1 files changed, 52 insertions, 0 deletions
diff --git a/node_modules/webpack/lib/EnvironmentNotSupportAsyncWarning.js b/node_modules/webpack/lib/EnvironmentNotSupportAsyncWarning.js
new file mode 100644
index 00000000..1a1ea9ec
--- /dev/null
+++ b/node_modules/webpack/lib/EnvironmentNotSupportAsyncWarning.js
@@ -0,0 +1,52 @@
+/*
+	MIT License http://www.opensource.org/licenses/mit-license.php
+	Author Gengkun He @ahabhgk
+*/
+
+"use strict";
+
+const WebpackError = require("./WebpackError");
+const makeSerializable = require("./util/makeSerializable");
+
+/** @typedef {import("./Module")} Module */
+/** @typedef {import("./Compilation")} Compilation */
+/** @typedef {import("./RuntimeTemplate")} RuntimeTemplate */
+/** @typedef {import("./serialization/ObjectMiddleware").ObjectDeserializerContext} ObjectDeserializerContext */
+/** @typedef {import("./serialization/ObjectMiddleware").ObjectSerializerContext} ObjectSerializerContext */
+/** @typedef {"asyncWebAssembly" | "topLevelAwait" | "external promise" | "external script" | "external import" | "external module"} Feature */
+
+class EnvironmentNotSupportAsyncWarning extends WebpackError {
+	/**
+	 * Creates an instance of EnvironmentNotSupportAsyncWarning.
+	 * @param {Module} module module
+	 * @param {Feature} feature feature
+	 */
+	constructor(module, feature) {
+		const message = `The generated code contains 'async/await' because this module is using "${feature}".
+However, your target environment does not appear to support 'async/await'.
+As a result, the code may not run as expected or may cause runtime errors.`;
+		super(message);
+
+		this.name = "EnvironmentNotSupportAsyncWarning";
+		this.module = module;
+	}
+
+	/**
+	 * Creates an instance of EnvironmentNotSupportAsyncWarning.
+	 * @param {Module} module module
+	 * @param {RuntimeTemplate} runtimeTemplate compilation
+	 * @param {Feature} feature feature
+	 */
+	static check(module, runtimeTemplate, feature) {
+		if (!runtimeTemplate.supportsAsyncFunction()) {
+			module.addWarning(new EnvironmentNotSupportAsyncWarning(module, feature));
+		}
+	}
+}
+
+makeSerializable(
+	EnvironmentNotSupportAsyncWarning,
+	"webpack/lib/EnvironmentNotSupportAsyncWarning"
+);
+
+module.exports = EnvironmentNotSupportAsyncWarning;