/**
 * Voice configuration for different languages
 *
 * Maps language codes to TTS voice identifiers and BCP-47 language tags.
 * Default configuration uses Amazon Polly voices via Twilio.
 */
import type { VoiceConfig } from "../types";
/**
 * Get voice configuration for a language, with optional custom overrides.
 *
 * Both maps are read with `Object.hasOwn`: the language is caller-influenced,
 * and a plain `[language]` index resolves inherited keys like `constructor`
 * to a non-`VoiceConfig` value, which reaches TwiML as an undefined voice and
 * breaks speech for the rest of the session.
 */
export declare function getVoiceConfig(language: string, customVoices?: Record<string, VoiceConfig>): VoiceConfig;
/**
 * Get the default voice map (useful for consumers who want to extend it)
 */
export declare function getDefaultVoices(): Record<string, VoiceConfig>;