export interface IExpireTracker {
    readonly isExpired: boolean;
    restart(): void;
}
export declare class ExpireTracker implements IExpireTracker {
    readonly lifetimeMs: number;
    private _expiringAt;
    constructor(lifetimeMs: number);
    get isExpired(): boolean;
    restart(): void;
    get remainingMs(): number;
    expire(): void;
}