webpack/lib/runtime/CreateScriptUrlRuntimeModule.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
*/

"use strict";

const RuntimeGlobals = require("../RuntimeGlobals");
const Template = require("../Template");
const HelperRuntimeModule = require("./HelperRuntimeModule");

class CreateScriptUrlRuntimeModule extends HelperRuntimeModule {
	constructor() {
		super("trusted types");
	}

	/**
	 * @returns {string} runtime code
	 */
	generate() {
		const { compilation } = this;
		const { runtimeTemplate, outputOptions } = compilation;
		const { trustedTypes } = outputOptions;
		const fn = RuntimeGlobals.createScriptUrl;

		if (!trustedTypes) {
			// Skip Trusted Types logic.
			return Template.asString([
				`${fn} = ${runtimeTemplate.returningFunction("url", "url")};`
			]);
		}

		return Template.asString([
			"var policy;",
			`${fn} = ${runtimeTemplate.basicFunction("url", [
				"// Create Trusted Type policy if Trusted Types are available and the policy doesn't exist yet.",
				"if (policy === undefined) {",
				Template.indent([
					"policy = {",
					Template.indent([
						`createScriptURL: ${runtimeTemplate.returningFunction(
							"url",
							"url"
						)}`
					]),
					"};",
					'if (typeof trustedTypes !== "undefined" && trustedTypes.createPolicy) {',
					Template.indent([
						`policy = trustedTypes.createPolicy(${JSON.stringify(
							trustedTypes.policyName
						)}, policy);`
					]),
					"}"
				]),
				"}",
				"return policy.createScriptURL(url);"
			])};`
		]);
	}
}

module.exports = CreateScriptUrlRuntimeModule;