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node_modules/@vue/cli-service/lib/commands/build/index.js

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+const defaults = {
+  clean: true,
+  target: 'app',
+  module: true,
+  formats: 'commonjs,umd,umd-min'
+}
+
+const buildModes = {
+  lib: 'library',
+  wc: 'web component',
+  'wc-async': 'web component (async)'
+}
+
+const modifyConfig = (config, fn) => {
+  if (Array.isArray(config)) {
+    config.forEach(c => fn(c))
+  } else {
+    fn(config)
+  }
+}
+
+module.exports = (api, options) => {
+  api.registerCommand('build', {
+    description: 'build for production',
+    usage: 'vue-cli-service build [options] [entry|pattern]',
+    options: {
+      '--mode': `specify env mode (default: production)`,
+      '--dest': `specify output directory (default: ${options.outputDir})`,
+      '--no-module': `build app without generating <script type="module"> chunks for modern browsers`,
+      '--target': `app | lib | wc | wc-async (default: ${defaults.target})`,
+      '--inline-vue': 'include the Vue module in the final bundle of library or web component target',
+      '--formats': `list of output formats for library builds (default: ${defaults.formats})`,
+      '--name': `name for lib or web-component mode (default: "name" in package.json or entry filename)`,
+      '--filename': `file name for output, only usable for 'lib' target (default: value of --name)`,
+      '--no-clean': `do not remove the dist directory contents before building the project`,
+      '--report': `generate report.html to help analyze bundle content`,
+      '--report-json': 'generate report.json to help analyze bundle content',
+      '--skip-plugins': `comma-separated list of plugin names to skip for this run`,
+      '--watch': `watch for changes`,
+      '--stdin': `close when stdin ends`
+    }
+  }, async (args, rawArgs) => {
+    for (const key in defaults) {
+      if (args[key] == null) {
+        args[key] = defaults[key]
+      }
+    }
+    args.entry = args.entry || args._[0]
+    if (args.target !== 'app') {
+      args.entry = args.entry || 'src/App.vue'
+    }
+
+    process.env.VUE_CLI_BUILD_TARGET = args.target
+
+    const { log, execa } = require('@vue/cli-shared-utils')
+    const { allProjectTargetsSupportModule } = require('../../util/targets')
+
+    let needsDifferentialLoading = args.target === 'app' && args.module
+    if (allProjectTargetsSupportModule) {
+      log(
+        `All browser targets in the browserslist configuration have supported ES module.\n` +
+        `Therefore we don't build two separate bundles for differential loading.\n`
+      )
+      needsDifferentialLoading = false
+    }
+
+    args.needsDifferentialLoading = needsDifferentialLoading
+    if (!needsDifferentialLoading) {
+      await build(args, api, options)
+      return
+    }
+
+    process.env.VUE_CLI_MODERN_MODE = true
+    if (!process.env.VUE_CLI_MODERN_BUILD) {
+      // main-process for legacy build
+      const legacyBuildArgs = { ...args, moduleBuild: false, keepAlive: true }
+      await build(legacyBuildArgs, api, options)
+
+      // spawn sub-process of self for modern build
+      const cliBin = require('path').resolve(__dirname, '../../../bin/vue-cli-service.js')
+      await execa('node', [cliBin, 'build', ...rawArgs], {
+        stdio: 'inherit',
+        env: {
+          VUE_CLI_MODERN_BUILD: true
+        }
+      })
+    } else {
+      // sub-process for modern build
+      const moduleBuildArgs = { ...args, moduleBuild: true, clean: false }
+      await build(moduleBuildArgs, api, options)
+    }
+  })
+}
+
+async function build (args, api, options) {
+  const fs = require('fs-extra')
+  const path = require('path')
+  const webpack = require('webpack')
+  const { chalk } = require('@vue/cli-shared-utils')
+  const formatStats = require('./formatStats')
+  const validateWebpackConfig = require('../../util/validateWebpackConfig')
+  const {
+    log,
+    done,
+    info,
+    logWithSpinner,
+    stopSpinner
+  } = require('@vue/cli-shared-utils')
+
+  log()
+  const mode = api.service.mode
+  if (args.target === 'app') {
+    const bundleTag = args.needsDifferentialLoading
+      ? args.moduleBuild
+        ? `module bundle `
+        : `legacy bundle `
+      : ``
+    logWithSpinner(`Building ${bundleTag}for ${mode}...`)
+  } else {
+    const buildMode = buildModes[args.target]
+    if (buildMode) {
+      const additionalParams = buildMode === 'library' ? ` (${args.formats})` : ``
+      logWithSpinner(`Building for ${mode} as ${buildMode}${additionalParams}...`)
+    } else {
+      throw new Error(`Unknown build target: ${args.target}`)
+    }
+  }
+
+  if (args.dest) {
+    // Override outputDir before resolving webpack config as config relies on it (#2327)
+    options.outputDir = args.dest
+  }
+
+  const targetDir = api.resolve(options.outputDir)
+  const isLegacyBuild = args.needsDifferentialLoading && !args.moduleBuild
+
+  // resolve raw webpack config
+  let webpackConfig
+  if (args.target === 'lib') {
+    webpackConfig = require('./resolveLibConfig')(api, args, options)
+  } else if (
+    args.target === 'wc' ||
+    args.target === 'wc-async'
+  ) {
+    webpackConfig = require('./resolveWcConfig')(api, args, options)
+  } else {
+    webpackConfig = require('./resolveAppConfig')(api, args, options)
+  }
+
+  // check for common config errors
+  validateWebpackConfig(webpackConfig, api, options, args.target)
+
+  if (args.watch) {
+    modifyConfig(webpackConfig, config => {
+      config.watch = true
+    })
+  }
+
+  if (args.stdin) {
+    process.stdin.on('end', () => {
+      process.exit(0)
+    })
+    process.stdin.resume()
+  }
+
+  // Expose advanced stats
+  if (args.dashboard) {
+    const DashboardPlugin = require('../../webpack/DashboardPlugin')
+    modifyConfig(webpackConfig, config => {
+      config.plugins.push(new DashboardPlugin({
+        type: 'build',
+        moduleBuild: args.moduleBuild,
+        keepAlive: args.keepAlive
+      }))
+    })
+  }
+
+  if (args.report || args['report-json']) {
+    const { BundleAnalyzerPlugin } = require('webpack-bundle-analyzer')
+    modifyConfig(webpackConfig, config => {
+      const bundleName = args.target !== 'app'
+        ? config.output.filename.replace(/\.js$/, '-')
+        : isLegacyBuild ? 'legacy-' : ''
+      config.plugins.push(new BundleAnalyzerPlugin({
+        logLevel: 'warn',
+        openAnalyzer: false,
+        analyzerMode: args.report ? 'static' : 'disabled',
+        reportFilename: `${bundleName}report.html`,
+        statsFilename: `${bundleName}report.json`,
+        generateStatsFile: !!args['report-json']
+      }))
+    })
+  }
+
+  if (args.clean) {
+    await fs.emptyDir(targetDir)
+  }
+
+  return new Promise((resolve, reject) => {
+    webpack(webpackConfig, (err, stats) => {
+      stopSpinner(false)
+      if (err) {
+        return reject(err)
+      }
+
+      if (stats.hasErrors()) {
+        return reject(new Error('Build failed with errors.'))
+      }
+
+      if (!args.silent) {
+        const targetDirShort = path.relative(
+          api.service.context,
+          targetDir
+        )
+        log(formatStats(stats, targetDirShort, api))
+        if (args.target === 'app' && !isLegacyBuild) {
+          if (!args.watch) {
+            done(`Build complete. The ${chalk.cyan(targetDirShort)} directory is ready to be deployed.`)
+            info(`Check out deployment instructions at ${chalk.cyan(`https://cli.vuejs.org/guide/deployment.html`)}\n`)
+          } else {
+            done(`Build complete. Watching for changes...`)
+          }
+        }
+      }
+
+      // test-only signal
+      if (process.env.VUE_CLI_TEST) {
+        console.log('Build complete.')
+      }
+
+      resolve()
+    })
+  })
+}
+
+module.exports.defaultModes = {
+  build: 'production'
+}