Marc Mintel
5397309103
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55 lines
1.6 KiB
Plaintext
55 lines
1.6 KiB
Plaintext
/*
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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("../Chunk")} Chunk */
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/** @typedef {import("../Compilation")} Compilation */
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class ChunkPrefetchStartupRuntimeModule extends RuntimeModule {
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/**
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* @param {{ onChunks: Chunk[], chunks: Set<Chunk> }[]} startupChunks chunk ids to trigger when chunks are loaded
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*/
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constructor(startupChunks) {
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super("startup prefetch", RuntimeModule.STAGE_TRIGGER);
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this.startupChunks = startupChunks;
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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 { startupChunks } = this;
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const compilation = /** @type {Compilation} */ (this.compilation);
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const chunk = /** @type {Chunk} */ (this.chunk);
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const { runtimeTemplate } = compilation;
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return Template.asString(
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startupChunks.map(
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({ onChunks, chunks }) =>
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`${RuntimeGlobals.onChunksLoaded}(0, ${JSON.stringify(
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// This need to include itself to delay execution after this chunk has been fully loaded
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onChunks.filter((c) => c === chunk).map((c) => c.id)
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)}, ${runtimeTemplate.basicFunction(
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"",
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chunks.size < 3
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? Array.from(
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chunks,
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(c) =>
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`${RuntimeGlobals.prefetchChunk}(${JSON.stringify(c.id)});`
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)
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: `${JSON.stringify(Array.from(chunks, (c) => c.id))}.map(${
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RuntimeGlobals.prefetchChunk
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});`
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)}, 5);`
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)
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);
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}
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}
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module.exports = ChunkPrefetchStartupRuntimeModule;
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