source: trip-planner-front/node_modules/webpack/lib/LibManifestPlugin.js

/*
        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
                                                        });
                                                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;