webpack/lib/runtime/DefinePropertyGettersRuntimeModule.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 DefinePropertyGettersRuntimeModule extends HelperRuntimeModule {
	constructor() {
		super("define property getters");
	}

	/**
	 * @returns {string} runtime code
	 */
	generate() {
		const { runtimeTemplate } = this.compilation;
		const fn = RuntimeGlobals.definePropertyGetters;
		return Template.asString([
			"// define getter functions for harmony exports",
			`${fn} = ${runtimeTemplate.basicFunction("exports, definition", [
				`for(var key in definition) {`,
				Template.indent([
					`if(${RuntimeGlobals.hasOwnProperty}(definition, key) && !${RuntimeGlobals.hasOwnProperty}(exports, key)) {`,
					Template.indent([
						"Object.defineProperty(exports, key, { enumerable: true, get: definition[key] });"
					]),
					"}"
				]),
				"}"
			])};`
		]);
	}
}

module.exports = DefinePropertyGettersRuntimeModule;