import { ConversationState, MessageState, ParticipantState } from "./state/ConversationState";
/**
 * @classdesc Helper class for chat conversations
 * @category Helpers
 */
export declare class ConversationHelper {
    private conversation;
    constructor(conversation: ConversationState);
    /**
     * Returns the last chat message object.
     * @readonly
     * @type {MessageState}
     * @since 2.0.0
     * @example
     * import { ConversationHelper, StateHelper } from "@twilio/flex-ui";
     * const conversationState = StateHelper.getConversationStateForTask(task);
     * const conversationHelper = new ConversationHelper(conversationState);
     * console.log(conversationHelper.lastMessage);
     */
    get lastMessage(): MessageState;
    /**
     * Gets all conversation participants who are currently typing (except you).
     * @readonly
     * @type {Array<ParticipantState>}
     * @since 2.0.0
     * @example
     * import { ConversationHelper, StateHelper } from "@twilio/flex-ui";
     * const conversationState = StateHelper.getConversationStateForTask(task);
     * const conversationHelper = new ConversationHelper(conversationState);
     * console.log(conversationHelper.typers);
     */
    get typers(): Array<ParticipantState>;
    /**
     * Returns true if the customer is online, false if not.
     * @readonly
     * @type {boolean}
     * @since 2.0.0
     * @example
     * import { ConversationHelper, StateHelper } from "@twilio/flex-ui";
     * const conversationState = StateHelper.getConversationStateForTask(task);
     * const conversationHelper = new ConversationHelper(conversationState);
     * console.log(conversationHelper.isCustomerOnline);
     */
    get isCustomerOnline(): boolean;
    /**
     * Returns the conversation type. If not found, it returns the channel type. Otherwise, returns null.
     * @readonly
     * @type {null | string}
     * @since 2.0.0
     * @example
     * import { ConversationHelper, StateHelper } from "@twilio/flex-ui";
     * const conversationState = StateHelper.getConversationStateForTask(task);
     * const conversationHelper = new ConversationHelper(conversationState);
     * console.log(conversationHelper.conversationType); // Returns conversation type
     */
    get conversationType(): null | string;
    /**
     * Checks whether the current user is participant of the conversation passed.
     * @static
     * @returns {boolean} true if the current user is participant of the conversation passed, false if not
     * @param {ConversationState} conversation The conversation state object
     * @since 2.0.0
     * @example
     * import { ConversationHelper, StateHelper } from "@twilio/flex-ui";
     * const conversationState = StateHelper.getConversationStateForTask(task);
     * console.log(ConversationHelper.isUserParticipantOfConversation(conversationState));
     */
    static isUserParticipantOfConversation(conversation: ConversationState): boolean;
    /**
     * Returns the conversation's email participants.
     * @static
     * @returns {Array<string[], string[]>} The returned array has two items:
     * - at index 0 it's an array of strings with the "to" email participants.
     * - at index 1 it's an array of strings with the "cc" email participants.
     * @param {ConversationState} conversation The conversation state object
     * @since 2.0.0
     * @example
     * import { ConversationHelper, StateHelper } from "@twilio/flex-ui";
     * const conversationState = StateHelper.getConversationStateForTask(task);
     * const [to, cc] = ConversationHelper.getEmailParticipants(conversationState);
     */
    static getEmailParticipants(conversation: ConversationState): [string[], string[]];
}
export declare class ChatChannelHelper extends ConversationHelper {
    /**
     * @deprecated
     * @deprecatedSince 2.0.0
     * @altRecommendation Use `conversationType` instead
     * @altRecommendationExample
     * import { ConversationHelper, StateHelper } from "@twilio/flex-ui";
     * const conversationState = StateHelper.getConversationStateForTask(task);
     * const conversationHelper = new ConversationHelper(conversationState);
     * console.log(conversationHelper.conversationType); // Returns conversation type
     * @altRecommendationLink https://assets.flex.twilio.com/docs/releases/flex-ui/latest/advanced/helpers/ConversationHelper/
     * @private
     * */
    get channelType(): string;
}