webpack/lib/DynamicEntryPlugin.js

Packs CommonJs/AMD modules for the browser. Allows to split your codebase into multiple bundles, which can be loaded on demand. Support 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 MultiEntryDependency = require("./dependencies/MultiEntryDependency");
const SingleEntryDependency = require("./dependencies/SingleEntryDependency");
const MultiModuleFactory = require("./MultiModuleFactory");
const MultiEntryPlugin = require("./MultiEntryPlugin");
const SingleEntryPlugin = require("./SingleEntryPlugin");

/** @typedef {import("../declarations/WebpackOptions").EntryDynamic} EntryDynamic */
/** @typedef {import("../declarations/WebpackOptions").EntryStatic} 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;
	}

	/**
	 * @param {Compiler} compiler the compiler instance
	 * @returns {void}
	 */
	apply(compiler) {
		compiler.hooks.compilation.tap(
			"DynamicEntryPlugin",
			(compilation, { normalModuleFactory }) => {
				const multiModuleFactory = new MultiModuleFactory();

				compilation.dependencyFactories.set(
					MultiEntryDependency,
					multiModuleFactory
				);
				compilation.dependencyFactories.set(
					SingleEntryDependency,
					normalModuleFactory
				);
			}
		);

		compiler.hooks.make.tapAsync(
			"DynamicEntryPlugin",
			(compilation, callback) => {
				/**
				 * @param {string|string[]} entry entry value or array of entry values
				 * @param {string} name name of entry
				 * @returns {Promise<EntryStatic>} returns the promise resolving the Compilation#addEntry function
				 */
				const addEntry = (entry, name) => {
					const dep = DynamicEntryPlugin.createDependency(entry, name);
					return new Promise((resolve, reject) => {
						compilation.addEntry(this.context, dep, name, err => {
							if (err) return reject(err);
							resolve();
						});
					});
				};

				Promise.resolve(this.entry()).then(entry => {
					if (typeof entry === "string" || Array.isArray(entry)) {
						addEntry(entry, "main").then(() => callback(), callback);
					} else if (typeof entry === "object") {
						Promise.all(
							Object.keys(entry).map(name => {
								return addEntry(entry[name], name);
							})
						).then(() => callback(), callback);
					}
				});
			}
		);
	}
}

module.exports = DynamicEntryPlugin;
/**
 * @param {string|string[]} entry entry value or array of entry paths
 * @param {string} name name of entry
 * @returns {SingleEntryDependency|MultiEntryDependency} returns dep
 */
DynamicEntryPlugin.createDependency = (entry, name) => {
	if (Array.isArray(entry)) {
		return MultiEntryPlugin.createDependency(entry, name);
	} else {
		return SingleEntryPlugin.createDependency(entry, name);
	}
};