalk.yellow('keywords')) +
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            ' to learn more about each warning.'
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        );
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        console.log(
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          'To ignore, add ' +
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chalk.cyan('// eslint-disable-next-line') + ' to the line before.\n' ); } else { console.log(chalk.green('Compiled successfully.\n')); } console.log('File sizes after gzip:\n'); printFileSizesAfterBuild(stats, previousFileSizes, paths.appBuild); console.log(); const appPackage = require(paths.appPackageJson); const publicUrl = paths.publicUrl; const publicPath = config.output.publicPath; const buildFolder = path.relative(process.cwd(), paths.appBuild); printHostingInstructions( appPackage, publicUrl, publicPath, buildFolder, useYarn ); }, err => { console.log(chalk.red('Failed to compile.\n')); console.log((err.message || err) + '\n'); process.exit(1); } ); // Create the production build and print the deployment instructions. function build(previousFileSizes) { console.log('Creating an optimized production build...'); let compiler = webpack(config); return new Promise((resolve, reject) => { compiler.run((err, stats) => { if (err) { return reject(err); } const messages = formatWebpackMessages(stats.toJson({}, true)); if (messages.errors.length) { return reject(new Error(messages.errors.join('\n\n'))); } if (process.env.CI && process.env.CI.toLowerCase() !== 'false' && messages.warnings.length) { console.log( chalk.yellow( '\nTreating warnings as errors because process.env.CI = true.\n' + 'Most CI servers set it automatically.\n' ) ); return reject(new Error(messages.warnings.join('\n\n'))); } return resolve({ stats, previousFileSizes, warnings: messages.warnings, }); }); }); } function copyPublicFolder() { fs.copySync(paths.appPublic, paths.appBuild, { dereference: true, filter: file => file !== paths.appHtml, }); }