source: frontend/node_modules/webpack/lib/async-modules/AsyncModuleHelpers.js

/*
        MIT License http://www.opensource.org/licenses/mit-license.php
        Author Haijie Xie @hai-x
*/

"use strict";

const HarmonyImportDependency = require("../dependencies/HarmonyImportDependency");

/** @typedef {import("../ModuleGraph")} ModuleGraph */
/** @typedef {import("../Module")} Module */

/** @typedef {Set<Module>} Modules */

/**
 * Gets outgoing async modules.
 * @param {ModuleGraph} moduleGraph module graph
 * @param {Module} module module
 * @returns {Modules} set of modules
 */
const getOutgoingAsyncModules = (moduleGraph, module) => {
        /** @type {Modules} */
        const set = new Set();
        /** @type {Modules} */
        const seen = new Set();
        (function g(module) {
                if (!moduleGraph.isAsync(module) || seen.has(module)) return;
                seen.add(module);
                if (module.buildMeta && module.buildMeta.async) {
                        set.add(module);
                } else {
                        const outgoingConnectionMap =
                                moduleGraph.getOutgoingConnectionsByModule(module);
                        if (outgoingConnectionMap) {
                                for (const [module, connections] of outgoingConnectionMap) {
                                        if (
                                                connections.some(
                                                        (c) =>
                                                                c.dependency instanceof HarmonyImportDependency &&
                                                                c.isTargetActive(undefined)
                                                ) &&
                                                module
                                        ) {
                                                g(module);
                                        }
                                }
                        }
                }
        })(module);
        return set;
};

module.exports.getOutgoingAsyncModules = getOutgoingAsyncModules;