export declare class Now {
    static instant(): Instant;
}
export declare class Duration {
    readonly milliseconds: number;
    constructor(milliseconds?: number);
    get seconds(): number;
    static from(param: {
        seconds?: number;
        milliseconds?: number;
    }): Duration;
}
export declare class Instant {
    #private;
    constructor(timestamp: number);
    static compare(a: Instant, b: Instant): number;
    add(d: Duration): Instant;
    since(other: Instant): Duration;
    subtract(d: {
        seconds?: number;
        milliseconds?: number;
    }): Instant;
}