/** Anything placed on the timeline's x axis. */
export interface XPositioned {
    x: number;
}
/**
 * Item indices ordered ascending by `x`, ties broken by input order.
 *
 * Counting sort over uniform x buckets. `x` is affine in time, so cards spread
 * near-uniformly across the domain and buckets stay ~1 deep — O(n) at the
 * sizes that matter, where a comparison sort is O(n log n). Clustered input
 * degrades gracefully rather than falling off a cliff (see the two constants
 * above).
 *
 * Returns indices rather than sorted items so callers can reuse one ordering
 * for several parallel arrays without copying the items themselves.
 */
export declare function orderByX(items: readonly XPositioned[]): Int32Array;
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