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3f969cb1db
Summary: We have found that it is useful to work with production rather than dev bundles when working on e.g. performance and animation tuning. For a larger app, `react-native bundle` with `--dev false` can get very slow due to minification - in our case, this was especially true of library code (e.g. the AWS SDK taking nearly 15 secs to minify on a top-spec MBP 15"). This is fine when just building every now and then, but when making frequent changes and rebuilding, it becomes quite painful. Currently there is no way to perform a release (non-dev) build, with minification disabled. This PR adds an optional `--minify` flag to enable developers to disable minification, reducing build times significantly for our use case. Checked output bundle size, to ensure behaviour stays the same as the existing default when `--minify` is not specified, and that the `minify` flag gets passed through to Metro bundler correctly if specified. N/A [GENERAL] [ENHANCEMENT] [Bundler] - Added optional --minify flag to bundler Closes https://github.com/facebook/react-native/pull/17702 Differential Revision: D6806356 Pulled By: shergin fbshipit-source-id: c466a2dea692561f8b2002118662c3affc71b991
73 lines
2.7 KiB
JavaScript
73 lines
2.7 KiB
JavaScript
/**
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* Copyright (c) 2015-present, Facebook, Inc.
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* All rights reserved.
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*
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* This source code is licensed under the BSD-style license found in the
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* LICENSE file in the root directory of this source tree. An additional grant
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* of patent rights can be found in the PATENTS file in the same directory.
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*/
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'use strict';
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module.exports = [
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{
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command: '--entry-file <path>',
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description: 'Path to the root JS file, either absolute or relative to JS root',
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}, {
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command: '--platform [string]',
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description: 'Either "ios" or "android"',
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default: 'ios',
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}, {
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command: '--transformer [string]',
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description: 'Specify a custom transformer to be used',
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}, {
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command: '--dev [boolean]',
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description: 'If false, warnings are disabled and the bundle is minified',
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parse: (val) => val === 'false' ? false : true,
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default: true,
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}, {
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command: '--minify [boolean]',
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description: 'Allows overriding whether bundle is minified. This defaults to ' +
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'false if dev is true, and true if dev is false. Disabling minification ' +
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'can be useful for speeding up production builds for testing purposes.',
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parse: (val) => val === 'false' ? false : true,
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}, {
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command: '--bundle-output <string>',
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description: 'File name where to store the resulting bundle, ex. /tmp/groups.bundle',
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}, {
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command: '--bundle-encoding [string]',
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description: 'Encoding the bundle should be written in (https://nodejs.org/api/buffer.html#buffer_buffer).',
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default: 'utf8',
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}, {
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command: '--max-workers [number]',
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description: 'Specifies the maximum number of workers the worker-pool ' +
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'will spawn for transforming files. This defaults to the number of the ' +
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'cores available on your machine.',
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parse: (workers: string) => Number(workers),
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}, {
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command: '--sourcemap-output [string]',
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description: 'File name where to store the sourcemap file for resulting bundle, ex. /tmp/groups.map',
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}, {
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command: '--sourcemap-sources-root [string]',
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description: 'Path to make sourcemap\'s sources entries relative to, ex. /root/dir',
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}, {
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command: '--sourcemap-use-absolute-path',
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description: 'Report SourceMapURL using its full path',
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default: false,
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}, {
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command: '--assets-dest [string]',
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description: 'Directory name where to store assets referenced in the bundle',
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}, {
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command: '--verbose',
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description: 'Enables logging',
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default: false,
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}, {
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command: '--reset-cache',
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description: 'Removes cached files',
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default: false,
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}, {
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command: '--read-global-cache',
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description: 'Try to fetch transformed JS code from the global cache, if configured.',
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default: false,
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},
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];
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