fix: Ensure Function.isFunction recognizes async functions

medikoo · Aug 30, 2019 · 6f06e66 · 6f06e66
1 parent dd6fc3f
commit 6f06e66
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Showing 2 changed files with 8 additions and 2 deletions.
diff --git a/function/is-function.js b/function/is-function.js
@@ -1,8 +1,8 @@
 "use strict";
 
 var objToString = Object.prototype.toString
-  , id          = objToString.call(require("./noop"));
+  , isFunctionStringTag = RegExp.prototype.test.bind(/^[object [A-Za-z0-9]*Function]$/);
 
 module.exports = function (value) {
-	return typeof value === "function" && objToString.call(value) === id;
+	return typeof value === "function" && isFunctionStringTag(objToString.call(value));
 };
diff --git a/test/function/is-function.js b/test/function/is-function.js
@@ -5,4 +5,10 @@ var o = { call: Function.prototype.call, apply: Function.prototype.apply };
 module.exports = function (t, a) {
 	a(t(function () {}), true, "Function is function");
 	a(t(o), false, "Plain object is not function");
+	var asyncFunction;
+	try { asyncFunction = eval("async () => {}"); }
+	catch (error) {}
+	if (asyncFunction) {
+		a(t(asyncFunction), true, "Async function is function");
+	}
 };