/** The lifecycle moments a run can emit. `repeat`/`reverseComplete` are playback-only. */
export type LifecycleEvent = 'start' | 'update' | 'complete' | 'interrupt' | 'repeat' | 'reverseComplete';
export interface LifecycleCallbacks<H = unknown> {
    /** Fired once when the run begins (after any delay). Also fires on the reduced/instant path. */
    onStart?(this: object, handle: H): void;
    /** Per frame with the live value. A number on animatable/playable; the values object on animate(). */
    onUpdate?(this: object, value: number, handle: H): void;
    /** Natural settle to rest. Never fires for an Infinity-repeat run. Fires on the reduced/instant path. */
    onComplete?(this: object, handle: H): void;
    /** Replaced, stopped, teleported, or disposed mid-flight. Never fires on the reduced/instant path. */
    onInterrupt?(this: object, handle: H): void;
    /** Playable only: an iteration boundary (the iteration index is the run's repeat count so far). */
    onRepeat?(this: object, handle: H): void;
    /** Playable only: a reversed leg reached its start. */
    onReverseComplete?(this: object, handle: H): void;
    /** The `this` receiver for every callback. Defaults to the handle. */
    scope?: object;
}
export interface LifecycleRegistry<H> {
    /** Load the callbacks (and scope) from an options bag. Ignores a missing/empty bag. */
    seed(callbacks: LifecycleCallbacks<H> | undefined): void;
    /** Attach or (with null) clear one event's callback - the post-hoc eventCallback path. Last writer wins. */
    set(event: LifecycleEvent, fn: ((handle: H) => void) | null): void;
    /** True if anyone is listening for this event (lets callers skip work, e.g. force the JS path for `update`). */
    has(event: LifecycleEvent): boolean;
    /** Invoke the event's callback with the configured scope (`update` also passes the value). */
    fire(event: LifecycleEvent, handle: H, value?: number): void;
}
export declare function lifecycleRegistry<H>(): LifecycleRegistry<H>;
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