243 lines
7.5 KiB
JavaScript
243 lines
7.5 KiB
JavaScript
/*
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MIT License http://www.opensource.org/licenses/mit-license.php
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*/
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"use strict";
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const { SyncWaterfallHook } = require("tapable");
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const Compilation = require("../Compilation");
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const RuntimeGlobals = require("../RuntimeGlobals");
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const RuntimeModule = require("../RuntimeModule");
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const Template = require("../Template");
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const {
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getChunkFilenameTemplate,
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chunkHasJs
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} = require("../javascript/JavascriptModulesPlugin");
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const { getInitialChunkIds } = require("../javascript/StartupHelpers");
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const compileBooleanMatcher = require("../util/compileBooleanMatcher");
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const { getUndoPath } = require("../util/identifier");
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/** @typedef {import("../Chunk")} Chunk */
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/**
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* @typedef {Object} JsonpCompilationPluginHooks
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* @property {SyncWaterfallHook<[string, Chunk]>} linkPreload
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* @property {SyncWaterfallHook<[string, Chunk]>} linkPrefetch
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*/
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/** @type {WeakMap<Compilation, JsonpCompilationPluginHooks>} */
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const compilationHooksMap = new WeakMap();
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class ModuleChunkLoadingRuntimeModule extends RuntimeModule {
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/**
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* @param {Compilation} compilation the compilation
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* @returns {JsonpCompilationPluginHooks} hooks
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*/
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static getCompilationHooks(compilation) {
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if (!(compilation instanceof Compilation)) {
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throw new TypeError(
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"The 'compilation' argument must be an instance of Compilation"
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);
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}
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let hooks = compilationHooksMap.get(compilation);
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if (hooks === undefined) {
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hooks = {
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linkPreload: new SyncWaterfallHook(["source", "chunk"]),
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linkPrefetch: new SyncWaterfallHook(["source", "chunk"])
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};
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compilationHooksMap.set(compilation, hooks);
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}
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return hooks;
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}
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constructor(runtimeRequirements) {
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super("import chunk loading", RuntimeModule.STAGE_ATTACH);
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this._runtimeRequirements = runtimeRequirements;
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}
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/**
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* @private
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* @param {Chunk} chunk chunk
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* @param {string} rootOutputDir root output directory
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* @returns {string} generated code
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*/
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_generateBaseUri(chunk, rootOutputDir) {
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const options = chunk.getEntryOptions();
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if (options && options.baseUri) {
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return `${RuntimeGlobals.baseURI} = ${JSON.stringify(options.baseUri)};`;
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}
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const {
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compilation: {
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outputOptions: { importMetaName }
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}
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} = this;
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return `${RuntimeGlobals.baseURI} = new URL(${JSON.stringify(
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rootOutputDir
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)}, ${importMetaName}.url);`;
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}
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/**
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* @returns {string} runtime code
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*/
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generate() {
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const { compilation, chunk, chunkGraph } = this;
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const {
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runtimeTemplate,
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outputOptions: { importFunctionName }
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} = compilation;
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const fn = RuntimeGlobals.ensureChunkHandlers;
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const withBaseURI = this._runtimeRequirements.has(RuntimeGlobals.baseURI);
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const withExternalInstallChunk = this._runtimeRequirements.has(
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RuntimeGlobals.externalInstallChunk
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);
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const withLoading = this._runtimeRequirements.has(
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RuntimeGlobals.ensureChunkHandlers
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);
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const withOnChunkLoad = this._runtimeRequirements.has(
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RuntimeGlobals.onChunksLoaded
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);
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const withHmr = this._runtimeRequirements.has(
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RuntimeGlobals.hmrDownloadUpdateHandlers
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);
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const conditionMap = chunkGraph.getChunkConditionMap(chunk, chunkHasJs);
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const hasJsMatcher = compileBooleanMatcher(conditionMap);
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const initialChunkIds = getInitialChunkIds(chunk, chunkGraph, chunkHasJs);
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const outputName = this.compilation.getPath(
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getChunkFilenameTemplate(chunk, this.compilation.outputOptions),
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{
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chunk,
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contentHashType: "javascript"
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}
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);
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const rootOutputDir = getUndoPath(
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outputName,
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this.compilation.outputOptions.path,
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true
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);
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const stateExpression = withHmr
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? `${RuntimeGlobals.hmrRuntimeStatePrefix}_module`
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: undefined;
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return Template.asString([
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withBaseURI
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? this._generateBaseUri(chunk, rootOutputDir)
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: "// no baseURI",
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"",
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"// object to store loaded and loading chunks",
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"// undefined = chunk not loaded, null = chunk preloaded/prefetched",
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"// [resolve, reject, Promise] = chunk loading, 0 = chunk loaded",
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`var installedChunks = ${
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stateExpression ? `${stateExpression} = ${stateExpression} || ` : ""
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}{`,
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Template.indent(
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Array.from(initialChunkIds, id => `${JSON.stringify(id)}: 0`).join(
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",\n"
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)
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),
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"};",
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"",
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withLoading || withExternalInstallChunk
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? `var installChunk = ${runtimeTemplate.basicFunction("data", [
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runtimeTemplate.destructureObject(
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["ids", "modules", "runtime"],
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"data"
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),
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'// add "modules" to the modules object,',
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'// then flag all "ids" as loaded and fire callback',
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"var moduleId, chunkId, i = 0;",
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"for(moduleId in modules) {",
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Template.indent([
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`if(${RuntimeGlobals.hasOwnProperty}(modules, moduleId)) {`,
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Template.indent(
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`${RuntimeGlobals.moduleFactories}[moduleId] = modules[moduleId];`
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),
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"}"
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]),
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"}",
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"if(runtime) runtime(__webpack_require__);",
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"for(;i < ids.length; i++) {",
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Template.indent([
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"chunkId = ids[i];",
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`if(${RuntimeGlobals.hasOwnProperty}(installedChunks, chunkId) && installedChunks[chunkId]) {`,
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Template.indent("installedChunks[chunkId][0]();"),
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"}",
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"installedChunks[ids[i]] = 0;"
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]),
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"}",
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withOnChunkLoad ? `${RuntimeGlobals.onChunksLoaded}();` : ""
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])}`
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: "// no install chunk",
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"",
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withLoading
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? Template.asString([
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`${fn}.j = ${runtimeTemplate.basicFunction(
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"chunkId, promises",
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hasJsMatcher !== false
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? Template.indent([
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"// import() chunk loading for javascript",
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`var installedChunkData = ${RuntimeGlobals.hasOwnProperty}(installedChunks, chunkId) ? installedChunks[chunkId] : undefined;`,
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'if(installedChunkData !== 0) { // 0 means "already installed".',
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Template.indent([
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"",
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'// a Promise means "currently loading".',
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"if(installedChunkData) {",
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Template.indent([
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"promises.push(installedChunkData[1]);"
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]),
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"} else {",
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Template.indent([
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hasJsMatcher === true
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? "if(true) { // all chunks have JS"
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: `if(${hasJsMatcher("chunkId")}) {`,
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Template.indent([
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"// setup Promise in chunk cache",
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`var promise = ${importFunctionName}(${JSON.stringify(
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rootOutputDir
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)} + ${
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RuntimeGlobals.getChunkScriptFilename
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}(chunkId)).then(installChunk, ${runtimeTemplate.basicFunction(
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"e",
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[
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"if(installedChunks[chunkId] !== 0) installedChunks[chunkId] = undefined;",
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"throw e;"
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]
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)});`,
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`var promise = Promise.race([promise, new Promise(${runtimeTemplate.expressionFunction(
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`installedChunkData = installedChunks[chunkId] = [resolve]`,
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"resolve"
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)})])`,
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`promises.push(installedChunkData[1] = promise);`
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]),
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"} else installedChunks[chunkId] = 0;"
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]),
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"}"
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]),
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"}"
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])
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: Template.indent(["installedChunks[chunkId] = 0;"])
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)};`
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])
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: "// no chunk on demand loading",
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"",
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withExternalInstallChunk
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? Template.asString([
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`${RuntimeGlobals.externalInstallChunk} = installChunk;`
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])
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: "// no external install chunk",
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"",
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withOnChunkLoad
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? `${
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RuntimeGlobals.onChunksLoaded
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}.j = ${runtimeTemplate.returningFunction(
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"installedChunks[chunkId] === 0",
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"chunkId"
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)};`
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: "// no on chunks loaded"
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]);
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}
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}
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module.exports = ModuleChunkLoadingRuntimeModule;
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