webpack/lib/WebpackIsIncludedPlugin.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 Ivan Kopeykin @vankop
*/

"use strict";

const IgnoreErrorModuleFactory = require("./IgnoreErrorModuleFactory");
const WebpackIsIncludedDependency = require("./dependencies/WebpackIsIncludedDependency");
const {
	toConstantDependency
} = require("./javascript/JavascriptParserHelpers");

/** @typedef {import("enhanced-resolve/lib/Resolver")} Resolver */
/** @typedef {import("./Compiler")} Compiler */
/** @typedef {import("./Module")} Module */
/** @typedef {import("./javascript/JavascriptParser")} JavascriptParser */

class WebpackIsIncludedPlugin {
	/**
	 * @param {Compiler} compiler the compiler instance
	 * @returns {void}
	 */
	apply(compiler) {
		compiler.hooks.compilation.tap(
			"WebpackIsIncludedPlugin",
			(compilation, { normalModuleFactory }) => {
				compilation.dependencyFactories.set(
					WebpackIsIncludedDependency,
					new IgnoreErrorModuleFactory(normalModuleFactory)
				);
				compilation.dependencyTemplates.set(
					WebpackIsIncludedDependency,
					new WebpackIsIncludedDependency.Template()
				);

				/**
				 * @param {JavascriptParser} parser the parser
				 * @returns {void}
				 */
				const handler = parser => {
					parser.hooks.call
						.for("__webpack_is_included__")
						.tap("WebpackIsIncludedPlugin", expr => {
							if (
								expr.type !== "CallExpression" ||
								expr.arguments.length !== 1 ||
								expr.arguments[0].type === "SpreadElement"
							)
								return;

							const request = parser.evaluateExpression(expr.arguments[0]);

							if (!request.isString()) return;

							const dep = new WebpackIsIncludedDependency(
								request.string,
								expr.range
							);
							dep.loc = expr.loc;
							parser.state.module.addDependency(dep);
							return true;
						});
					parser.hooks.typeof
						.for("__webpack_is_included__")
						.tap(
							"WebpackIsIncludedPlugin",
							toConstantDependency(parser, JSON.stringify("function"))
						);
				};
				normalModuleFactory.hooks.parser
					.for("javascript/auto")
					.tap("WebpackIsIncludedPlugin", handler);
				normalModuleFactory.hooks.parser
					.for("javascript/dynamic")
					.tap("WebpackIsIncludedPlugin", handler);
				normalModuleFactory.hooks.parser
					.for("javascript/esm")
					.tap("WebpackIsIncludedPlugin", handler);
			}
		);
	}
}

module.exports = WebpackIsIncludedPlugin;