/** A sampled pair of snapshots and interpolation factor. */
export type SnapshotBufferSample<T> = {
    before: T;
    after: T;
    alpha: number;
};
/** Serializable snapshot-buffer state. */
export type SnapshotBufferState<T> = {
    delayMs: number;
    capacity: number;
    entries: Array<{
        atMs: number;
        value: T;
    }>;
};
/** Handle for a timestamped delayed snapshot buffer. */
export type SnapshotBuffer<T> = {
    push(atMs: number, value: T): void;
    sampleAt(nowMs: number): SnapshotBufferSample<T> | null;
    snapshot(): SnapshotBufferState<T>;
    restore(next: SnapshotBufferState<T>): void;
    retune(config: {
        delayMs?: number;
        capacity?: number;
    }): void;
};
/** Stores timestamped snapshots and samples a delayed, interpolatable pair.
 * @capability runtime snapshot interpolation
 */
export declare function createSnapshotBuffer<T>(config: {
    delayMs: number;
    capacity: number;
}): SnapshotBuffer<T>;