Checking if window.document defined before trying to resolve url

.vscode/launch.json

@@ -0,0 +1,22 @@
+{
+    "version": "0.2.0",
+    "configurations": [
+        {
+            "type": "node",
+            "request": "launch",
+            "name": "Launch Program",
+            "program": "${workspaceRoot}/client-ts/node_modules/jasmine/bin/jasmine.js",
+            "args": ["JASMINE_CONFIG_PATH=${workspaceRoot}/client-ts/Microsoft.AspNetCore.SignalR.Client.TS.Tests/jasmine.json"],
+            "cwd": "${workspaceRoot}/client-ts",
+            "outFiles": []
+        },
+        {
+            "type": "node",
+            "request": "attach",
+            "name": "Attach to Port",
+            "address": "localhost",
+            "port": 5858,
+            "outFiles": []
+        }
+    ]
+}

client-ts/Microsoft.AspNetCore.SignalR.Client.TS.Tests/Connection.spec.ts

@@ -14,6 +14,13 @@ describe("Connection", () => {
             .toThrow(new Error("Cannot resolve '/test'."));
     });
 
+    it("cannot be created with relative url if window object is not present", () => {
+        (<any>global).window = {};
+        expect(() => new HttpConnection("/test"))
+            .toThrow(new Error("Cannot resolve '/test'."));
+        delete (<any>global).window;
+    });
+
     it("starting connection fails if getting id fails", async (done) => {
         let options: IHttpConnectionOptions = {
             httpClient: <IHttpClient>{

client-ts/Microsoft.AspNetCore.SignalR.Client.TS/HttpConnection.ts

@@ -162,7 +162,7 @@ export class HttpConnection implements IConnection {
             return url;
         }
 
-        if (typeof window === 'undefined') {
+        if (typeof window === 'undefined' || !window || !window.document) {
             throw new Error(`Cannot resolve '${url}'.`);
         }