webpack/lib/dependencies/HarmonyTopLevelThisParserPlugin.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 Florent Cailhol @ooflorent
*/

"use strict";

const ConstDependency = require("./ConstDependency");
const HarmonyExports = require("./HarmonyExports");

/** @typedef {import("../Dependency").DependencyLocation} DependencyLocation */
/** @typedef {import("../javascript/JavascriptParser")} JavascriptParser */
/** @typedef {import("../javascript/JavascriptParser").Range} Range */

const PLUGIN_NAME = "HarmonyTopLevelThisParserPlugin";

class HarmonyTopLevelThisParserPlugin {
	/**
	 * @param {JavascriptParser} parser the parser
	 * @returns {void}
	 */
	apply(parser) {
		parser.hooks.expression.for("this").tap(PLUGIN_NAME, node => {
			if (!parser.scope.topLevelScope) return;
			if (HarmonyExports.isEnabled(parser.state)) {
				const dep = new ConstDependency(
					"undefined",
					/** @type {Range} */ (node.range),
					null
				);
				dep.loc = /** @type {DependencyLocation} */ (node.loc);
				parser.state.module.addPresentationalDependency(dep);
				return true;
			}
		});
	}
}

module.exports = HarmonyTopLevelThisParserPlugin;