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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.
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/*
	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
} = require("../ModuleTypeConstants");
const RuntimeGlobals = require("../RuntimeGlobals");
const WebpackError = require("../WebpackError");
const {
	evaluateToString,
	expressionIsUnsupported,
	toConstantDependency
} = require("../javascript/JavascriptParserHelpers");
const makeSerializable = require("../util/makeSerializable");
const ConstDependency = require("./ConstDependency");
const SystemRuntimeModule = require("./SystemRuntimeModule");

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

const PLUGIN_NAME = "SystemPlugin";

class SystemPlugin {
	/**
	 * Apply the plugin
	 * @param {Compiler} compiler the compiler instance
	 * @returns {void}
	 */
	apply(compiler) {
		compiler.hooks.compilation.tap(
			PLUGIN_NAME,
			(compilation, { normalModuleFactory }) => {
				compilation.hooks.runtimeRequirementInModule
					.for(RuntimeGlobals.system)
					.tap(PLUGIN_NAME, (module, set) => {
						set.add(RuntimeGlobals.requireScope);
					});

				compilation.hooks.runtimeRequirementInTree
					.for(RuntimeGlobals.system)
					.tap(PLUGIN_NAME, (chunk, set) => {
						compilation.addRuntimeModule(chunk, new SystemRuntimeModule());
					});

				/**
				 * @param {Parser} parser parser parser
				 * @param {JavascriptParserOptions} parserOptions parserOptions
				 * @returns {void}
				 */
				const handler = (parser, parserOptions) => {
					if (parserOptions.system === undefined || !parserOptions.system) {
						return;
					}

					/**
					 * @param {string} name name
					 */
					const setNotSupported = name => {
						parser.hooks.evaluateTypeof
							.for(name)
							.tap(PLUGIN_NAME, evaluateToString("undefined"));
						parser.hooks.expression
							.for(name)
							.tap(
								PLUGIN_NAME,
								expressionIsUnsupported(
									parser,
									name + " is not supported by webpack."
								)
							);
					};

					parser.hooks.typeof
						.for("System.import")
						.tap(
							PLUGIN_NAME,
							toConstantDependency(parser, JSON.stringify("function"))
						);
					parser.hooks.evaluateTypeof
						.for("System.import")
						.tap(PLUGIN_NAME, evaluateToString("function"));
					parser.hooks.typeof
						.for("System")
						.tap(
							PLUGIN_NAME,
							toConstantDependency(parser, JSON.stringify("object"))
						);
					parser.hooks.evaluateTypeof
						.for("System")
						.tap(PLUGIN_NAME, evaluateToString("object"));

					setNotSupported("System.set");
					setNotSupported("System.get");
					setNotSupported("System.register");

					parser.hooks.expression.for("System").tap(PLUGIN_NAME, expr => {
						const dep = new ConstDependency(
							RuntimeGlobals.system,
							/** @type {Range} */ (expr.range),
							[RuntimeGlobals.system]
						);
						dep.loc = /** @type {DependencyLocation} */ (expr.loc);
						parser.state.module.addPresentationalDependency(dep);
						return true;
					});

					parser.hooks.call.for("System.import").tap(PLUGIN_NAME, expr => {
						parser.state.module.addWarning(
							new SystemImportDeprecationWarning(
								/** @type {DependencyLocation} */ (expr.loc)
							)
						);

						return parser.hooks.importCall.call({
							type: "ImportExpression",
							source:
								/** @type {import("estree").Literal} */
								(expr.arguments[0]),
							loc: expr.loc,
							range: expr.range
						});
					});
				};

				normalModuleFactory.hooks.parser
					.for(JAVASCRIPT_MODULE_TYPE_AUTO)
					.tap(PLUGIN_NAME, handler);
				normalModuleFactory.hooks.parser
					.for(JAVASCRIPT_MODULE_TYPE_DYNAMIC)
					.tap(PLUGIN_NAME, handler);
			}
		);
	}
}

class SystemImportDeprecationWarning extends WebpackError {
	/**
	 * @param {DependencyLocation} loc location
	 */
	constructor(loc) {
		super(
			"System.import() is deprecated and will be removed soon. Use import() instead.\n" +
				"For more info visit https://webpack.js.org/guides/code-splitting/"
		);

		this.name = "SystemImportDeprecationWarning";

		this.loc = loc;
	}
}

makeSerializable(
	SystemImportDeprecationWarning,
	"webpack/lib/dependencies/SystemPlugin",
	"SystemImportDeprecationWarning"
);

module.exports = SystemPlugin;
module.exports.SystemImportDeprecationWarning = SystemImportDeprecationWarning;