Add global helper

example.html

@@ -1,13 +1,10 @@
 <script src="runtime-checker.js"></script>
 <script>
-	function sum(a_number, b_number) {
+	const sum = typedFunction((a_number, b_number) => {
 		return a + b;
-	}
+	});
 
-	// I need to get rid of this
-	sum = sum.addRuntimeChecker();
-
-	var result = sum(1, 2);
+	const result = sum(1, 2);
 	console.log(result); // 3
 
 	sum("1", 2); // Error

runtime-checker.js

@@ -1,7 +1,6 @@
 Function.prototype.addRuntimeChecker = function() {
 	var handler = {
 		apply: function(target, thisArg, argumentValues) {
-			
 			// https://stackoverflow.com/a/31194949
 			var argumentNames = target.toString()
 				.replace(/[/][/].*$/mg,'') // strip single-line comments
@@ -56,3 +55,7 @@ Function.prototype.addRuntimeChecker = function() {
 	return new Proxy(this, handler);
 }
 
+window.typedFunction = function(func) {
+	return func.addRuntimeChecker();
+}
+