From 288ad93dbfed9f6828de20de67105ee6d6504425 Mon Sep 17 00:00:00 2001
From: Jordan Harband <ljharb@gmail.com>
Date: Fri, 17 Feb 2017 23:41:35 -0800
Subject: [PATCH] [Refactor] when try/catch is needed, bail early if the value
 lacks an own `lastIndex` data property.

---
 .eslintrc    | 6 +++++-
 index.js     | 9 +++++++++
 package.json | 4 +++-
 3 files changed, 17 insertions(+), 2 deletions(-)

diff --git a/.eslintrc b/.eslintrc
index 29ddad8..fbb8e9d 100644
--- a/.eslintrc
+++ b/.eslintrc
@@ -1,5 +1,9 @@
 {
 	"root": true,
 
-	"extends": "@ljharb"
+	"extends": "@ljharb",
+
+	"rules": {
+		"id-length": [1]
+	}
 }
diff --git a/index.js b/index.js
index 396f45c..0c192c5 100644
--- a/index.js
+++ b/index.js
@@ -1,6 +1,9 @@
 'use strict';
 
+var has = require('has');
 var regexExec = RegExp.prototype.exec;
+var gOPD = Object.getOwnPropertyDescriptor;
+
 var tryRegexExecCall = function tryRegexExec(value) {
 	try {
 		regexExec.call(value);
@@ -21,5 +24,11 @@ module.exports = function isRegex(value) {
 		return toStr.call(value) === regexClass;
 	}
 
+	var descriptor = gOPD(value, 'lastIndex');
+	var hasLastIndexDataProperty = descriptor && has(descriptor, 'value');
+	if (!hasLastIndexDataProperty) {
+		return false;
+	}
+
 	return tryRegexExecCall(value);
 };
diff --git a/package.json b/package.json
index d129e3b..e40d247 100644
--- a/package.json
+++ b/package.json
@@ -34,7 +34,9 @@
 		"regular",
 		"expression"
 	],
-	"dependencies": {},
+	"dependencies": {
+		"has": "^1.0.1"
+	},
 	"devDependencies": {
 		"tape": "^4.6.3",
 		"covert": "^1.1.0",