bufferapp/ui

// 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 { checkBrowsers } = require('react-dev-utils/browsersHelper')
const bfj = require('bfj')
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 config = require('./config/webpack.config.prod')
const paths = require('./config/paths')
 
const { measureFileSizesBeforeBuild } = FileSizeReporter
const { printFileSizesAfterBuild } = FileSizeReporter
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
 
function copyPublicFolder() {
  fs.copySync(paths.appPublic, paths.appBuild, {
    dereference: true,
    filter: (file) => file !== paths.appHtml,
  })
}
 
// Create the production build and print the deployment instructions.
Function `build` has 52 lines of code (exceeds 25 allowed). Consider refactoring.
function build(previousFileSizes) {
  console.info('Creating an optimized production build...')
 
  const 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.info(
          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)))
      }
 
Avoid too many `return` statements within this function.
      return resolve(resolveArgs)
    })
  })
}
 
// We require that you explicitly set browsers and do not fall back to
// browserslist defaults.
 
Identical blocks of code found in 2 locations. Consider refactoring.
checkBrowsers(paths.appPath, isInteractive)
  // First, read the current file sizes in build directory.
  // This lets us display how much they changed later.
  .then(() => 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.info(chalk.yellow('Compiled with warnings.\n'))
        console.info(warnings.join('\n\n'))
        console.info(
          `\nSearch for the ${chalk.underline(
            chalk.yellow('keywords'),
          )} to learn more about each warning.`,
        )
        console.info(
          `To ignore, add ${chalk.cyan(
            '// eslint-disable-next-line',
          )} to the line before.\n`,
        )
      } else {
        console.info(chalk.green('Compiled successfully.\n'))
      }
 
      console.info('File sizes after gzip:\n')
      printFileSizesAfterBuild(
        stats,
        previousFileSizes,
        paths.appBuild,
        WARN_AFTER_BUNDLE_GZIP_SIZE,
        WARN_AFTER_CHUNK_GZIP_SIZE,
      )
      console.info()
 
      const appPackage = require(paths.appPackageJson)
      const { publicUrl } = paths
      const { publicPath } = config.output
      const buildFolder = path.relative(process.cwd(), paths.appBuild)
      printHostingInstructions(
        appPackage,
        publicUrl,
        publicPath,
        buildFolder,
        useYarn,
      )
    },
    (err) => {
      console.info(chalk.red('Failed to compile.\n'))
      printBuildError(err)
      process.exit(1)
    },
  )
  .catch((err) => {
    if (err && err.message) {
      console.info(err.message)
    }
    process.exit(1)
  })