From 66b64e254d077668c095cd98a47a7b4b929b23e2 Mon Sep 17 00:00:00 2001
From: Rich Harris <richard.a.harris@gmail.com>
Date: Thu, 18 Jan 2018 08:20:14 -0500
Subject: [PATCH] types

---
 src/utils/isValidIdentifier.ts | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/utils/isValidIdentifier.ts b/src/utils/isValidIdentifier.ts
index d129e1bd9b..6c86967b0a 100644
--- a/src/utils/isValidIdentifier.ts
+++ b/src/utils/isValidIdentifier.ts
@@ -1,6 +1,6 @@
 import { isIdentifierStart, isIdentifierChar } from 'acorn';
 
-export default function isValidIdentifier(str) {
+export default function isValidIdentifier(str: string): boolean {
 	if (!isIdentifierStart(str.charCodeAt(0), true)) return false;
 
 	for (let i = 0; i < str.length; i += 1) {