add warning on unsupported environment

in case of async/await check that environment support async functions

declarations/WebpackOptions.d.ts

@@ -2181,6 +2181,10 @@ export interface Environment {
 	 * The environment supports arrow functions ('() => { ... }').
 	 */
 	arrowFunction?: boolean;
+	/**
+	 * The environment supports async functions ('async () => { ... }').
+	 */
+	asyncFunction?: boolean;
 	/**
 	 * The environment supports BigInt as literal (123n).
 	 */

lib/ExternalModule.js

@@ -479,6 +479,7 @@ class ExternalModule extends Module {
 					}
 				} else {
 					this.buildMeta.async = true;
+					this.buildMeta.asyncReason = 'externalType="module"';
 					if (!Array.isArray(request) || request.length === 1) {
 						this.buildMeta.exportsType = "namespace";
 						canMangle = false;
@@ -488,9 +489,11 @@ class ExternalModule extends Module {
 			case "script":
 			case "promise":
 				this.buildMeta.async = true;
+				this.buildMeta.asyncReason = `externalType="${externalType}"`;
 				break;
 			case "import":
 				this.buildMeta.async = true;
+				this.buildMeta.asyncReason = 'externalType="import"';
 				if (!Array.isArray(request) || request.length === 1) {
 					this.buildMeta.exportsType = "namespace";
 					canMangle = false;

lib/Module.js

@@ -92,6 +92,7 @@ const makeSerializable = require("./util/makeSerializable");
  * @property {(false | "redirect" | "redirect-warn")=} defaultObject
  * @property {boolean=} strictHarmonyModule
  * @property {boolean=} async
+ * @property {string=} asyncReason
  * @property {boolean=} sideEffectFree
  */
 

lib/RuntimeTemplate.js

@@ -102,6 +102,10 @@ class RuntimeTemplate {
 		return this.outputOptions.environment.arrowFunction;
 	}
 
+	supportsAsyncFunction() {
+		return this.outputOptions.environment.asyncFunction;
+	}
+
 	supportsOptionalChaining() {
 		return this.outputOptions.environment.optionalChaining;
 	}

lib/async-modules/InferAsyncModulesPlugin.js

@@ -5,10 +5,13 @@
 
 "use strict";
 
+const WebpackError = require("../WebpackError");
 const HarmonyImportDependency = require("../dependencies/HarmonyImportDependency");
+const { contextify } = require("../util/identifier");
 
 /** @typedef {import("../Compiler")} Compiler */
 /** @typedef {import("../Module")} Module */
+/** @typedef {import("../NormalModule")} NormalModule */
 
 class InferAsyncModulesPlugin {
 	/**
@@ -18,6 +21,9 @@ class InferAsyncModulesPlugin {
 	 */
 	apply(compiler) {
 		compiler.hooks.compilation.tap("InferAsyncModulesPlugin", compilation => {
+			const asyncAwaitUnsupported =
+				compilation.runtimeTemplate.supportsAsyncFunction() === false;
+			const asyncReasons = [];
 			const { moduleGraph } = compilation;
 			compilation.hooks.finishModules.tap(
 				"InferAsyncModulesPlugin",
@@ -27,6 +33,15 @@ class InferAsyncModulesPlugin {
 					for (const module of modules) {
 						if (module.buildMeta && module.buildMeta.async) {
 							queue.add(module);
+							if (asyncAwaitUnsupported && "userRequest" in module) {
+								asyncReasons.push(
+									`- ${contextify(
+										compiler.context,
+										/** @type {NormalModule} */ (module).userRequest,
+										compiler
+									)} (${module.buildMeta.asyncReason || "unknown reason"})`
+								);
+							}
 						}
 					}
 					for (const module of queue) {
@@ -46,6 +61,16 @@ class InferAsyncModulesPlugin {
 							}
 						}
 					}
+
+					if (asyncReasons.length) {
+						const warning = new WebpackError(
+							"Output environment does not support async/await"
+						);
+						warning.details = `List of async modules:\n${asyncReasons.join(
+							"\n"
+						)}`;
+						compilation.warnings.push(warning);
+					}
 				}
 			);
 		});

lib/config/browserslistTargetHandler.js

@@ -170,6 +170,25 @@ const resolve = browsers => {
 			kaios: [2, 5],
 			node: [6, 0]
 		}),
+		asyncFunction: rawChecker({
+			chrome: 55,
+			and_chr: 55,
+			edge: 15,
+			firefox: 52,
+			and_ff: 52,
+			// ie: Not supported,
+			opera: 42,
+			op_mob: 42,
+			safari: 11,
+			ios_saf: 11,
+			samsung: [6, 0],
+			android: 55,
+			// and_qq: Not supported,
+			// baidu: Not supported,
+			and_uc: [12, 12],
+			// kaios: Not supported,
+			node: [7, 6]
+		}),
 		forOf: rawChecker({
 			chrome: 38,
 			and_chr: 38,

lib/config/defaults.js

@@ -921,6 +921,11 @@ const applyOutputDefaults = (
 		"arrowFunction",
 		() => tp && optimistic(tp.arrowFunction)
 	);
+	F(
+		output.environment,
+		"asyncFunction",
+		() => tp && optimistic(tp.asyncFunction)
+	);
 	F(output.environment, "const", () => tp && optimistic(tp.const));
 	F(
 		output.environment,

lib/config/target.js

@@ -54,6 +54,7 @@ const getDefaultTarget = context => {
  * @property {boolean | null} bigIntLiteral big int literal syntax is available
  * @property {boolean | null} const const and let variable declarations are available
  * @property {boolean | null} arrowFunction arrow functions are available
+ * @property {boolean | null} asyncFunction async functions are available
  * @property {boolean | null} forOf for of iteration is available
  * @property {boolean | null} destructuring destructuring is available
  * @property {boolean | null} dynamicImport async import() is available
@@ -172,6 +173,7 @@ You can also more options via the 'target' option: 'browserslist' / 'browserslis
 				templateLiteral: v(4),
 				optionalChaining: v(14),
 				arrowFunction: v(6),
+				asyncFunction: v(7, 6),
 				forOf: v(5),
 				destructuring: v(6),
 				bigIntLiteral: v(10, 4),
@@ -213,6 +215,7 @@ You can also more options via the 'target' option: 'browserslist' / 'browserslis
 				templateLiteral: v(1, 1),
 				optionalChaining: v(8),
 				arrowFunction: v(1, 1),
+				asyncFunction: v(1, 7),
 				forOf: v(0, 36),
 				destructuring: v(1, 1),
 				bigIntLiteral: v(4),
@@ -250,6 +253,7 @@ You can also more options via the 'target' option: 'browserslist' / 'browserslis
 				templateLiteral: v(0, 13),
 				optionalChaining: v(0, 44),
 				arrowFunction: v(0, 15),
+				asyncFunction: v(0, 19),
 				forOf: v(0, 13),
 				destructuring: v(0, 15),
 				bigIntLiteral: v(0, 32),
@@ -271,6 +275,7 @@ You can also more options via the 'target' option: 'browserslist' / 'browserslis
 				templateLiteral: v >= 2015,
 				optionalChaining: v >= 2020,
 				arrowFunction: v >= 2015,
+				asyncFunction: v >= 2017,
 				forOf: v >= 2015,
 				destructuring: v >= 2015,
 				module: v >= 2015,

lib/dependencies/HarmonyDetectionParserPlugin.js

@@ -61,6 +61,7 @@ module.exports = class HarmonyDetectionParserPlugin {
 				);
 			}
 			module.buildMeta.async = true;
+			module.buildMeta.asyncReason = "top-level-await";
 		});
 
 		const skipInHarmony = () => {

lib/wasm-async/AsyncWebAssemblyParser.js

@@ -43,6 +43,7 @@ class WebAssemblyParser extends Parser {
 		state.module.buildInfo.strict = true;
 		state.module.buildMeta.exportsType = "namespace";
 		state.module.buildMeta.async = true;
+		state.module.buildMeta.asyncReason = "async wasm";
 
 		// parse it
 		const program = decode(source, decoderOpts);

schemas/WebpackOptions.json

@@ -723,6 +723,10 @@
           "description": "The environment supports arrow functions ('() => { ... }').",
           "type": "boolean"
         },
+        "asyncFunction": {
+          "description": "The environment supports async functions ('async () => { ... }').",
+          "type": "boolean"
+        },
         "bigIntLiteral": {
           "description": "The environment supports BigInt as literal (123n).",
           "type": "boolean"

test/Defaults.unittest.js

@@ -323,6 +323,7 @@ describe("snapshots", () => {
 		    ],
 		    "environment": Object {
 		      "arrowFunction": true,
+		      "asyncFunction": true,
 		      "bigIntLiteral": undefined,
 		      "const": true,
 		      "destructuring": true,
@@ -1972,6 +1973,7 @@ describe("snapshots", () => {
 			+     "devtoolNamespace": "browserslist-test",
 			@@ ... @@
 			-       "arrowFunction": true,
+			-       "asyncFunction": true,
 			-       "bigIntLiteral": undefined,
 			-       "const": true,
 			-       "destructuring": true,
@@ -1979,6 +1981,7 @@ describe("snapshots", () => {
 			-       "forOf": true,
 			-       "module": undefined,
 			+       "arrowFunction": false,
+			+       "asyncFunction": false,
 			+       "bigIntLiteral": false,
 			+       "const": false,
 			+       "destructuring": false,

test/__snapshots__/Cli.basictest.js.snap

@@ -5551,6 +5551,19 @@ Object {
     "multiple": false,
     "simpleType": "boolean",
   },
+  "output-environment-async-function": Object {
+    "configs": Array [
+      Object {
+        "description": "The environment supports async functions ('async () => { ... }').",
+        "multiple": false,
+        "path": "output.environment.asyncFunction",
+        "type": "boolean",
+      },
+    ],
+    "description": "The environment supports async functions ('async () => { ... }').",
+    "multiple": false,
+    "simpleType": "boolean",
+  },
   "output-environment-big-int-literal": Object {
     "configs": Array [
       Object {

test/__snapshots__/StatsTestCases.basictest.js.snap

@@ -482,6 +482,22 @@ all:
   all (webpack x.x.x) compiled successfully"
 `;
 
+exports[`StatsTestCases should print correct stats for async-unsupported 1`] = `
+"asset main.js 7.6 KiB [emitted] (name: main)
+runtime modules 3.26 KiB 4 modules
+built modules 191 bytes [built]
+  ./index.js 106 bytes [built] [code generated]
+  external \\"Promise.resolve()\\" 42 bytes [built] [code generated]
+  ./a.js 43 bytes [built] [code generated]
+
+WARNING in Output environment does not support async/await
+List of async modules:
+- aaa (externalType=\\"promise\\")
+- ./a.js (top-level-await)
+
+webpack x.x.x compiled with 1 warning in X ms"
+`;
+
 exports[`StatsTestCases should print correct stats for child-compiler-apply-entry-option 1`] = `
 "asset child.js 84 bytes [emitted]
 asset parent.js 84 bytes [emitted] (name: parent)
@@ -4593,12 +4609,12 @@ exports[`StatsTestCases should print correct stats for wasm-explorer-examples-sy
   asset 517.bundle.js 243 bytes [emitted]
   asset 20.bundle.js 241 bytes [emitted]
 assets by path *.wasm 1.37 KiB
-  asset e3f145b183228cc640d7.module.wasm 531 bytes [emitted] [immutable]
+  asset d92334cc69c2ccd8b540.module.wasm 531 bytes [emitted] [immutable]
-  asset 82d524821ee70d495948.module.wasm 290 bytes [emitted] [immutable]
+  asset 645aa0483e52ace8e4fd.module.wasm 290 bytes [emitted] [immutable]
-  asset ea450800640f54975338.module.wasm 156 bytes [emitted] [immutable]
+  asset 46179256c558742d41d7.module.wasm 156 bytes [emitted] [immutable]
-  asset ebbf27083d239c1ad5e3.module.wasm 154 bytes [emitted] [immutable]
+  asset 1a7c48f2600cf2f47bc2.module.wasm 154 bytes [emitted] [immutable]
-  asset ee97efb6a05a4e504238.module.wasm 154 bytes [emitted] [immutable]
+  asset 71d4728d83eae16edec5.module.wasm 154 bytes [emitted] [immutable]
-  asset 0301cb3f9f4151b567f5.module.wasm 120 bytes [emitted] [immutable]
+  asset 35348d4020d7103dc072.module.wasm 120 bytes [emitted] [immutable]
 chunk (runtime: main) 20.bundle.js 50 bytes (javascript) 531 bytes (webassembly) [rendered]
   ./duff.wasm 50 bytes (javascript) 531 bytes (webassembly) [built] [code generated]
 chunk (runtime: main) bundle.js (main) 586 bytes (javascript) 9.49 KiB (runtime) [entry] [rendered]

test/__snapshots__/target-browserslist.unittest.js.snap

@@ -3,6 +3,7 @@
 exports[`browserslist target ["and_chr 80"] 1`] = `
 Object {
   "arrowFunction": true,
+  "asyncFunction": true,
   "bigIntLiteral": true,
   "browser": true,
   "const": true,
@@ -32,6 +33,7 @@ Object {
 exports[`browserslist target ["and_ff 68"] 1`] = `
 Object {
   "arrowFunction": true,
+  "asyncFunction": true,
   "bigIntLiteral": true,
   "browser": true,
   "const": true,
@@ -61,6 +63,7 @@ Object {
 exports[`browserslist target ["and_qq 10.4"] 1`] = `
 Object {
   "arrowFunction": true,
+  "asyncFunction": false,
   "bigIntLiteral": false,
   "browser": true,
   "const": true,
@@ -90,6 +93,7 @@ Object {
 exports[`browserslist target ["and_uc 12.12"] 1`] = `
 Object {
   "arrowFunction": true,
+  "asyncFunction": true,
   "bigIntLiteral": false,
   "browser": true,
   "const": true,
@@ -119,6 +123,7 @@ Object {
 exports[`browserslist target ["android 4"] 1`] = `
 Object {
   "arrowFunction": false,
+  "asyncFunction": false,
   "bigIntLiteral": false,
   "browser": true,
   "const": false,
@@ -148,6 +153,7 @@ Object {
 exports[`browserslist target ["android 4.1"] 1`] = `
 Object {
   "arrowFunction": false,
+  "asyncFunction": false,
   "bigIntLiteral": false,
   "browser": true,
   "const": false,
@@ -177,6 +183,7 @@ Object {
 exports[`browserslist target ["android 4.4.3-4.4.4"] 1`] = `
 Object {
   "arrowFunction": false,
+  "asyncFunction": false,
   "bigIntLiteral": false,
   "browser": true,
   "const": false,
@@ -206,6 +213,7 @@ Object {
 exports[`browserslist target ["android 81"] 1`] = `
 Object {
   "arrowFunction": true,
+  "asyncFunction": true,
   "bigIntLiteral": true,
   "browser": true,
   "const": true,
@@ -235,6 +243,7 @@ Object {
 exports[`browserslist target ["baidu 7.12"] 1`] = `
 Object {
   "arrowFunction": true,
+  "asyncFunction": false,
   "bigIntLiteral": false,
   "browser": true,
   "const": false,
@@ -264,6 +273,7 @@ Object {
 exports[`browserslist target ["bb 10"] 1`] = `
 Object {
   "arrowFunction": false,
+  "asyncFunction": false,
   "bigIntLiteral": false,
   "browser": true,
   "const": false,
@@ -293,6 +303,7 @@ Object {
 exports[`browserslist target ["chrome 80","node 12.19.0"] 1`] = `
 Object {
   "arrowFunction": true,
+  "asyncFunction": true,
   "bigIntLiteral": true,
   "browser": null,
   "const": true,
@@ -322,6 +333,7 @@ Object {
 exports[`browserslist target ["chrome 80"] 1`] = `
 Object {
   "arrowFunction": true,
+  "asyncFunction": true,
   "bigIntLiteral": true,
   "browser": true,
   "const": true,
@@ -351,6 +363,7 @@ Object {
 exports[`browserslist target ["edge 79"] 1`] = `
 Object {
   "arrowFunction": true,
+  "asyncFunction": true,
   "bigIntLiteral": true,
   "browser": true,
   "const": true,
@@ -380,6 +393,7 @@ Object {
 exports[`browserslist target ["firefox 68"] 1`] = `
 Object {
   "arrowFunction": true,
+  "asyncFunction": true,
   "bigIntLiteral": true,
   "browser": true,
   "const": true,
@@ -409,6 +423,7 @@ Object {
 exports[`browserslist target ["firefox 80","chrome 80"] 1`] = `
 Object {
   "arrowFunction": true,
+  "asyncFunction": true,
   "bigIntLiteral": true,
   "browser": true,
   "const": true,
@@ -438,6 +453,7 @@ Object {
 exports[`browserslist target ["ie 11"] 1`] = `
 Object {
   "arrowFunction": false,
+  "asyncFunction": false,
   "bigIntLiteral": false,
   "browser": true,
   "const": false,
@@ -467,6 +483,7 @@ Object {
 exports[`browserslist target ["ie_mob 11"] 1`] = `
 Object {
   "arrowFunction": false,
+  "asyncFunction": false,
   "bigIntLiteral": false,
   "browser": true,
   "const": false,
@@ -496,6 +513,7 @@ Object {
 exports[`browserslist target ["ios_saf 12.0-12.1"] 1`] = `
 Object {
   "arrowFunction": true,
+  "asyncFunction": true,
   "bigIntLiteral": false,
   "browser": true,
   "const": true,
@@ -525,6 +543,7 @@ Object {
 exports[`browserslist target ["kaios 2.5"] 1`] = `
 Object {
   "arrowFunction": true,
+  "asyncFunction": false,
   "bigIntLiteral": false,
   "browser": true,
   "const": true,
@@ -554,6 +573,7 @@ Object {
 exports[`browserslist target ["node 0.10.0"] 1`] = `
 Object {
   "arrowFunction": false,
+  "asyncFunction": false,
   "bigIntLiteral": false,
   "browser": false,
   "const": false,
@@ -583,6 +603,7 @@ Object {
 exports[`browserslist target ["node 0.12.0"] 1`] = `
 Object {
   "arrowFunction": false,
+  "asyncFunction": false,
   "bigIntLiteral": false,
   "browser": false,
   "const": false,
@@ -612,6 +633,7 @@ Object {
 exports[`browserslist target ["node 10.0.0"] 1`] = `
 Object {
   "arrowFunction": true,
+  "asyncFunction": true,
   "bigIntLiteral": false,
   "browser": false,
   "const": true,
@@ -641,6 +663,7 @@ Object {
 exports[`browserslist target ["node 10.17.0"] 1`] = `
 Object {
   "arrowFunction": true,
+  "asyncFunction": true,
   "bigIntLiteral": true,
   "browser": false,
   "const": true,
@@ -670,6 +693,7 @@ Object {
 exports[`browserslist target ["node 12.19.0"] 1`] = `
 Object {
   "arrowFunction": true,
+  "asyncFunction": true,
   "bigIntLiteral": true,
   "browser": false,
   "const": true,
@@ -699,6 +723,7 @@ Object {
 exports[`browserslist target ["op_mini all"] 1`] = `
 Object {
   "arrowFunction": false,
+  "asyncFunction": false,
   "bigIntLiteral": false,
   "browser": true,
   "const": false,
@@ -728,6 +753,7 @@ Object {
 exports[`browserslist target ["op_mob 54"] 1`] = `
 Object {
   "arrowFunction": true,
+  "asyncFunction": true,
   "bigIntLiteral": true,
   "browser": true,
   "const": true,
@@ -757,6 +783,7 @@ Object {
 exports[`browserslist target ["opera 54"] 1`] = `
 Object {
   "arrowFunction": true,
+  "asyncFunction": true,
   "bigIntLiteral": true,
   "browser": true,
   "const": true,
@@ -786,6 +813,7 @@ Object {
 exports[`browserslist target ["safari 10"] 1`] = `
 Object {
   "arrowFunction": true,
+  "asyncFunction": false,
   "bigIntLiteral": false,
   "browser": true,
   "const": false,
@@ -815,6 +843,7 @@ Object {
 exports[`browserslist target ["safari 11"] 1`] = `
 Object {
   "arrowFunction": true,
+  "asyncFunction": true,
   "bigIntLiteral": false,
   "browser": true,
   "const": true,
@@ -844,6 +873,7 @@ Object {
 exports[`browserslist target ["safari 12.0"] 1`] = `
 Object {
   "arrowFunction": true,
+  "asyncFunction": true,
   "bigIntLiteral": false,
   "browser": true,
   "const": true,
@@ -873,6 +903,7 @@ Object {
 exports[`browserslist target ["safari 12.1"] 1`] = `
 Object {
   "arrowFunction": true,
+  "asyncFunction": true,
   "bigIntLiteral": false,
   "browser": true,
   "const": true,
@@ -902,6 +933,7 @@ Object {
 exports[`browserslist target ["safari 13"] 1`] = `
 Object {
   "arrowFunction": true,
+  "asyncFunction": true,
   "bigIntLiteral": false,
   "browser": true,
   "const": true,
@@ -931,6 +963,7 @@ Object {
 exports[`browserslist target ["safari TP"] 1`] = `
 Object {
   "arrowFunction": true,
+  "asyncFunction": true,
   "bigIntLiteral": true,
   "browser": true,
   "const": true,
@@ -960,6 +993,7 @@ Object {
 exports[`browserslist target ["samsung 4"] 1`] = `
 Object {
   "arrowFunction": false,
+  "asyncFunction": false,
   "bigIntLiteral": false,
   "browser": true,
   "const": false,
@@ -989,6 +1023,7 @@ Object {
 exports[`browserslist target ["samsung 9.2"] 1`] = `
 Object {
   "arrowFunction": true,
+  "asyncFunction": true,
   "bigIntLiteral": true,
   "browser": true,
   "const": true,
@@ -1018,6 +1053,7 @@ Object {
 exports[`browserslist target ["samsung 11.1-11.2"] 1`] = `
 Object {
   "arrowFunction": true,
+  "asyncFunction": true,
   "bigIntLiteral": true,
   "browser": true,
   "const": true,
@@ -1047,6 +1083,7 @@ Object {
 exports[`browserslist target ["unknown 50"] 1`] = `
 Object {
   "arrowFunction": false,
+  "asyncFunction": false,
   "bigIntLiteral": false,
   "browser": true,
   "const": false,

test/configCases/ecmaVersion/browserslist-config-env/webpack.config.js

@@ -9,6 +9,7 @@ module.exports = {
 				expect(compilation.outputOptions.environment).toMatchInlineSnapshot(`
 			Object {
 			  "arrowFunction": false,
+			  "asyncFunction": false,
 			  "bigIntLiteral": false,
 			  "const": false,
 			  "destructuring": false,

test/configCases/ecmaVersion/browserslist-config/webpack.config.js

@@ -9,6 +9,7 @@ module.exports = {
 				expect(compilation.outputOptions.environment).toMatchInlineSnapshot(`
 			Object {
 			  "arrowFunction": false,
+			  "asyncFunction": false,
 			  "bigIntLiteral": false,
 			  "const": false,
 			  "destructuring": false,

test/configCases/ecmaVersion/browserslist-query/webpack.config.js

@@ -7,6 +7,7 @@ module.exports = {
 				expect(compilation.outputOptions.environment).toMatchInlineSnapshot(`
 			Object {
 			  "arrowFunction": false,
+			  "asyncFunction": false,
 			  "bigIntLiteral": false,
 			  "const": false,
 			  "destructuring": false,

test/configCases/ecmaVersion/browserslist/webpack.config.js

@@ -7,6 +7,7 @@ module.exports = {
 				expect(compilation.outputOptions.environment).toMatchInlineSnapshot(`
 			Object {
 			  "arrowFunction": true,
+			  "asyncFunction": true,
 			  "bigIntLiteral": true,
 			  "const": true,
 			  "destructuring": true,

test/statsCases/async-unsupported/a.js

@@ -0,0 +1,2 @@
+await Promise.resolve();
+export default 1;

test/statsCases/async-unsupported/index.js

@@ -0,0 +1,6 @@
+import aaa from "aaa";
+import a from "./a";
+
+it("should compile and run", () => {
+	expect(a).toBe(1);
+});

test/statsCases/async-unsupported/webpack.config.js

@@ -0,0 +1,16 @@
+/** @type {import("../../../").Configuration} */
+module.exports = {
+	mode: "production",
+	target: ["web", "es5"],
+	entry: "./index",
+	experiments: {
+		topLevelAwait: true
+	},
+	externals: {
+		aaa: "promise Promise.resolve()"
+	},
+	stats: {
+		preset: "all",
+		errorDetails: true
+	}
+};

types.d.ts

@@ -3346,6 +3346,11 @@ declare interface Environment {
 	 */
 	arrowFunction?: boolean;
 
+	/**
+	 * The environment supports async functions ('async () => { ... }').
+	 */
+	asyncFunction?: boolean;
+
 	/**
 	 * The environment supports BigInt as literal (123n).
 	 */
@@ -5724,6 +5729,7 @@ declare interface KnownBuildMeta {
 	defaultObject?: false | "redirect" | "redirect-warn";
 	strictHarmonyModule?: boolean;
 	async?: boolean;
+	asyncReason?: string;
 	sideEffectFree?: boolean;
 }
 declare interface KnownCreateStatsOptionsContext {
@@ -10301,6 +10307,7 @@ declare abstract class RuntimeTemplate {
 	isModule(): undefined | boolean;
 	supportsConst(): undefined | boolean;
 	supportsArrowFunction(): undefined | boolean;
+	supportsAsyncFunction(): undefined | boolean;
 	supportsOptionalChaining(): undefined | boolean;
 	supportsForOf(): undefined | boolean;
 	supportsDestructuring(): undefined | boolean;