import type { Pcm } from './audio.js';
export interface SamiCreds {
    accessKey: string;
    secretKey: string;
    appkey: string;
    /** Optional endpoint overrides. Default to the standard SAMI endpoints; set
     *  these (or SAMI_TOKEN_URL / SAMI_WS_URL env) only to point elsewhere. */
    tokenUrl?: string;
    wsUrl?: string;
}
export interface VoiceProviderEffectOptions {
    beforeProviderEffect?: () => void | Promise<void>;
}
/** Mint a short-lived SAMI token (default 24h). Two-step HMAC: sign the
 *  canonical string with the SecretKey, then HMAC an empty body with that. */
export declare function mintSamiToken(creds: SamiCreds, expiration?: number, effects?: VoiceProviderEffectOptions): Promise<string>;
export interface SamiSynthOpts {
    speaker: string;
    /** 1.0 = normal. bigtts voices honour speech_rate via post_process. */
    rate?: number;
    timeoutMs?: number;
}
/** Synthesize text → raw PCM (s16le mono, 24kHz) via the tts.sync WebSocket. */
export declare function samiSynthesizePcm(creds: SamiCreds, text: string, opts: SamiSynthOpts, effects?: VoiceProviderEffectOptions): Promise<Pcm>;
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