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69 lines
2.2 KiB
JavaScript
69 lines
2.2 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("../Compilation")} Compilation */
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/** @typedef {import("../Module").ReadOnlyRuntimeRequirements} ReadOnlyRuntimeRequirements */
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class EnsureChunkRuntimeModule extends RuntimeModule {
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/**
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* @param {ReadOnlyRuntimeRequirements} runtimeRequirements runtime requirements
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*/
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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 | null} runtime code
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*/
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generate() {
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const compilation = /** @type {Compilation} */ (this.compilation);
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const { runtimeTemplate } = compilation;
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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 withFetchPriority = this.runtimeRequirements.has(
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RuntimeGlobals.hasFetchPriority
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);
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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} = ${runtimeTemplate.basicFunction(
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`chunkId${withFetchPriority ? ", fetchPriority" : ""}`,
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[
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`return Promise.all(Object.keys(${handlers}).reduce(${runtimeTemplate.basicFunction(
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"promises, key",
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[
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`${handlers}[key](chunkId, promises${
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withFetchPriority ? ", fetchPriority" : ""
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});`,
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"return promises;"
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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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// 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} = ${runtimeTemplate.returningFunction(
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"Promise.resolve()"
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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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