import { LogEntry, LogMiddleware, MiddlewareContext } from '../types';
export declare class TimestampMiddleware implements LogMiddleware {
    private options;
    readonly name = "TimestampMiddleware";
    constructor(options?: {
        format?: 'iso' | 'locale' | 'unix';
        timezone?: string;
    });
    execute(entry: LogEntry, _context: MiddlewareContext, next: () => Promise<void> | void): Promise<void>;
}