fix: usage in environment without window

Signed-off-by: Grigorii K. Shartsev <me@shgk.me>

Author: ShGKme

lib/index.ts

@@ -1,17 +1,18 @@
-/**
+/*!
  * SPDX-FileCopyrightText: 2020 Nextcloud GmbH and Nextcloud contributors
  * SPDX-License-Identifier: GPL-3.0-or-later
  */
+
 import { loadState } from '@nextcloud/initial-state'
 
 export function getCapabilities(): Object {
 	try {
 		return loadState('core', 'capabilities')
 	} catch (error) {
 		console.debug('Could not find capabilities initial state fall back to _oc_capabilities')
-		if (!('_oc_capabilities' in window)) {
+		if (!('_oc_capabilities' in globalThis)) {
 			return {}
 		}
-		return window['_oc_capabilities'] as Object
+		return globalThis['_oc_capabilities'] as Object
 	}
 }