mirror of https://github.com/webpack/webpack.git
50 lines
1.6 KiB
JavaScript
50 lines
1.6 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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class EnsureChunkRuntimeModule extends RuntimeModule {
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constructor(runtimeRequirements) {
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super("ensure chunk");
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this.runtimeRequirements = runtimeRequirements;
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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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// Check if there are non initial chunks which need to be imported using require-ensure
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if (this.runtimeRequirements.has(RuntimeGlobals.ensureChunkHandlers)) {
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const handlers = RuntimeGlobals.ensureChunkHandlers;
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return Template.asString([
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`${handlers} = {};`,
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"// This file contains only the entry chunk.",
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"// The chunk loading function for additional chunks",
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`${RuntimeGlobals.ensureChunk} = function requireEnsure(chunkId) {`,
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Template.indent([
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`return Promise.all(Object.keys(${handlers}).reduce(function(promises, key) { ${handlers}[key](chunkId, promises); return promises; }, []));`
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]),
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"};"
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]);
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} else {
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// There ensureChunk is used somewhere in the tree, so we need an empty requireEnsure
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// function. This can happen with multiple entrypoints.
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return Template.asString([
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"// The chunk loading function for additional chunks",
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"// Since all referenced chunks are already included",
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"// in this file, this function is empty here.",
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`${RuntimeGlobals.ensureChunk} = function requireEnsure() {`,
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Template.indent("return Promise.resolve();"),
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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 = EnsureChunkRuntimeModule;
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