init

马宇豪

2024-07-16 f591c27b57e2418c9495bc02ae8cfff84d35bc18

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/*
    MIT License http://www.opensource.org/licenses/mit-license.php
*/
 
"use strict";
 
const RuntimeGlobals = require("../RuntimeGlobals");
const RuntimeModule = require("../RuntimeModule");
const Template = require("../Template");
 
/** @typedef {import("../Chunk")} Chunk */
/** @typedef {import("../RuntimeTemplate")} RuntimeTemplate */
 
class ChunkPrefetchStartupRuntimeModule extends RuntimeModule {
    /**
     * @param {{ onChunks: Chunk[], chunks: Set<Chunk> }[]} startupChunks chunk ids to trigger when chunks are loaded
     */
    constructor(startupChunks) {
        super("startup prefetch", RuntimeModule.STAGE_TRIGGER);
        this.startupChunks = startupChunks;
    }
 
    /**
     * @returns {string} runtime code
     */
    generate() {
        const { startupChunks, chunk } = this;
        const { runtimeTemplate } = this.compilation;
        return Template.asString(
            startupChunks.map(
                ({ onChunks, chunks }) =>
                    `${RuntimeGlobals.onChunksLoaded}(0, ${JSON.stringify(
                        // This need to include itself to delay execution after this chunk has been fully loaded
                        onChunks.filter(c => c === chunk).map(c => c.id)
                    )}, ${runtimeTemplate.basicFunction(
                        "",
                        chunks.size < 3
                            ? Array.from(
                                    chunks,
                                    c =>
                                        `${RuntimeGlobals.prefetchChunk}(${JSON.stringify(c.id)});`
                              )
                            : `${JSON.stringify(Array.from(chunks, c => c.id))}.map(${
                                    RuntimeGlobals.prefetchChunk
                              });`
                    )}, 5);`
            )
        );
    }
}
 
module.exports = ChunkPrefetchStartupRuntimeModule;