初始化

cnf

2025-05-10 386fa0eca75ddc88165f9b73038f2a2239e1072e

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/*
    MIT License http://www.opensource.org/licenses/mit-license.php
    Author Tobias Koppers @sokra
*/
 
"use strict";
 
const RuntimeGlobals = require("../RuntimeGlobals");
const RuntimeModule = require("../RuntimeModule");
const Template = require("../Template");
 
/** @typedef {import("../Chunk")} Chunk */
/** @typedef {import("../ChunkGraph")} ChunkGraph */
/** @typedef {import("../Compilation")} Compilation */
 
class StartupChunkDependenciesRuntimeModule extends RuntimeModule {
    /**
     * @param {boolean} asyncChunkLoading use async chunk loading
     */
    constructor(asyncChunkLoading) {
        super("startup chunk dependencies", RuntimeModule.STAGE_TRIGGER);
        this.asyncChunkLoading = asyncChunkLoading;
    }
 
    /**
     * @returns {string | null} runtime code
     */
    generate() {
        const chunkGraph = /** @type {ChunkGraph} */ (this.chunkGraph);
        const chunk = /** @type {Chunk} */ (this.chunk);
        const chunkIds = Array.from(
            chunkGraph.getChunkEntryDependentChunksIterable(chunk)
        ).map(chunk => chunk.id);
        const compilation = /** @type {Compilation} */ (this.compilation);
        const { runtimeTemplate } = compilation;
        return Template.asString([
            `var next = ${RuntimeGlobals.startup};`,
            `${RuntimeGlobals.startup} = ${runtimeTemplate.basicFunction(
                "",
                !this.asyncChunkLoading
                    ? chunkIds
                            .map(
                                id => `${RuntimeGlobals.ensureChunk}(${JSON.stringify(id)});`
                            )
                            .concat("return next();")
                    : chunkIds.length === 1
                        ? `return ${RuntimeGlobals.ensureChunk}(${JSON.stringify(
                                chunkIds[0]
                            )}).then(next);`
                        : chunkIds.length > 2
                            ? [
                                    // using map is shorter for 3 or more chunks
                                    `return Promise.all(${JSON.stringify(chunkIds)}.map(${
                                        RuntimeGlobals.ensureChunk
                                    }, ${RuntimeGlobals.require})).then(next);`
                                ]
                            : [
                                    // calling ensureChunk directly is shorter for 0 - 2 chunks
                                    "return Promise.all([",
                                    Template.indent(
                                        chunkIds
                                            .map(
                                                id =>
                                                    `${RuntimeGlobals.ensureChunk}(${JSON.stringify(id)})`
                                            )
                                            .join(",\n")
                                    ),
                                    "]).then(next);"
                                ]
            )};`
        ]);
    }
}
 
module.exports = StartupChunkDependenciesRuntimeModule;