import type { FrameDriver } from './driver';
export interface FrameInfo {
    /** Time since the previous frame, in ms. 0 on the first frame after a wake. */
    deltaMs: number;
    /** Driver timestamp of this frame, in ms. */
    timestampMs: number;
}
export type FrameCallback = (frame: FrameInfo) => void;
/**
 * 'update' (default) runs simulations; 'render' runs DOM writes, after every
 * update of the same tick. A render subscription made during the update phase
 * still runs this tick - that is what lets bindings batch all style writes
 * produced by a frame into a single flush.
 */
export type FramePhase = 'update' | 'render';
export interface Scheduler {
    /** Register a per-frame callback. Starts the loop if it was sleeping. */
    subscribe(callback: FrameCallback, phase?: FramePhase): () => void;
    isRunning(): boolean;
}
/**
 * Upper bound on the delta fed to subscribers. After a freeze (inactive tab,
 * GC pause, breakpoint) the lost time is dropped, never replayed: physics
 * must not teleport.
 */
export declare const MAX_FRAME_DELTA_MS = 64;
export declare function createScheduler(driver: FrameDriver): Scheduler;
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