diff options
author | Determinant <ted.sybil@gmail.com> | 2019-02-06 23:36:34 -0500 |
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committer | Determinant <ted.sybil@gmail.com> | 2019-02-06 23:36:34 -0500 |
commit | 13a2bd4f4aee6b4dec0ce799e9ba212693cbedf1 (patch) | |
tree | de455efa781bdb07101eaa3283971b057e8081a7 /scripts/build.js | |
parent | 96b08d7651a7ecddc15bc77ce5c453fbe4e12b12 (diff) |
eject from create-react-app
Diffstat (limited to 'scripts/build.js')
-rw-r--r-- | scripts/build.js | 192 |
1 files changed, 192 insertions, 0 deletions
diff --git a/scripts/build.js b/scripts/build.js new file mode 100644 index 0000000..69142da --- /dev/null +++ b/scripts/build.js @@ -0,0 +1,192 @@ +'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'); + + +const path = require('path'); +const chalk = require('chalk'); +const fs = require('fs-extra'); +const webpack = require('webpack'); +const bfj = require('bfj'); +const configFactory = require('../config/webpack.config'); +const paths = require('../config/paths'); +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 measureFileSizesBeforeBuild = + FileSizeReporter.measureFileSizesBeforeBuild; +const printFileSizesAfterBuild = FileSizeReporter.printFileSizesAfterBuild; +const useYarn = fs.existsSync(paths.yarnLockFile); + +// 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.appHtml, paths.appIndexJs])) { + process.exit(1); +} + +// Process CLI arguments +const argv = process.argv.slice(2); +const writeStatsJson = argv.indexOf('--stats') !== -1; + +// Generate configuration +const config = configFactory('production'); + +// We require that you explicitly set browsers and do not fall back to +// browserslist defaults. +const { checkBrowsers } = require('react-dev-utils/browsersHelper'); +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 => { + // 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); + }) + .then( + ({ stats, previousFileSizes, warnings }) => { + if (warnings.length) { + console.log(chalk.yellow('Compiled 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 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(); + + 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')); + 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) { + console.log('Creating an optimized production build...'); + + let compiler = webpack(config); + return new Promise((resolve, reject) => { + compiler.run((err, stats) => { + let messages; + if (err) { + if (!err.message) { + return reject(err); + } + messages = formatWebpackMessages({ + errors: [err.message], + 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'))); + } + + const resolveArgs = { + stats, + previousFileSizes, + warnings: messages.warnings, + }; + if (writeStatsJson) { + return bfj + .write(paths.appBuild + '/bundle-stats.json', stats.toJson()) + .then(() => resolve(resolveArgs)) + .catch(error => reject(new Error(error))); + } + + return resolve(resolveArgs); + }); + }); +} + +function copyPublicFolder() { + fs.copySync(paths.appPublic, paths.appBuild, { + dereference: true, + filter: file => file !== paths.appHtml, + }); +} |