import type { UnifiedVoice } from "../types";
/**
 * Filter voices by language code
 * @param voices Array of voices to filter
 * @param languageCode BCP-47 language code to filter by
 * @returns Filtered array of voices
 */
export declare function filterByLanguage(voices: UnifiedVoice[], languageCode: string): UnifiedVoice[];
/**
 * Filter voices by gender
 * @param voices Array of voices to filter
 * @param gender Gender to filter by
 * @returns Filtered array of voices
 */
export declare function filterByGender(voices: UnifiedVoice[], gender: "Male" | "Female" | "Unknown"): UnifiedVoice[];
/**
 * Filter voices by provider
 * @param voices Array of voices to filter
 * @param provider Provider to filter by
 * @returns Filtered array of voices
 */
export declare function filterByProvider(voices: UnifiedVoice[], provider: "azure" | "google" | "ibm" | "elevenlabs" | "polly" | "witai" | "playht" | "openai" | "sherpa"): UnifiedVoice[];
/**
 * Find a voice by ID
 * @param voices Array of voices to search
 * @param id Voice ID to find
 * @returns The found voice or undefined
 */
export declare function findById(voices: UnifiedVoice[], id: string): UnifiedVoice | undefined;
/**
 * Get all available languages from a list of voices
 * @param voices Array of voices
 * @returns Array of unique language codes
 */
export declare function getAvailableLanguages(voices: UnifiedVoice[]): string[];