text: // @remove-on-eject-begin
  /**
   * Copyright (c) 2015-present, Facebook, Inc.
   *
   * This source code is licensed under the MIT license found in the
   * LICENSE file in the root directory of this source tree.
   */
  // @remove-on-eject-end
  'use strict';
  
  // Do this as the first thing so that any code reading it knows the right env.
  process.env.BABEL_ENV = 'production';
  process.env.NODE_ENV = 'production';
  
  // 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;
  });
  
  // Ensure environment variables are read.
  require('../config/env');
  // @remove-on-eject-begin
  // Do the preflight checks (only happens before eject).
  const verifyPackageTree = require('./utils/verifyPackageTree');
  if (process.env.SKIP_PREFLIGHT_CHECK !== 'true') {
    verifyPackageTree();
  }
  const verifyTypeScriptSetup = require('./utils/verifyTypeScriptSetup');
  verifyTypeScriptSetup();
  // @remove-on-eject-end
  
  const chalk = require('chalk');
  const path = require('path');
  const fs = require('fs-extra');
  const webpack = require('webpack');
  const configFactory = require('../config/webpack.config');
  const paths = require('../config/paths');
  const getEntries = require('./utils/getEntries');
  const getSpaPaths = require('./utils/getSpaPaths');
  const checkRequiredFiles = require('react-dev-utils/checkRequiredFiles');
  const formatWebpackMessages = require('react-dev-utils/formatWebpackMessages');
  const printHostingInstructions = require('react-dev-utils/printHostingInstructions');
  const FileSizeReporter = require('react-dev-utils/FileSizeReporter');
  const printBuildError = require('react-dev-utils/printBuildError');
  
  const appPackageJson = require(paths.appPackageJson);
  const measureFileSizesBeforeBuild =
    FileSizeReporter.measureFileSizesBeforeBuild;
  const printFileSizesAfterBuild = FileSizeReporter.printFileSizesAfterBuild;
  
  // These sizes are pretty large. We'll warn for bundles exceeding them.
  const WARN_AFTER_BUNDLE_GZIP_SIZE = 512 * 1024;
  const WARN_AFTER_CHUNK_GZIP_SIZE = 1024 * 1024;
  
  const isInteractive = process.stdout.isTTY;
  
  // Warn and crash if required files are missing
  if (!checkRequiredFiles([paths.appIndexJs])) {
    process.exit(1);
  }
  
  // Process CLI arguments
  const argv = process.argv.slice(2);
  const writeStatsJson = argv.indexOf('--stats') !== -1;
  
  const spaPaths = getSpaPaths();
  
  const spaEntries = Object.entries(spaPaths).reduce((acc, [key, value]) => {
    acc[key] = value.entryPath;
    return acc;
  }, {});
  
  const spaHtmlPaths = Object.entries(spaPaths).reduce((acc, [key, value]) => {
    acc[key] = value.htmlTemplatePath;
    return acc;
  }, {});
  
  const appConfig = configFactory('production', {
    entries: {
      app: paths.appIndexJs,
      ...(fs.existsSync(paths.staticJs) && { static: paths.staticJs }),
      ...getEntries('lib', paths.libDir, '/*.{js,jsx,ts,tsx,scss,css}'),
      ...spaEntries,
    },
    spaHtmlPaths,
  });
  
  const componentsConfig = configFactory('lib', {
    entries: {
      ...getEntries(
        'components',
        paths.componentsDir,
        '/*.{js,jsx,ts,tsx,scss,css}'
      ),
      ...getEntries(
        'components',
        paths.componentsDir,
        '/**/index.{js,jsx,ts,tsx}'
      ),
      ...getEntries(
        'components',
        paths.componentsDir,
        '/**/*.static.{js,jsx,ts,tsx}'
      ),
    },
  });
  
  const run = async () => {
    await runBuild(appConfig, 'app');
    if (process.env.BUILD_COMPONENTS !== 'false') {
      await runBuild(componentsConfig, 'components');
    }
  };
  
  run();
  
  async function runBuild(config, buildType) {
    // We require that you explicitly set browsers and do not fall back to
    // browserslist defaults.
    const { checkBrowsers } = require('react-dev-utils/browsersHelper');
    return checkBrowsers(paths.appPath, isInteractive)
      .then(() => {
        // First, read the current file sizes in build directory.
        // This lets us display how much they changed later.
        return measureFileSizesBeforeBuild(paths.appBuild);
      })
      .then(previousFileSizes => {
        if (buildType === 'app') {
          // Remove all content but keep the directory so that
          // if you're in it, you don't end up in Trash
          fs.emptyDirSync(paths.appBuild);
          // Merge with the public folder
          copyPublicFolder();
        }
        // Start the webpack build
        return build(previousFileSizes, config, buildType);
      })
      .then(
        ({ stats, previousFileSizes, warnings }) => {
          if (warnings.length) {
            console.log(chalk.yellow(`Compiled ${buildType} with warnings.\n`));
            console.log(warnings.join('\n\n'));
            console.log(
              '\nSearch for the ' +
                chalk.underline(chalk.yellow('keywords')) +
                ' to learn more about each warning.'
            );
            console.log(
              'To ignore, add ' +
                chalk.cyan('// eslint-disable-next-line') +
                ' to the line before.\n'
            );
          } else {
            console.log(chalk.green(`Compiled ${buildType} successfully.\n`));
          }
  
          console.log('File sizes after gzip:\n');
          printFileSizesAfterBuild(
            stats,
            previousFileSizes,
            paths.appBuild,
            WARN_AFTER_BUNDLE_GZIP_SIZE,
            WARN_AFTER_CHUNK_GZIP_SIZE
          );
          console.log();
        },
        err => {
          const tscCompileOnError = process.env.TSC_COMPILE_ON_ERROR === 'true';
          if (tscCompileOnError) {
            console.log(
              chalk.yellow(
                'Compiled with the following buildType errors (you may want to check these before deploying your app):\n'
              )
            );
            printBuildError(err);
          } else {
            console.log(chalk.red('Failed to compile.\n'));
            printBuildError(err);
            process.exit(1);
          }
        }
      )
      .catch(err => {
        if (err && err.message) {
          console.log(err.message);
        }
        process.exit(1);
      });
  }
  
  // Create the production build and print the deployment instructions.
  function build(previousFileSizes, config, buildType) {
    // We used to support resolving modules according to `NODE_PATH`.
    // This now has been deprecated in favor of jsconfig/tsconfig.json
    // This lets you use absolute paths in imports inside large monorepos:
    if (process.env.NODE_PATH) {
      console.log(
        chalk.yellow(
          'Setting NODE_PATH to resolve modules absolutely has been deprecated in favor of setting baseUrl in jsconfig.json (or tsconfig.json if you are using TypeScript) and will be removed in a future major release of create-react-app.'
        )
      );
      console.log();
    }
  
    console.log(`Creating an optimized production build of ${buildType}...`);
  
    const compiler = webpack(config);
    return new Promise((resolve, reject) => {
      compiler.run((err, stats) => {
        let messages;
        if (err) {
          if (!err.message) {
            return reject(err);
          }
  
          let errMessage = err.message;
  
          // Add additional information for postcss errors
          if (Object.prototype.hasOwnProperty.call(err, 'postcssNode')) {
            errMessage +=
              '\nCompileError: Begins at CSS selector ' +
              err['postcssNode'].selector;
          }
  
          messages = formatWebpackMessages({
            errors: [errMessage],
            warnings: [],
          });
        } else {
          messages = formatWebpackMessages(
            stats.toJson({ all: false, warnings: true, errors: true })
          );
        }
        if (messages.errors.length) {
          // Only keep the first error. Others are often indicative
          // of the same problem, but confuse the reader with noise.
          if (messages.errors.length > 1) {
            messages.errors.length = 1;
          }
          return reject(new Error(messages.errors.join('\n\n')));
        }
        if (
          process.env.CI &&
          (typeof process.env.CI !== 'string' ||
            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,
    });
  }
  