webpack/lib/ExportsInfoApiPlugin.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 Tobias Koppers @sokra
*/

"use strict";

const {
	JAVASCRIPT_MODULE_TYPE_AUTO,
	JAVASCRIPT_MODULE_TYPE_DYNAMIC,
	JAVASCRIPT_MODULE_TYPE_ESM
} = require("./ModuleTypeConstants");
const ConstDependency = require("./dependencies/ConstDependency");
const ExportsInfoDependency = require("./dependencies/ExportsInfoDependency");

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

const PLUGIN_NAME = "ExportsInfoApiPlugin";

class ExportsInfoApiPlugin {
	/**
	 * Applies the plugin by registering its hooks on the compiler.
	 * @param {Compiler} compiler the compiler instance
	 * @returns {void}
	 */
	apply(compiler) {
		compiler.hooks.compilation.tap(
			PLUGIN_NAME,
			(compilation, { normalModuleFactory }) => {
				compilation.dependencyTemplates.set(
					ExportsInfoDependency,
					new ExportsInfoDependency.Template()
				);
				/**
				 * Handles the hook callback for this code path.
				 * @param {JavascriptParser} parser the parser
				 * @returns {void}
				 */
				const handler = (parser) => {
					parser.hooks.expressionMemberChain
						.for("__webpack_exports_info__")
						.tap(PLUGIN_NAME, (expr, members) => {
							const dep =
								members.length >= 2
									? new ExportsInfoDependency(
											/** @type {Range} */ (expr.range),
											members.slice(0, -1),
											members[members.length - 1]
										)
									: new ExportsInfoDependency(
											/** @type {Range} */ (expr.range),
											null,
											members[0]
										);
							dep.loc = /** @type {DependencyLocation} */ (expr.loc);
							parser.state.module.addDependency(dep);
							return true;
						});
					parser.hooks.expression
						.for("__webpack_exports_info__")
						.tap(PLUGIN_NAME, (expr) => {
							const dep = new ConstDependency(
								"true",
								/** @type {Range} */ (expr.range)
							);
							dep.loc = /** @type {DependencyLocation} */ (expr.loc);
							parser.state.module.addPresentationalDependency(dep);
							return true;
						});
				};
				normalModuleFactory.hooks.parser
					.for(JAVASCRIPT_MODULE_TYPE_AUTO)
					.tap(PLUGIN_NAME, handler);
				normalModuleFactory.hooks.parser
					.for(JAVASCRIPT_MODULE_TYPE_DYNAMIC)
					.tap(PLUGIN_NAME, handler);
				normalModuleFactory.hooks.parser
					.for(JAVASCRIPT_MODULE_TYPE_ESM)
					.tap(PLUGIN_NAME, handler);
			}
		);
	}
}

module.exports = ExportsInfoApiPlugin;