source: frontend/node_modules/webpack/lib/DynamicEntryPlugin.js

/*
        MIT License http://www.opensource.org/licenses/mit-license.php
        Author Naoyuki Kanezawa @nkzawa
*/

"use strict";

const EntryOptionPlugin = require("./EntryOptionPlugin");
const EntryPlugin = require("./EntryPlugin");
const EntryDependency = require("./dependencies/EntryDependency");

/** @typedef {import("../declarations/WebpackOptions").EntryDescriptionNormalized} EntryDescriptionNormalized */
/** @typedef {import("../declarations/WebpackOptions").EntryStatic} EntryStatic */
/** @typedef {import("../declarations/WebpackOptions").EntryStaticNormalized} EntryStaticNormalized */
/** @typedef {import("./Compiler")} Compiler */

const PLUGIN_NAME = "DynamicEntryPlugin";

/** @typedef {() => EntryStatic | Promise<EntryStatic>} RawEntryDynamic */
/** @typedef {() => Promise<EntryStaticNormalized>} EntryDynamic */

class DynamicEntryPlugin {
        /**
         * Creates an instance of DynamicEntryPlugin.
         * @param {string} context the context path
         * @param {EntryDynamic} entry the entry value
         */
        constructor(context, entry) {
                /** @type {string} */
                this.context = context;
                /** @type {EntryDynamic} */
                this.entry = entry;
        }

        /**
         * Applies the plugin by registering its hooks on the compiler.
         * @param {Compiler} compiler the compiler instance
         * @returns {void}
         */
        apply(compiler) {
                compiler.hooks.compilation.tap(
                        PLUGIN_NAME,
                        (compilation, { normalModuleFactory }) => {
                                compilation.dependencyFactories.set(
                                        EntryDependency,
                                        normalModuleFactory
                                );
                        }
                );

                compiler.hooks.make.tapPromise(PLUGIN_NAME, (compilation) =>
                        Promise.resolve(this.entry())
                                .then((entry) => {
                                        /** @type {Promise<void>[]} */
                                        const promises = [];
                                        for (const name of Object.keys(entry)) {
                                                const desc = entry[name];
                                                const options = EntryOptionPlugin.entryDescriptionToOptions(
                                                        compiler,
                                                        name,
                                                        desc
                                                );
                                                for (const entry of /** @type {NonNullable<EntryDescriptionNormalized["import"]>} */ (
                                                        desc.import
                                                )) {
                                                        promises.push(
                                                                new Promise(
                                                                        /**
                                                                         * Handles the callback logic for this hook.
                                                                         * @param {(value?: undefined) => void} resolve resolve
                                                                         * @param {(reason?: Error) => void} reject reject
                                                                         */
                                                                        (resolve, reject) => {
                                                                                compilation.addEntry(
                                                                                        this.context,
                                                                                        EntryPlugin.createDependency(entry, options),
                                                                                        options,
                                                                                        (err) => {
                                                                                                if (err) return reject(err);
                                                                                                resolve();
                                                                                        }
                                                                                );
                                                                        }
                                                                )
                                                        );
                                                }
                                        }
                                        return Promise.all(promises);
                                })
                                .then(() => {})
                );
        }
}

module.exports = DynamicEntryPlugin;