Consider functions "equal" if type, name, arity, and body are equal.

index.js

@@ -79,7 +79,14 @@ module.exports = function isEqual(value, other) {
 		var otherIsArrow = isArrowFunction(other);
 		if (valueIsArrow !== otherIsArrow) { return false; }
 
-		return isEqual(String(value), String(other));
+		var valueStr = String(value);
+		var otherStr = String(other);
+		if (isEqual(valueStr, otherStr)) { return true; }
+
+		if (!valueIsGen && !valueIsArrow) {
+			return isEqual(valueStr.replace(/\)\s*\{/, '){'), otherStr.replace(/\)\s*\{/, '){'));
+		}
+		return isEqual(valueStr, otherStr);;
 	}
 
 	if (type === objType) {

test.js

@@ -128,6 +128,9 @@ test('functions', function (t) {
 	/* jscs: disable */
 	var fnNoSpace = function(){};
 	/* jscs: enable */
+	var fnWithSpaceBeforeBody = function () {};
+	var emptyFnWithName = function a() {};
+	var emptyFnOneArg = function (a) {};
 
 	/* for code coverage */
 	f1();
@@ -149,6 +152,10 @@ test('functions', function (t) {
 	t.notOk(isEqual(f1, f3), 'functions with same names but different implementations are not equal');
 	t.ok(isEqual(anon1, anon2), 'anon functions with same implementations are equal');
 
+	t.ok(isEqual(fnNoSpace, fnWithSpaceBeforeBody), 'functions with same arity/name/body are equal despite whitespace between signature and body');
+	t.notOk(isEqual(emptyFnWithName, fnNoSpace), 'functions with same arity/body, diff name, are not equal');
+	t.notOk(isEqual(emptyFnOneArg, fnNoSpace), 'functions with same name/body, diff arity, are not equal');
+
 	t.test('generators', { skip: !hasGeneratorSupport }, function (st) {
 		var genFnStar = Function('return function* () {};')();
 		var genFnSpaceStar = Function('return function *() {};')();