type TtsStore = {
    ttsState: string;
    stringToSpeak: string | null;
    isMuted: boolean;
    resolveOnSpeakEnd: any;
    rejectOnSpeakEnd: any;
    shouldSkipPrompt: boolean;
};
declare function ttsReducer(state: TtsStore | undefined, action: any): TtsStore;
export { ttsReducer };