import * as err from "./errors";
import { Event } from "pondjs";
export declare function timestampFromArg(arg: any): Date;
export declare class InvalidTimestampError extends err.CustomException {
    constructor(arg: any);
}
export declare class EmptyTimeRangeError extends err.CustomException {
    constructor(arg: string);
}
export declare class TimeMismatchError extends err.CustomException {
    constructor(time1: any, time2: any);
}
/**
 * Merge an array of events, with possibly overlapping keys, but keeping the
 * last non-nil value.
 *
 * @param   {[Events]} events   - Array of events
 * @return {Event}             - Merged event
 */
export declare function mergeEvents(events: Array<any>): Event;