import { STT } from '../../agents/providers.js';
import type { AssemblyAISTTModel } from './models.js';
/** Configuration options for the {@link AssemblyAISTT} provider. */
export type AssemblyAISTTOptions = {
    /** AssemblyAI API key. Falls back to the `ASSEMBLYAI_API_KEY` env var, then `null`. */
    apiKey?: string | null;
    /** Transcription language code. Default: `'en-US'`. */
    language?: string;
    /** Input audio sample rate in Hz. Default: `48000`. */
    inputSampleRate?: number;
    /** Target output sample rate in Hz (alias of `outputSampleRate`). Default: `16000`. */
    targetSampleRate?: number;
    /** Output audio sample rate in Hz. Default: `16000`. */
    outputSampleRate?: number;
    /** Audio encoding. Default: `'pcm_s16le'`. */
    encoding?: string;
    /** Whether to apply turn formatting (punctuation/casing). Default: `true`. */
    formatTurns?: boolean;
    /** Keyterms to bias recognition toward. Default: `null`. */
    keytermsPrompt?: string[] | null;
    /** Confidence threshold for declaring end of turn. Range `0`-`1`. Default: `0.4`. */
    endOfTurnConfidenceThreshold?: number;
    /** Minimum silence (ms) before end of turn when confidence is high. Default: `560`. */
    minEndOfTurnSilenceWhenConfident?: number;
    /** Maximum silence (ms) allowed within a turn. Default: `2400`. */
    maxTurnSilence?: number;
    /** Speech model to use. Default: `'universal-streaming-english'`. */
    speechModel?: AssemblyAISTTModel | string;
    /** Enable automatic language detection. Default: `false`. */
    languageDetection?: boolean;
    /** Override the provider base URL. Default: `null`. */
    baseUrl?: string | null;
    /** Service region. Default: `'US'`. */
    region?: string;
};
declare class AssemblyAISTTImpl extends STT {
    static readonly displayName = "AssemblyAISTT";
    _providerName: string;
    apiKey: string | null;
    model: string;
    language: string;
    sampleRate: number;
    inputSampleRate: number;
    outputSampleRate: number;
    encoding: string;
    formatTurns: boolean;
    endOfTurnConfidenceThreshold: number;
    minEndOfTurnSilenceWhenConfident: number;
    maxTurnSilence: number;
    keytermsPrompt: string[] | null;
    languageDetection: boolean;
    baseUrl: string | null;
    region: string;
    constructor(opts?: AssemblyAISTTOptions);
    getRuntimeConfig(): Record<string, any>;
}
export type AssemblyAISTT = AssemblyAISTTImpl;
/**
 * AssemblyAI speech-to-text provider.
 *
 * Creates a configured AssemblyAI streaming STT provider for use in a voice agent.
 */
export declare const AssemblyAISTT: (opts?: AssemblyAISTTOptions) => AssemblyAISTT;
export {};