diff --git a/webAO/global.d.ts b/webAO/global.d.ts
new file mode 100644
index 00000000..8463106f
--- /dev/null
+++ b/webAO/global.d.ts
@@ -0,0 +1,23 @@
+export {};
+
+declare global {
+  interface Window {
+    area_click: (el: HTMLElement) => void;
+    banPlayer: (id: number) => void;
+    changeBlipVolume: () => void;
+    changeMusicVolume: (volume?: number) => void;
+    getIndexFromSelect: (select_box: string, value: string) => number;
+    kickPlayer: (id: number) => void;
+    onReplayGo: (_event: Event) => void;
+    opusCheck: (channel: HTMLAudioElement) => OnErrorEventHandlerNonNull;
+    pickEmotion: (emo: number) => void;
+    pickEvidence: (evidence: number) => void;
+    reloadTheme: () => void;
+    resizeChatbox: () => void;
+    setChatbox: (setstyle: string) => void;
+    showname_click: (_event: Event | null) => void;
+    switchPanTilt: () => Promise<void>;
+    updateActionCommands: (side: string) => void;
+    updateBackgroundPreview: () => void;
+  }
+}