app/types/global.d.ts

interface Window {
  showDirectoryPicker(): Promise<FileSystemDirectoryHandle>;
  webkitSpeechRecognition: typeof SpeechRecognition;
  SpeechRecognition: typeof SpeechRecognition;
}

interface Performance {
  memory?: {
    jsHeapSizeLimit: number;
    totalJSHeapSize: number;
    usedJSHeapSize: number;
  };
}