export interface Pager {
    /** Ref for each element that slides. The time grid has two, its head and its body. */
    trackRef: (element: HTMLElement | null) => void;
    /** Width of one pane. */
    width: () => number;
    /** Offset every track by `dx` px, following the finger. */
    move: (dx: number) => void;
    /** Animate to the next (`1`) or previous (`-1`) pane and page, or back (`0`). */
    settle: (step: -1 | 0 | 1) => void;
    /** Jump to the end of a running settle: a new press arrived before it finished. */
    finish: () => void;
}
/**
 * Drives the three panes a pageable view renders: previous, current and next, keyed by period, so
 * after paging the pane that slid in is the same DOM node as the one now current. The track is
 * reset in the same commit that swaps them, which is why nothing flashes.
 *
 * `focusFallback` receives focus when it would otherwise be left inside a pane that just went inert.
 */
export declare function usePager(periodKey: string, onPage: (step: 1 | -1) => void, focusFallback: () => HTMLElement | null): Pager;