import type { Config } from '../../config/schema.js';
import { type TTSConfig } from './types.js';
export declare function mergeTtsConfigFromAppConfig(tts: Partial<TTSConfig> | undefined): TTSConfig;
/**
 * User-facing hint when TTS is enabled in settings but no provider can run.
 */
export declare function formatTtsSetupHint(): string;
/**
 * Append readiness / setup guidance when TTS is enabled but unavailable.
 */
export declare function appendTtsReadinessNote(content: string, appConfig: Config | undefined): string;