From a09813204545bec306512b29197edcff0dfbe046 Mon Sep 17 00:00:00 2001
From: Jay Phelps <hello@jayphelps.com>
Date: Fri, 9 Sep 2016 13:15:19 -0700
Subject: [PATCH] fix(root): find global context (window/self/global) in a more
 safe way Closes #1930

---
 spec/util/root-spec.ts |  9 +++++++++
 src/util/root.ts       | 25 ++++++++++++-------------
 2 files changed, 21 insertions(+), 13 deletions(-)
 create mode 100644 spec/util/root-spec.ts

diff --git a/spec/util/root-spec.ts b/spec/util/root-spec.ts
new file mode 100644
index 0000000000..70f83c6905
--- /dev/null
+++ b/spec/util/root-spec.ts
@@ -0,0 +1,9 @@
+import { expect } from 'chai';
+import { root } from '../../dist/cjs/util/root';
+
+/** @test {root} */
+describe('root', () => {
+  it('should exist', () => {
+    expect(typeof root).to.equal('object');
+  });
+});
diff --git a/src/util/root.ts b/src/util/root.ts
index a08c0507ad..0c0a3c3951 100644
--- a/src/util/root.ts
+++ b/src/util/root.ts
@@ -1,12 +1,3 @@
-let objectTypes = {
-  'boolean': false,
-  'function': true,
-  'object': true,
-  'number': false,
-  'string': false,
-  'undefined': false
-};
-
 declare let global: NodeJS.Global;
 declare let module: any;
 declare let exports: any;
@@ -18,9 +9,17 @@ declare module NodeJS {
   }
 }
 
-export let root: any = (objectTypes[typeof self] && self) || (objectTypes[typeof window] && window);
+/**
+ * window: browser in DOM main thread
+ * self: browser in WebWorker
+ * global: Node.js/other
+ */
+export const root: any = (
+     typeof window == 'object' && window.window === window && window
+  || typeof self == 'object' && self.self === self && self
+  || typeof global == 'object' && global.global === global && global
+);
 
-let freeGlobal = objectTypes[typeof global] && global;
-if (freeGlobal && (freeGlobal.global === freeGlobal || freeGlobal.window === freeGlobal)) {
-  root = freeGlobal;
+if (!root) {
+  throw new Error('RxJS could not find any global context (window, self, global)');
 }