fix(angular): Fix angular SSR issues

packages/core/src/polyfills.ts

@@ -1,24 +1,26 @@
-(function() {
-	if (typeof window["CustomEvent"] === "function") { return false; }
+if (typeof window !== "undefined") {
+	(function() {
+		if (typeof window["CustomEvent"] === "function") { return false; }
 
-	function CustomEvent(event, params) {
-		params = params || { bubbles: false, cancelable: false, detail: undefined };
-		const evt = document.createEvent("CustomEvent");
-		evt.initCustomEvent(event, params.bubbles, params.cancelable, params.detail);
-		return evt;
-	}
+		function CustomEvent(event, params) {
+			params = params || { bubbles: false, cancelable: false, detail: undefined };
+			const evt = document.createEvent("CustomEvent");
+			evt.initCustomEvent(event, params.bubbles, params.cancelable, params.detail);
+			return evt;
+		}
+
+		CustomEvent.prototype = window["Event"].prototype;
+		window["CustomEvent"] = CustomEvent;
+	})();
 
-	CustomEvent.prototype = window["Event"].prototype;
-	window["CustomEvent"] = CustomEvent;
-})();
+	// Avoid multiple instances of babel-polyfill
+	function idempotentBabelPolyfill() {
+		if ((typeof global !== "undefined" && !global["_babelPolyfill"]) || !window["_babelPolyfill"]) {
+			return require("babel-polyfill");
+		}
 
-// Avoid multiple instances of babel-polyfill
-function idempotentBabelPolyfill() {
-	if (!global["_babelPolyfill"] && (typeof window === "undefined" || !window["_babelPolyfill"])) {
-		return require("babel-polyfill");
+		return null;
 	}
 
-	return null;
+	idempotentBabelPolyfill();
 }
-
-idempotentBabelPolyfill();