InferAsyncModulesPlugin.js
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	/*
	MIT License http://www.opensource.org/licenses/mit-license.php
	Author Tobias Koppers @sokra
	*/

	"use strict";

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

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

	class InferAsyncModulesPlugin {
	/**
	* Apply the plugin
	* @param {Compiler} compiler the compiler instance
	* @returns {void}
	*/
	apply(compiler) {
	compiler.hooks.compilation.tap("InferAsyncModulesPlugin", compilation => {
	const { moduleGraph } = compilation;
	compilation.hooks.finishModules.tap(
	"InferAsyncModulesPlugin",
	modules => {
	/** @type {Set<Module>} */
	const queue = new Set();
	for (const module of modules) {
	if (module.buildMeta && module.buildMeta.async) {
	queue.add(module);
	}
	}
	for (const module of queue) {
	moduleGraph.setAsync(module);
	const connections = moduleGraph.getIncomingConnections(module);
	for (const connection of connections) {
	const dep = connection.dependency;
	if (
	dep instanceof HarmonyImportDependency &&
	connection.isTargetActive(undefined)
	) {
	queue.add(connection.originModule);
	}
	}
	}
	}
	);
	});
	}
	}

	module.exports = InferAsyncModulesPlugin;