webpack/lib/optimize/RuntimeChunkPlugin.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";

/** @typedef {import("../Compilation").EntryData} EntryData */
/** @typedef {import("../Compiler")} Compiler */

const PLUGIN_NAME = "RuntimeChunkPlugin";

/** @typedef {(entrypoint: { name: string }) => string} RuntimeChunkFunction */

class RuntimeChunkPlugin {
	/**
	 * Creates an instance of RuntimeChunkPlugin.
	 * @param {{ name?: RuntimeChunkFunction }=} options options
	 */
	constructor(options = {}) {
		/** @type {{ name: string | RuntimeChunkFunction }} */
		this.options = {
			name: (entrypoint) => `runtime~${entrypoint.name}`,
			...options
		};
	}

	/**
	 * Applies the plugin by registering its hooks on the compiler.
	 * @param {Compiler} compiler the compiler instance
	 * @returns {void}
	 */
	apply(compiler) {
		compiler.hooks.thisCompilation.tap(PLUGIN_NAME, (compilation) => {
			compilation.hooks.addEntry.tap(PLUGIN_NAME, (_, { name: entryName }) => {
				if (entryName === undefined) return;
				const data =
					/** @type {EntryData} */
					(compilation.entries.get(entryName));
				if (data.options.runtime === undefined && !data.options.dependOn) {
					// Determine runtime chunk name
					let name = this.options.name;
					if (typeof name === "function") {
						name = name({ name: entryName });
					}
					data.options.runtime = name;
				}
			});
		});
	}
}

module.exports = RuntimeChunkPlugin;