/**
 * Orientation-neutral helpers shared by the horizontal and vertical
 * hierarchical categorical axes. Both axis painters specialize on top of
 * this core; the only thing they disagree on is where bracket lines and
 * leaf labels land on the plot chrome.
 */
/**
 * One run of consecutive equal dictionary indices in a level's `indices`
 * array, with the label pre-resolved. Used by the outer-level bracket
 * renderer to coalesce a span of contiguous cells into a single labelled
 * group.
 */
export interface GroupRun {
    startIdx: number;
    /**
     * Inclusive.
     */
    endIdx: number;
    label: string;
}
/**
 * Single-pass run-length encoding of `indices[startRow..endRow)` keyed
 * by `dictionary`. Relies on perspective's guarantee that rows sharing
 * an outer-level dictionary entry are emitted contiguously in traversal
 * order — equal neighbours always belong to the same span. The emitted
 * `label` is a direct reference into `dictionary` (no per-row copy).
 */
export declare function buildGroupRuns(indices: Int32Array | ArrayLike<number>, dictionary: string[], startRow: number, endRow: number): GroupRun[];
/**
 * Longest string length in a dictionary. O(dictSize), not O(numRows).
 * Drives the rotation decision on the leaf level of the X axis and the
 * column-width decision on the Y axis.
 */
export declare function maxDictLength(dictionary: string[]): number;
/**
 * Filter a precomputed `runs` array to those whose index range
 * intersects `[visMin, visMax]` (inclusive on both sides). Runs that
 * straddle an endpoint are clipped so the caller sees `startIdx`/
 * `endIdx` pinned to the visible slice — this matches the legacy
 * `buildGroupRuns(indices, visMin, visMax + 1)` return shape.
 */
export declare function runsInRange(runs: GroupRun[], visMin: number, visMax: number): GroupRun[];