mirror of
https://github.com/facebook/react-native.git
synced 2025-11-01 09:14:26 +00:00
Martín Bigio
8edc35004c
Summary:We found that moving the preloaded modules to the startup section of the RAM Bundle improves TTI quite a bit by saving lots of through the bridge calls and injecting multiple modules at once on JSC. However, doing this on a non hacky way required a lot of work. The main changes this diff does are: - Add to `BundleBase` additional bundling options. This options are fetched based on the entry file we're building by invoking a module that exports a function (`getBundleOptionsModulePath`). - Implement `BundleOptions` module to include the `numPreloadedModules` attribute as a bundle additional option. This value is computed by getting the dependencies the entry file has and looking for the first module that exports a module we don't want to preload. The `numPreloadedModules` attribute is then used to decide where to splice the array of modules. - Additional kung fu to make sure sourcemaps work for both preloaded and non preloaded modules. Reviewed By: davidaurelio Differential Revision: D3046534 fb-gh-sync-id: 80b676222ca3bb8b9eecc912a7963be94d3dee1a shipit-source-id: 80b676222ca3bb8b9eecc912a7963be94d3dee1a
106 lines
2.2 KiB
JavaScript
106 lines
2.2 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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const ModuleTransport = require('../lib/ModuleTransport');
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class BundleBase {
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constructor() {
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this._finalized = false;
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this._modules = [];
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this._assets = [];
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this._mainModuleId = undefined;
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}
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isEmpty() {
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return this._modules.length === 0 && this._assets.length === 0;
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}
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getMainModuleId() {
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return this._mainModuleId;
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}
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setMainModuleId(moduleId) {
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this._mainModuleId = moduleId;
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}
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addModule(module) {
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if (!(module instanceof ModuleTransport)) {
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throw new Error('Expeceted a ModuleTransport object');
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}
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return this._modules.push(module) - 1;
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}
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replaceModuleAt(index, module) {
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if (!(module instanceof ModuleTransport)) {
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throw new Error('Expeceted a ModuleTransport object');
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}
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this._modules[index] = module;
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}
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getModules() {
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return this._modules;
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}
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getAssets() {
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return this._assets;
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}
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addAsset(asset) {
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this._assets.push(asset);
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}
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finalize(options) {
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Object.freeze(this._modules);
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Object.freeze(this._assets);
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this._finalized = true;
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}
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getSource(options) {
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this.assertFinalized();
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if (this._source) {
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return this._source;
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}
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this._source = this._modules.map((module) => module.code).join('\n');
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return this._source;
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}
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assertFinalized(message) {
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if (!this._finalized) {
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throw new Error(message || 'Bundle needs to be finalized before getting any source');
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}
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}
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toJSON() {
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return {
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modules: this._modules,
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assets: this._assets,
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mainModuleId: this.getMainModuleId(),
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};
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}
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static fromJSON(bundle, json) {
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bundle._assets = json.assets;
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bundle._modules = json.modules;
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bundle.setMainModuleId(json.mainModuleId);
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Object.freeze(bundle._modules);
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Object.freeze(bundle._assets);
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bundle._finalized = true;
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}
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}
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module.exports = BundleBase;
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