/**
 * scheduler — the game loop that separates "something changed" from "draw now"
 * (ADR-0006). Coalesces requests, caps FPS, sleeps when idle, and allows a
 * synchronous render.
 */
import type { Disposable } from '../events/index.js';
export interface SchedulerOptions {
    readonly fps?: number | 'uncapped';
    readonly onRender: () => void;
}
export interface Scheduler {
    requestRender(reason?: string): void;
    renderSync(): void;
    start(): void;
    stop(): void;
    setFps(fps: number | 'uncapped'): void;
    onFrame(cb: (dtMs: number) => void): Disposable;
    readonly running: boolean;
    readonly dirty: boolean;
}
export declare function createScheduler(options: SchedulerOptions): Scheduler;
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