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

"use strict";

const ConstDependency = require("./dependencies/ConstDependency");
const ExportsInfoDependency = require("./dependencies/ExportsInfoDependency");

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

class ExportsInfoApiPlugin {
	/**
	 * Apply the plugin
	 * @param {Compiler} compiler the compiler instance
	 * @returns {void}
	 */
	apply(compiler) {
		compiler.hooks.compilation.tap(
			"ExportsInfoApiPlugin",
			(compilation, { normalModuleFactory }) => {
				compilation.dependencyTemplates.set(
					ExportsInfoDependency,
					new ExportsInfoDependency.Template()
				);
				/**
				 * @param {JavascriptParser} parser the parser
				 * @returns {void}
				 */
				const handler = parser => {
					parser.hooks.expressionMemberChain
						.for("__webpack_exports_info__")
						.tap("ExportsInfoApiPlugin", (expr, members) => {
							const dep =
								members.length >= 2
									? new ExportsInfoDependency(
											expr.range,
											members.slice(0, -1),
											members[members.length - 1]
									  )
									: new ExportsInfoDependency(expr.range, null, members[0]);
							dep.loc = expr.loc;
							parser.state.module.addDependency(dep);
							return true;
						});
					parser.hooks.expression
						.for("__webpack_exports_info__")
						.tap("ExportsInfoApiPlugin", expr => {
							const dep = new ConstDependency("true", expr.range);
							dep.loc = expr.loc;
							parser.state.module.addPresentationalDependency(dep);
							return true;
						});
				};
				normalModuleFactory.hooks.parser
					.for("javascript/auto")
					.tap("ExportsInfoApiPlugin", handler);
				normalModuleFactory.hooks.parser
					.for("javascript/dynamic")
					.tap("ExportsInfoApiPlugin", handler);
				normalModuleFactory.hooks.parser
					.for("javascript/esm")
					.tap("ExportsInfoApiPlugin", handler);
			}
		);
	}
}

module.exports = ExportsInfoApiPlugin;