/**
 * Generic "find the value-axis extent among records whose category
 * position falls inside a visible window" helper. Used by Y Bar,
 * X Bar, Candlestick, and any future categorical-axis chart that
 * wants an auto-fit value axis on zoom.
 *
 * Takes a pre-extracted numeric tuple per record via the `extract`
 * callback instead of reading fields directly, so the same code path
 * handles both Bar's `{ catIdx, y0, y1, axis, seriesId }` shape and
 * Candlestick's `{ xCenter, low, high }` shape.
 *
 * TODO(perf): linear scan. Callers that order records by category
 * index could pre-sort once and binary-search the slice to reduce
 * this to O(log N + K_visible). Deferred until profiling shows the
 * scan in the hot path.
 */
export interface VisibleExtent {
    min: number;
    max: number;
    hasFit: boolean;
}
export interface VisibleExtentRecord {
    /**
     * Position on the categorical axis — compared to the visible window.
     */
    cat: number;
    /**
     * Low bound of the value-axis extent for this record.
     */
    lo: number;
    /**
     * High bound of the value-axis extent for this record.
     */
    hi: number;
    /**
     * True to skip this record (hidden series / wrong axis / etc.).
     */
    skip: boolean;
}
/**
 * Walk `items`, filter by `visCatMin <= cat <= visCatMax` (and the
 * caller-supplied `skip` flag), and return min/max over `lo`/`hi`.
 *
 * Returns `hasFit: false` when the window matches no records, so
 * callers can fall back to the base domain.
 *
 * Zero-range guard: if every visible record shares a single value
 * (flat run), pad by `±|value|` so the axis doesn't collapse to a
 * single pixel.
 */
export declare function computeVisibleExtent<T>(items: readonly T[], visCatMin: number, visCatMax: number, extract: (item: T, out: VisibleExtentRecord) => void, out: VisibleExtent): VisibleExtent;