util: support AsyncGeneratorFunction in .inspect

This makes sure async generator functions are properly detected while
using `util.inspect`.

PR-URL: nodejs#28056
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Michaël Zasso <targos@protonmail.com>
Reviewed-By: Yongsheng Zhang <zyszys98@gmail.com>
Reviewed-By: Benjamin Gruenbaum <benjamingr@gmail.com>
Reviewed-By: Tiancheng "Timothy" Gu <timothygu99@gmail.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Trivikram Kamat <trivikr.dev@gmail.com>
Reviewed-By: Rich Trott <rtrott@gmail.com>

lib/internal/util/inspect.js

@@ -870,10 +870,11 @@ function getBoxedBase(value, ctx, keys, constructor, tag) {
 
 function getFunctionBase(value, constructor, tag) {
   let type = 'Function';
+  if (isGeneratorFunction(value)) {
+    type = `Generator${type}`;
+  }
   if (isAsyncFunction(value)) {
-    type = 'AsyncFunction';
-  } else if (isGeneratorFunction(value)) {
-    type = 'GeneratorFunction';
+    type = `Async${type}`;
   }
   let base = `[${type}`;
   if (constructor === null) {

test/parallel/test-util-inspect.js

@@ -48,6 +48,10 @@ assert.strictEqual(util.inspect(async () => {}), '[AsyncFunction (anonymous)]');
     util.inspect(fn),
     '[GeneratorFunction (anonymous)]'
   );
+  assert.strictEqual(
+    util.inspect(async function* abc() {}),
+    '[AsyncGeneratorFunction: abc]'
+  );
   Object.setPrototypeOf(fn, Object.getPrototypeOf(async () => {}));
   assert.strictEqual(
     util.inspect(fn),