react-native/local-cli/bundle/buildBundle.js

/**
 * 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.
 *
 * @format
 * @flow
 */

'use strict';

const log = require('../util/log').out('bundle');
/* $FlowFixMe(site=react_native_oss) */
const Server = require('metro/src/Server');
const {Terminal} = require('metro-core');
const TerminalReporter = require('metro/src/lib/TerminalReporter');

const {defaults} = require('metro');
/* $FlowFixMe(site=react_native_oss) */
const outputBundle = require('metro/src/shared/output/bundle');
const path = require('path');
const saveAssets = require('./saveAssets');

const {ASSET_REGISTRY_PATH} = require('../core/Constants');

import type {RequestOptions, OutputOptions} from './types.flow';
import type {ConfigT} from 'metro';

const defaultAssetExts = defaults.assetExts;
const defaultSourceExts = defaults.sourceExts;
const defaultPlatforms = defaults.platforms;
const defaultProvidesModuleNodeModules = defaults.providesModuleNodeModules;

async function buildBundle(
  args: OutputOptions & {
    assetsDest: mixed,
    entryFile: string,
    maxWorkers: number,
    resetCache: boolean,
    transformer: string,
    minify: boolean,
  },
  config: ConfigT,
  output = outputBundle,
) {
  // This is used by a bazillion of npm modules we don't control so we don't
  // have other choice than defining it as an env variable here.
  process.env.NODE_ENV = args.dev ? 'development' : 'production';

  let sourceMapUrl = args.sourcemapOutput;
  if (sourceMapUrl && !args.sourcemapUseAbsolutePath) {
    sourceMapUrl = path.basename(sourceMapUrl);
  }

  const requestOpts: RequestOptions = {
    entryFile: args.entryFile,
    sourceMapUrl,
    dev: args.dev,
    minify: args.minify !== undefined ? args.minify : !args.dev,
    platform: args.platform,
  };

  const assetExts = (config.getAssetExts && config.getAssetExts()) || [];
  const sourceExts = (config.getSourceExts && config.getSourceExts()) || [];
  const platforms = (config.getPlatforms && config.getPlatforms()) || [];

  const transformModulePath = args.transformer
    ? path.resolve(args.transformer)
    : config.getTransformModulePath();

  const providesModuleNodeModules =
    typeof config.getProvidesModuleNodeModules === 'function'
      ? config.getProvidesModuleNodeModules()
      : defaultProvidesModuleNodeModules;

  const terminal = new Terminal(process.stdout);
  const server = new Server({
    asyncRequireModulePath: config.getAsyncRequireModulePath(),
    assetExts: defaultAssetExts.concat(assetExts),
    assetRegistryPath: ASSET_REGISTRY_PATH,
    blacklistRE: config.getBlacklistRE(),
    cacheStores: config.cacheStores,
    cacheVersion: config.cacheVersion,
    dynamicDepsInPackages: config.dynamicDepsInPackages,
    enableBabelRCLookup: config.getEnableBabelRCLookup(),
    extraNodeModules: config.extraNodeModules,
    getModulesRunBeforeMainModule: config.getModulesRunBeforeMainModule,
    getPolyfills: config.getPolyfills,
    getResolverMainFields: config.getResolverMainFields,
    getRunModuleStatement: config.getRunModuleStatement,
    getTransformOptions: config.getTransformOptions,
    hasteImplModulePath: config.hasteImplModulePath,
    maxWorkers: args.maxWorkers,
    platforms: defaultPlatforms.concat(platforms),
    postMinifyProcess: config.postMinifyProcess,
    postProcessBundleSourcemap: config.postProcessBundleSourcemap,
    projectRoot: config.getProjectRoot(),
    providesModuleNodeModules: providesModuleNodeModules,
    reporter: new TerminalReporter(terminal),
    resetCache: args.resetCache,
    resolveRequest: config.resolveRequest,
    sourceExts: sourceExts.concat(defaultSourceExts),
    transformModulePath: transformModulePath,
    watch: false,
    watchFolders: config.getWatchFolders(),
    workerPath: config.getWorkerPath && config.getWorkerPath(),
  });

  try {
    const bundle = await output.build(server, requestOpts);

    await output.save(bundle, args, log);

    // Save the assets of the bundle
    const outputAssets = await server.getAssets({
      ...Server.DEFAULT_BUNDLE_OPTIONS,
      ...requestOpts,
      bundleType: 'todo',
    });

    // When we're done saving bundle output and the assets, we're done.
    return await saveAssets(outputAssets, args.platform, args.assetsDest);
  } finally {
    server.end();
  }
}

module.exports = buildBundle;