import { MessagePayload, ScenarioType, TrackingMessage } from "./Constants";
import { IActivity } from "botframework-directlinejs";
/**
 * Determines whether a given activity is a historical message.
 *
 * This function checks if the activity is a message type and uses a combination
 * of legacy tags and timestamp-based logic to determine if the message is historical.
 *
 * @param {IActivity} activity - The activity object to evaluate.
 * @param {number} startTime - The start time (in milliseconds since epoch) to compare against.
 * @returns {boolean} - Returns true if the activity is a historical message, false otherwise.
 *
 * Logic:
 * - If the activity type is not a message, it is not historical.
 * - If the activity contains a legacy history message tag, it is considered historical.
 * - Otherwise, the function extracts a timestamp from the activity ID using `extractTimestampFromId`.
 *   - If the ID is valid and the timestamp is older than the start time, the message is historical.
 */
export declare const isHistoryMessage: (activity: IActivity, startTime: number) => boolean;
export declare const extractTimestampFromId: (activity: IActivity) => number;
export declare const buildMessagePayload: (activity: IActivity, userId: string) => MessagePayload;
export declare const polyfillMessagePayloadForEvent: (activity: IActivity, payload: MessagePayload, conversationId?: string) => MessagePayload;
export declare const getScenarioType: (activity: IActivity) => ScenarioType;
export declare const createTrackingMessage: (payload: MessagePayload, type: string) => TrackingMessage;
export declare const maskPayloadText: (payload: MessagePayload) => MessagePayload;