declare global { interface Window { addEventListener( type: 'devtoolschange', listener: (event: DevToolsEvent) => unknown, options?: boolean | AddEventListenerOptions ): void; removeEventListener( type: 'devtoolschange', listener: (event: DevToolsEvent) => unknown, options?: boolean | EventListenerOptions ): void; } } export type Orientation = 'vertical' | 'horizontal'; export interface DevToolsEvent extends Event { detail: typeof devTools; } declare const devTools: { /** Whether DevTools is open. */ readonly isOpen: boolean; /** Orientation of the DevTools if it's open. */ readonly orientation?: Orientation; }; export default devTools;