[Refactor] skip getProto call when AsyncFunction does not exist

ljharb · ljharb · commit dc929a547a5f · 2025-01-22T10:35:20.000-08:00
diff --git a/index.js b/index.js
@@ -43,5 +43,5 @@ module.exports = function isAsyncFunction(fn) {
 		// eslint-disable-next-line no-extra-parens
 		AsyncFunction = asyncFunc ? /** @type {import('.').AsyncFunction} */ (getProto(asyncFunc)) : false;
 	}
-	return getProto(fn) === AsyncFunction;
+	return AsyncFunction && getProto(fn) === AsyncFunction;
 };

Original file line number	Diff line number	Diff line change
`@@ -43,5 +43,5 @@ module.exports = function isAsyncFunction(fn) {`
`43`	`43`	`// eslint-disable-next-line no-extra-parens`
`44`	`44`	`AsyncFunction = asyncFunc ? /** @type {import('.').AsyncFunction} */ (getProto(asyncFunc)) : false;`
`45`	`45`	`}`
`46`		`- return getProto(fn) === AsyncFunction;`
	`46`	`+ return AsyncFunction && getProto(fn) === AsyncFunction;`
`47`	`47`	`};`