webpack/lib/DynamicEntryPlugin.js

Packs ECMAScript/CommonJs/AMD modules for the browser. Allows you to split your codebase into multiple bundles, which can be loaded on demand. Supports loaders to preprocess files, i.e. json, jsx, es7, css, less, ... and your custom stuff.

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

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

	/**
	 * Apply the plugin
	 * @param {Compiler} compiler the compiler instance
	 * @returns {void}
	 */
	apply(compiler) {
		compiler.hooks.compilation.tap(
			"DynamicEntryPlugin",
			(compilation, { normalModuleFactory }) => {
				compilation.dependencyFactories.set(
					EntryDependency,
					normalModuleFactory
				);
			}
		);

		compiler.hooks.make.tapPromise(
			"DynamicEntryPlugin",
			(compilation, callback) =>
				Promise.resolve(this.entry())
					.then(entry => {
						const promises = [];
						for (const name of Object.keys(entry)) {
							const desc = entry[name];
							const options = EntryOptionPlugin.entryDescriptionToOptions(
								compiler,
								name,
								desc
							);
							for (const entry of desc.import) {
								promises.push(
									new Promise((resolve, reject) => {
										compilation.addEntry(
											this.context,
											EntryPlugin.createDependency(entry, options),
											options,
											err => {
												if (err) return reject(err);
												resolve();
											}
										);
									})
								);
							}
						}
						return Promise.all(promises);
					})
					.then(x => {})
		);
	}
}

module.exports = DynamicEntryPlugin;