source: frontend/node_modules/webpack/lib/dependencies/SystemPlugin.js

/*
        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("../errors/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 {
        /**
         * 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.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());
                                        });

                                /**
                                 * Handles the hook callback for this code path.
                                 * @param {Parser} parser parser parser
                                 * @param {JavascriptParserOptions} parserOptions parserOptions
                                 * @returns {void}
                                 */
                                const handler = (parser, parserOptions) => {
                                        if (parserOptions.system === undefined || !parserOptions.system) {
                                                return;
                                        }

                                        /**
                                         * Sets not supported.
                                         * @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,
                                                        options: null
                                                });
                                        });
                                };

                                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 {
        /**
         * Creates an instance of SystemImportDeprecationWarning.
         * @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;