webpack/lib/runtime/GetMainFilenameRuntimeModule.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");
const Template = require("../Template");

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

class GetMainFilenameRuntimeModule extends RuntimeModule {
	/**
	 * @param {string} name readable name
	 * @param {string} global global object binding
	 * @param {string} filename main file name
	 */
	constructor(name, global, filename) {
		super(`get ${name} filename`);
		this.global = global;
		this.filename = filename;
	}

	/**
	 * @returns {string | null} runtime code
	 */
	generate() {
		const { global, filename } = this;
		const compilation = /** @type {Compilation} */ (this.compilation);
		const chunk = /** @type {Chunk} */ (this.chunk);
		const { runtimeTemplate } = compilation;
		const url = compilation.getPath(JSON.stringify(filename), {
			hash: `" + ${RuntimeGlobals.getFullHash}() + "`,
			hashWithLength: length =>
				`" + ${RuntimeGlobals.getFullHash}().slice(0, ${length}) + "`,
			chunk,
			runtime: chunk.runtime
		});
		return Template.asString([
			`${global} = ${runtimeTemplate.returningFunction(url)};`
		]);
	}
}

module.exports = GetMainFilenameRuntimeModule;