fix: Add isArray util to prevent undefined stack.stack (#1140)

Author: kamilogorek

src/raven.js

@@ -11,6 +11,7 @@ var isErrorEvent = utils.isErrorEvent;
 var isUndefined = utils.isUndefined;
 var isFunction = utils.isFunction;
 var isString = utils.isString;
+var isArray = utils.isArray;
 var isEmptyObject = utils.isEmptyObject;
 var each = utils.each;
 var objectMerge = utils.objectMerge;
@@ -481,8 +482,7 @@ Raven.prototype = {
     var stack = TraceKit.computeStackTrace(ex);
 
     // stack[0] is `throw new Error(msg)` call itself, we are interested in the frame that was just before that, stack[1]
-    var initialCall = stack.stack[1];
-
+    var initialCall = isArray(stack.stack) && stack.stack[1];
     var fileurl = (initialCall && initialCall.url) || '';
 
     if (

src/utils.js

@@ -38,6 +38,10 @@ function isString(what) {
   return Object.prototype.toString.call(what) === '[object String]';
 }
 
+function isArray(what) {
+  return Object.prototype.toString.call(what) === '[object Array]';
+}
+
 function isEmptyObject(what) {
   for (var _ in what) {
     if (what.hasOwnProperty(_)) {
@@ -371,6 +375,7 @@ module.exports = {
   isUndefined: isUndefined,
   isFunction: isFunction,
   isString: isString,
+  isArray: isArray,
   isEmptyObject: isEmptyObject,
   supportsErrorEvent: supportsErrorEvent,
   wrappedCallback: wrappedCallback,

test/utils.test.js

@@ -8,6 +8,7 @@ var utils = require('../src/utils');
 var isUndefined = utils.isUndefined;
 var isFunction = utils.isFunction;
 var isString = utils.isString;
+var isArray = utils.isArray;
 var isObject = utils.isObject;
 var isEmptyObject = utils.isEmptyObject;
 var isError = utils.isError;
@@ -52,6 +53,17 @@ describe('utils', function() {
     });
   });
 
+  describe('isArray', function() {
+    it('should do as advertised', function() {
+      assert.isTrue(isArray([]));
+      assert.isTrue(isArray(new Array(42)));
+      assert.isFalse(isArray(''));
+      assert.isFalse(isArray({}));
+      assert.isFalse(isArray(undefined));
+      assert.isFalse(isArray(function() {}));
+    });
+  });
+
   describe('isObject', function() {
     it('should do as advertised', function() {
       assert.isTrue(isObject({}));