webpack/lib/DllPlugin.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 Tobias Koppers @sokra
*/

"use strict";

const DllEntryPlugin = require("./DllEntryPlugin");
const FlagAllModulesAsUsedPlugin = require("./FlagAllModulesAsUsedPlugin");
const LibManifestPlugin = require("./LibManifestPlugin");
const createSchemaValidation = require("./util/create-schema-validation");

/** @typedef {import("../declarations/plugins/DllPlugin").DllPluginOptions} DllPluginOptions */
/** @typedef {import("./Compiler")} Compiler */

const validate = createSchemaValidation(
	require("../schemas/plugins/DllPlugin.check.js"),
	() => require("../schemas/plugins/DllPlugin.json"),
	{
		name: "Dll Plugin",
		baseDataPath: "options"
	}
);

class DllPlugin {
	/**
	 * @param {DllPluginOptions} options options object
	 */
	constructor(options) {
		validate(options);
		this.options = {
			...options,
			entryOnly: options.entryOnly !== false
		};
	}

	/**
	 * Apply the plugin
	 * @param {Compiler} compiler the compiler instance
	 * @returns {void}
	 */
	apply(compiler) {
		compiler.hooks.entryOption.tap("DllPlugin", (context, entry) => {
			if (typeof entry !== "function") {
				for (const name of Object.keys(entry)) {
					const options = {
						name,
						filename: entry.filename
					};
					new DllEntryPlugin(context, entry[name].import, options).apply(
						compiler
					);
				}
			} else {
				throw new Error(
					"DllPlugin doesn't support dynamic entry (function) yet"
				);
			}
			return true;
		});
		new LibManifestPlugin(this.options).apply(compiler);
		if (!this.options.entryOnly) {
			new FlagAllModulesAsUsedPlugin("DllPlugin").apply(compiler);
		}
	}
}

module.exports = DllPlugin;