export interface IdleWindowConfig {
    maxSeconds?: number;
    efficiency?: number;
}
export interface IdleWindow {
    elapsedSeconds: number;
    effectiveSeconds: number;
    capped: boolean;
}
/** @internal */
export declare function idleWindow(lastSeenMs: number, nowMs: number, config?: IdleWindowConfig): IdleWindow;
export interface LinearCatchUpInput {
    current: number;
    ratePerSecond: number;
    min?: number;
    max?: number;
}
/** @internal */
export declare function linearCatchUp(seconds: number, input: LinearCatchUpInput): number;
export interface ExponentialCatchUpInput {
    current: number;
    factorPerSecond: number;
    min?: number;
    max?: number;
}
/** @internal */
export declare function exponentialCatchUp(seconds: number, input: ExponentialCatchUpInput): number;
export interface SteppedCatchUpResult {
    steps: number;
    remainderSeconds: number;
}
/** @internal */
export declare function steppedCatchUp(seconds: number, stepSeconds: number, step: (index: number) => void, maxSteps?: number): SteppedCatchUpResult;