mirror of https://github.com/webpack/webpack.git
96 lines
2.4 KiB
JavaScript
96 lines
2.4 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 RuntimeGlobals = require("../RuntimeGlobals");
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const RuntimeModule = require("../RuntimeModule");
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const Template = require("../Template");
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/** @typedef {import("../Compiler")} Compiler */
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class StartupChunkDependenciesPlugin {
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/**
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* @param {Compiler} compiler the compiler instance
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* @returns {void}
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*/
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apply(compiler) {
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compiler.hooks.thisCompilation.tap(
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"StartupChunkDependenciesPlugin",
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compilation => {
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compilation.hooks.additionalTreeRuntimeRequirements.tap(
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"StartupChunkDependenciesPlugin",
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(chunk, set) => {
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if (compilation.chunkGraph.hasChunkEntryDependentChunks(chunk)) {
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set.add(RuntimeGlobals.startup);
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set.add(RuntimeGlobals.ensureChunk);
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set.add(RuntimeGlobals.ensureChunkIncludeEntries);
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compilation.addRuntimeModule(
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chunk,
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new StartupChunkDependenciesRuntimeModule(
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chunk,
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compilation.chunkGraph
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)
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);
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}
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}
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);
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}
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);
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}
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}
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class StartupChunkDependenciesRuntimeModule extends RuntimeModule {
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constructor(chunk, chunkGraph) {
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super("startup chunk dependencies");
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this.chunk = chunk;
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this.chunkGraph = chunkGraph;
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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 { chunk, chunkGraph } = this;
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const chunkIds = Array.from(
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chunkGraph.getChunkEntryDependentChunksIterable(chunk)
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).map(chunk => {
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return chunk.id;
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});
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return Template.asString([
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`var next = ${RuntimeGlobals.startup};`,
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`${RuntimeGlobals.startup} = function() {`,
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Template.indent([
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chunkIds.length === 1
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? `return ${RuntimeGlobals.ensureChunk}(${JSON.stringify(
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chunkIds[0]
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)}).then(next);`
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: chunkIds.length > 2
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? Template.asString([
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// using map is shorter for 3 or more chunks
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`return Promise.all(${JSON.stringify(chunkIds)}.map(${
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RuntimeGlobals.ensureChunk
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}, __webpack_require__)).then(next);`
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])
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: Template.asString([
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// calling ensureChunk directly is shorter for 0 - 2 chunks
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"return Promise.all([",
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Template.indent(
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chunkIds
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.map(
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id =>
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`${RuntimeGlobals.ensureChunk}(${JSON.stringify(id)})`
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)
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.join(",\n")
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),
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"]).then(next);"
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])
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]),
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"}"
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]);
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}
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}
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module.exports = StartupChunkDependenciesPlugin;
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