fix: dont log debug info on server

package.json

@@ -1,6 +1,6 @@
 {
   "name": "freestyler",
-  "version": "1.6.3",
+  "version": "1.6.4",
   "description": "5th generation React styling library",
   "main": "lib/index.js",
   "module": "modules/index.js",

src/debug/index.ts

@@ -1,14 +1,22 @@
 import createBroadcaster from './createBroadcaster';
 import {sym} from '../util';
 
-const broadcaster = createBroadcaster();
-const $$debug = sym('debug');
-const channel = process.env.FREESTYLER_PREFIX || 'default';
+let broadcaster: any = {
+    emit: () => {},
+};
 
-if (!window[$$debug]) {
-    window[$$debug] = {};
-}
+const isClient = typeof window === 'object';
+
+if (isClient) {
+    broadcaster = createBroadcaster();
+    const $$debug = sym('debug');
+    const channel = process.env.FREESTYLER_PREFIX || 'default';
 
-window[$$debug][channel] = broadcaster;
+    if (!window[$$debug]) {
+        window[$$debug] = {};
+    }
+
+    window[$$debug][channel] = broadcaster;
+}
 
 export const emit = action => broadcaster.emit(action);