import { NCCOActions } from '../../enums/NCCOActions.mjs';
import { TTSLanguages } from '../../enums/TTSLanguages.mjs';
import { TalkAction } from '../../types/NCCO/TalkAction.mjs';
import { Serializable } from '../../interfaces/NCCO/Serializable.mjs';

/**
 * Represents a Talk action in a Nexmo Call Control Object (NCCO).
 *
 * This action allows the text-to-speech (TTS) synthesis of spoken words in the call.
 */
declare class Talk implements TalkAction, Serializable {
    /**
     * The action type for this NCCO action.
     */
    action: NCCOActions.TALK;
    /**
     * The text to be spoken during the call.
     */
    text: string;
    /**
     * Indicates whether the talk action allows barge-in (optional).
     */
    bargeIn?: boolean;
    /**
     * The number of times to loop the speech (optional).
     */
    loop?: number;
    /**
     * The audio level at which to play the speech (optional).
     */
    level?: string;
    /**
     * The language for the text-to-speech synthesis (optional).
     */
    language?: TTSLanguages | string;
    /**
     * The speech style (optional).
     */
    style?: string;
    /**
     * Indicates whether to use premium text-to-speech (optional).
     */
    premium?: boolean;
    /**
     * Creates a new Talk action.
     *
     * @param {string} text - The text to be spoken during the call.
     * @param {boolean} [bargeIn] - Indicates whether the talk action allows barge-in (optional).
     * @param {number} [loop] - The number of times to loop the speech (optional).
     * @param {string} [level] - The audio level at which to play the speech (optional).
     * @param {TTSLanguages | string} [language] - The language for the text-to-speech synthesis (optional).
     * @param {string} [style] - The speech style (optional).
     * @param {boolean} [premium] - Indicates whether to use premium text-to-speech (optional).
     */
    constructor(text: string, bargeIn?: boolean, loop?: number, level?: string, language?: TTSLanguages | string, style?: string, premium?: boolean);
    /**
     * Serializes the Talk action to a Nexmo Call Control Object (NCCO).
     *
     * @return {TalkAction} - The serialized Talk action.
     */
    serializeToNCCO(): TalkAction;
}

export { Talk };