/** Tipos mínimos para Web Speech API (Chrome / Safari). */
interface SpeechRecognitionEventMap {
    audioend: Event;
    audiostart: Event;
    end: Event;
    error: SpeechRecognitionErrorEvent;
    nomatch: Event;
    result: SpeechRecognitionEvent;
    soundend: Event;
    soundstart: Event;
    speechend: Event;
    speechstart: Event;
    start: Event;
}

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

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

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

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

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

interface SpeechRecognition extends EventTarget {
    continuous: boolean;
    grammars: unknown;
    interimResults: boolean;
    lang: string;
    maxAlternatives: number;
    onaudioend: ((this: SpeechRecognition, ev: Event) => void) | null;
    onaudiostart: ((this: SpeechRecognition, ev: Event) => void) | null;
    onend: ((this: SpeechRecognition, ev: Event) => void) | null;
    onerror: ((this: SpeechRecognition, ev: SpeechRecognitionErrorEvent) => void) | null;
    onnomatch: ((this: SpeechRecognition, ev: Event) => void) | null;
    onresult: ((this: SpeechRecognition, ev: SpeechRecognitionEvent) => void) | null;
    onsoundend: ((this: SpeechRecognition, ev: Event) => void) | null;
    onsoundstart: ((this: SpeechRecognition, ev: Event) => void) | null;
    onspeechend: ((this: SpeechRecognition, ev: Event) => void) | null;
    onspeechstart: ((this: SpeechRecognition, ev: Event) => void) | null;
    onstart: ((this: SpeechRecognition, ev: Event) => void) | null;
    abort(): void;
    start(): void;
    stop(): void;
}

interface SpeechRecognitionConstructor {
    new (): SpeechRecognition;
}

interface Window {
    SpeechRecognition?: SpeechRecognitionConstructor;
    webkitSpeechRecognition?: SpeechRecognitionConstructor;
}