interface SpeechRecognitionErrorEvent extends Event {
  error: any;
  message: string;
}

interface SpeechRecognitionEvent extends Event {
  resultIndex: number;
  results: SpeechRecognitionResultList;
}

interface SpeechRecognitionResultList {
  length: number;
  item(index: number): SpeechRecognitionResult;
  [index: number]: SpeechRecognitionResult;
}

interface SpeechRecognitionResult {
  isFinal: boolean;
  length: number;
  item(index: number): SpeechRecognitionAlternative;
  [index: number]: SpeechRecognitionAlternative;
}

interface SpeechRecognitionAlternative {
  transcript: string;
  confidence: number;
}

interface SpeechRecognition extends EventTarget {
  continuous: boolean;
  interimResults: boolean;
  lang: string;
  maxAlternatives: number;
  onerror: ((this: SpeechRecognition, ev: SpeechRecognitionErrorEvent) => any) | null;
  onend: ((this: SpeechRecognition, ev: Event) => any) | null;
  onresult: ((this: SpeechRecognition, ev: SpeechRecognitionEvent) => any) | null;
  onstart: ((this: SpeechRecognition, ev: Event) => any) | null;
  onspeechend: ((this: SpeechRecognition, ev: Event) => any) | null;
  start(): void;
  stop(): void;
}

interface SpeechSynthesisErrorEvent extends Event {
  error: string;
  utterance: SpeechSynthesisUtterance;
}

interface SpeechSynthesisVoice {
  default: boolean;
  lang: string;
  localService: boolean;
  name: string;
  voiceURI: string;
}

declare global {
  const SpeechRecognition: {
    new(): SpeechRecognition;
    prototype: SpeechRecognition;
  };

  interface Window {
    SpeechRecognition: typeof SpeechRecognition;
    webkitSpeechRecognition: typeof SpeechRecognition;
  }
}

export type {
  SpeechRecognition,
  SpeechRecognitionEvent,
  SpeechRecognitionErrorEvent,
  SpeechRecognitionResultList,
  SpeechRecognitionResult,
  SpeechRecognitionAlternative,
  SpeechSynthesisErrorEvent,
  SpeechSynthesisVoice
};