webpack/lib/runtime/RuntimeIdRuntimeModule.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
*/

"use strict";

const RuntimeGlobals = require("../RuntimeGlobals");
const RuntimeModule = require("../RuntimeModule");

/** @typedef {import("../Chunk")} Chunk */
/** @typedef {import("../ChunkGraph")} ChunkGraph */

class RuntimeIdRuntimeModule extends RuntimeModule {
	constructor() {
		super("runtimeId");
	}

	/**
	 * @returns {string | null} runtime code
	 */
	generate() {
		const chunkGraph = /** @type {ChunkGraph} */ (this.chunkGraph);
		const chunk = /** @type {Chunk} */ (this.chunk);
		const runtime = chunk.runtime;
		if (typeof runtime !== "string")
			throw new Error("RuntimeIdRuntimeModule must be in a single runtime");
		const id = chunkGraph.getRuntimeId(runtime);
		return `${RuntimeGlobals.runtimeId} = ${JSON.stringify(id)};`;
	}
}

module.exports = RuntimeIdRuntimeModule;