init

马宇豪

2024-07-16 f591c27b57e2418c9495bc02ae8cfff84d35bc18

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/*
    MIT License http://www.opensource.org/licenses/mit-license.php
    Author Tobias Koppers @sokra
*/
 
"use strict";
 
const asyncLib = require("neo-async");
const EntryDependency = require("./dependencies/EntryDependency");
const { someInIterable } = require("./util/IterableHelpers");
const { compareModulesById } = require("./util/comparators");
const { dirname, mkdirp } = require("./util/fs");
 
/** @typedef {import("./Compiler")} Compiler */
 
/**
 * @typedef {Object} ManifestModuleData
 * @property {string | number} id
 * @property {Object} buildMeta
 * @property {boolean | string[]} exports
 */
 
class LibManifestPlugin {
    constructor(options) {
        this.options = options;
    }
 
    /**
     * Apply the plugin
     * @param {Compiler} compiler the compiler instance
     * @returns {void}
     */
    apply(compiler) {
        compiler.hooks.emit.tapAsync(
            "LibManifestPlugin",
            (compilation, callback) => {
                const moduleGraph = compilation.moduleGraph;
                asyncLib.forEach(
                    Array.from(compilation.chunks),
                    (chunk, callback) => {
                        if (!chunk.canBeInitial()) {
                            callback();
                            return;
                        }
                        const chunkGraph = compilation.chunkGraph;
                        const targetPath = compilation.getPath(this.options.path, {
                            chunk
                        });
                        const name =
                            this.options.name &&
                            compilation.getPath(this.options.name, {
                                chunk,
                                contentHashType: "javascript"
                            });
                        const content = Object.create(null);
                        for (const module of chunkGraph.getOrderedChunkModulesIterable(
                            chunk,
                            compareModulesById(chunkGraph)
                        )) {
                            if (
                                this.options.entryOnly &&
                                !someInIterable(
                                    moduleGraph.getIncomingConnections(module),
                                    c => c.dependency instanceof EntryDependency
                                )
                            ) {
                                continue;
                            }
                            const ident = module.libIdent({
                                context: this.options.context || compiler.options.context,
                                associatedObjectForCache: compiler.root
                            });
                            if (ident) {
                                const exportsInfo = moduleGraph.getExportsInfo(module);
                                const providedExports = exportsInfo.getProvidedExports();
                                /** @type {ManifestModuleData} */
                                const data = {
                                    id: chunkGraph.getModuleId(module),
                                    buildMeta: module.buildMeta,
                                    exports: Array.isArray(providedExports)
                                        ? providedExports
                                        : undefined
                                };
                                content[ident] = data;
                            }
                        }
                        const manifest = {
                            name,
                            type: this.options.type,
                            content
                        };
                        // Apply formatting to content if format flag is true;
                        const manifestContent = this.options.format
                            ? JSON.stringify(manifest, null, 2)
                            : JSON.stringify(manifest);
                        const buffer = Buffer.from(manifestContent, "utf8");
                        mkdirp(
                            compiler.intermediateFileSystem,
                            dirname(compiler.intermediateFileSystem, targetPath),
                            err => {
                                if (err) return callback(err);
                                compiler.intermediateFileSystem.writeFile(
                                    targetPath,
                                    buffer,
                                    callback
                                );
                            }
                        );
                    },
                    callback
                );
            }
        );
    }
}
module.exports = LibManifestPlugin;