/**
 * Decides whether the pill background should be painted on the marker surface.
 *
 * The pill background is opaque while the marker is in pill state and is held
 * for the duration of the collapse morph after `isPill` flips back to `false`.
 * Without this lingering paint, the background would drop to transparent the
 * instant the state changes, leaving the stick line visible through the
 * collapsing surface for the entire morph (asymmetric with expand, where the
 * background is opaque from the first frame).
 *
 * `lingerMs` should match the padding/border CSS transition duration so the
 * paint flips off exactly when the surface has finished collapsing back to a
 * circle.
 */
export declare const usePillBackgroundPaint: (isPill: boolean, lingerMs: number) => boolean;