mirror of https://github.com/webpack/webpack.git
78 lines
2.2 KiB
JavaScript
78 lines
2.2 KiB
JavaScript
/*
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MIT License http://www.opensource.org/licenses/mit-license.php
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Author Tobias Koppers @sokra
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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("../Chunk")} Chunk */
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/** @typedef {import("../ChunkGraph")} ChunkGraph */
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/** @typedef {import("../Compilation")} Compilation */
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class StartupChunkDependenciesRuntimeModule extends RuntimeModule {
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/**
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* @param {boolean} asyncChunkLoading use async chunk loading
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*/
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constructor(asyncChunkLoading) {
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super("startup chunk dependencies", RuntimeModule.STAGE_TRIGGER);
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this.asyncChunkLoading = asyncChunkLoading;
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}
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/**
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* @returns {string | null} runtime code
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*/
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generate() {
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const chunkGraph = /** @type {ChunkGraph} */ (this.chunkGraph);
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const chunk = /** @type {Chunk} */ (this.chunk);
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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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const compilation = /** @type {Compilation} */ (this.compilation);
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const { runtimeTemplate } = compilation;
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return Template.asString([
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`var next = ${RuntimeGlobals.startup};`,
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`${RuntimeGlobals.startup} = ${runtimeTemplate.basicFunction(
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"",
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!this.asyncChunkLoading
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? chunkIds
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.map(
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id => `${RuntimeGlobals.ensureChunk}(${JSON.stringify(id)});`
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)
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.concat("return next();")
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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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? [
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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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}, ${RuntimeGlobals.require})).then(next);`
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]
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: [
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// calling ensureChunk directly is shorter for 0 - 2 chunks
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"return Promise.all([",
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Template.indent(
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chunkIds
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.map(
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id =>
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`${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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module.exports = StartupChunkDependenciesRuntimeModule;
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