import { BaseError } from 'make-error';
import { Constrained } from '../../core';
export declare class InvalidISO8601TimestampError extends BaseError {
    constructor();
}
export declare const iso8601TimestampSymbol: unique symbol;
export type ISO8601Timestamp = Constrained<typeof iso8601TimestampSymbol, string>;
export declare function isISO8601Timestamp(input: unknown): input is ISO8601Timestamp;
export declare function iso8601Timestamp(input: unknown): ISO8601Timestamp;