webpack/lib/EntryOptionPlugin.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 Tobias Koppers @sokra
*/
"use strict";

const SingleEntryPlugin = require("./SingleEntryPlugin");
const MultiEntryPlugin = require("./MultiEntryPlugin");
const DynamicEntryPlugin = require("./DynamicEntryPlugin");

/** @typedef {import("../declarations/WebpackOptions").EntryItem} EntryItem */
/** @typedef {import("./Compiler")} Compiler */

/**
 * @param {string} context context path
 * @param {EntryItem} item entry array or single path
 * @param {string} name entry key name
 * @returns {SingleEntryPlugin | MultiEntryPlugin} returns either a single or multi entry plugin
 */
const itemToPlugin = (context, item, name) => {
	if (Array.isArray(item)) {
		return new MultiEntryPlugin(context, item, name);
	}
	return new SingleEntryPlugin(context, item, name);
};

module.exports = class EntryOptionPlugin {
	/**
	 * @param {Compiler} compiler the compiler instance one is tapping into
	 * @returns {void}
	 */
	apply(compiler) {
		compiler.hooks.entryOption.tap("EntryOptionPlugin", (context, entry) => {
			if (typeof entry === "string" || Array.isArray(entry)) {
				itemToPlugin(context, entry, "main").apply(compiler);
			} else if (typeof entry === "object") {
				for (const name of Object.keys(entry)) {
					itemToPlugin(context, entry[name], name).apply(compiler);
				}
			} else if (typeof entry === "function") {
				new DynamicEntryPlugin(context, entry).apply(compiler);
			}
			return true;
		});
	}
};