export interface FixedStepContext {
    readonly frame: number;
    readonly deltaMs: number;
    readonly nowMs: number;
}
export interface RenderContext {
    readonly alpha: number;
    readonly nowMs: number;
    readonly accumulatorMs: number;
    readonly frame: number;
}
export interface LoopCallbacks {
    simulate(step: FixedStepContext): void;
    render?(sample: RenderContext): void;
}
export interface LoopOptions {
    readonly fixedDeltaMs: number;
    readonly maxSubSteps: number;
    readonly maxDeltaMs: number;
    readonly startTimeMs?: number;
    readonly now: () => number;
    readonly schedule: (tick: () => void) => unknown;
}
export declare class FixedTimestepLoop {
    private readonly callbacks;
    private readonly options;
    private accumulatorMs;
    private frame;
    private lastTimeMs;
    private running;
    constructor(callbacks: LoopCallbacks, options?: Partial<LoopOptions>);
    start(): void;
    stop(): void;
    pump(elapsedMs: number): void;
    isRunning(): boolean;
    get frameNumber(): number;
    private tick;
    private advance;
}
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