import { STT } from '../../agents/providers.js';
import type { GoogleSTTModel } from './models.js';
/** Configuration options for the Google Cloud speech-to-text (STT) provider. */
export type GoogleSTTOptions = {
    /** Google API key. Falls back to the `GOOGLE_API_KEY` environment variable, then `null`. */
    apiKey?: string | null;
    /** Recognition language(s) as BCP-47 tags (e.g. `'en-US'`), a single string or an array (joined with commas). Default `'en-US'`. */
    languages?: string | string[];
    /** Recognition model. Default `'latest_long'`. */
    model?: GoogleSTTModel | string;
    /** Input audio sample rate in Hz. Default `48000`. */
    sampleRate?: number;
    /** Service-account credentials, as a raw JSON string or parsed object. Default `null`. */
    credentialsJson?: string | Record<string, any> | null;
    /** Path to a service-account JSON key file. Read when `credentialsJson` is not provided. */
    serviceAccountPath?: string | null;
    /** Google Cloud project id. Default `null` (derived from the service-account JSON when omitted). */
    projectId?: string | null;
    /** Recognizer location/region. Default `'us'`. */
    location?: string;
    /** Use streaming recognition. Default `true`. */
    stream?: boolean;
    /** Number of audio channels in the input. Default `1`. */
    audioChannelCount?: number;
    /** Emit interim (non-final) transcription results. Default `true`. */
    interimResults?: boolean;
    /** Add automatic punctuation to transcripts. Default `true`. */
    punctuate?: boolean;
    /** Filter profanity from transcripts. Default `false`. */
    profanityFilter?: boolean;
    /** Recognize spoken punctuation (e.g. "comma" -> ","). Default `false`. */
    enableSpokenPunctuation?: boolean;
    /** Recognize spoken emojis. Default `false`. */
    enableSpokenEmojis?: boolean;
    /** Include per-word start/end time offsets. Default `false`. */
    enableWordTimeOffsets?: boolean;
    /** Include per-word confidence scores. Default `false`. */
    enableWordConfidence?: boolean;
    /** Maximum number of recognition alternatives to return. Default `1`. */
    maxAlternatives?: number;
    /** Emit voice-activity (speech begin/end) events. Default `false`. */
    enableVoiceActivityEvents?: boolean;
    /** Timeout in seconds to wait for speech to start. Default `null` (no timeout). */
    speechStartTimeout?: number | null;
    /** Timeout in seconds of silence marking speech end. Default `null` (no timeout). */
    speechEndTimeout?: number | null;
    /** Minimum number of speakers for diarization. Default `null`. */
    minSpeakerCount?: number | null;
    /** Maximum number of speakers for diarization. Default `null`. */
    maxSpeakerCount?: number | null;
    /** Minimum confidence threshold for accepting results, `0.0`-`1.0`. Default `0.0`. */
    minConfidenceThreshold?: number;
    /** Additional/forward-compatible options. */
    [key: string]: any;
};
declare class GoogleSTTImpl extends STT {
    static readonly displayName = "GoogleSTT";
    _providerName: string;
    apiKey: string | null;
    model: string;
    language: string;
    sampleRate: number;
    serviceAccountJson: string | null;
    projectId: string | null;
    location: string;
    stream: boolean;
    audioChannelCount: number;
    interimResults: boolean;
    punctuate: boolean;
    profanityFilter: boolean;
    enableSpokenPunctuation: boolean;
    enableSpokenEmojis: boolean;
    enableWordTimeOffsets: boolean;
    enableWordConfidence: boolean;
    maxAlternatives: number;
    enableVoiceActivityEvents: boolean;
    speechStartTimeout: number | null;
    speechEndTimeout: number | null;
    minSpeakerCount: number | null;
    maxSpeakerCount: number | null;
    minConfidenceThreshold: number;
    constructor(opts?: GoogleSTTOptions);
    getRuntimeConfig(): Record<string, any>;
}
/** A configured Google Cloud STT provider instance. */
export type GoogleSTT = GoogleSTTImpl;
/** Google Cloud speech-to-text (STT) provider. */
export declare const GoogleSTT: (opts?: GoogleSTTOptions) => GoogleSTT;
export {};