/**
 * Coalescing scheduler.
 *
 * Layout is triggered from many independent sources — a container resize, an
 * individual item resizing, an image finishing decode, a prop change. When a
 * grid of 200 images hydrates, every one of those loads would otherwise force
 * its own full relayout.
 *
 * `schedule()` collapses any number of calls made before the next animation
 * frame into a single invocation, so a burst costs one layout pass.
 */
export interface Scheduler {
    /** Request a run on the next frame. Repeat calls before it fires are free. */
    schedule(): void;
    /** Run immediately, cancelling any pending frame. */
    flush(): void;
    /** Drop any pending frame without running. */
    cancel(): void;
}
export declare function createScheduler(fn: () => void): Scheduler;