/**
 * Streaming tree pipeline shared by treemap and sunburst. Rows arrive
 * incrementally; each chunk inserts its rows directly into the SOA
 * tree. Per-leaf tooltip columns are fetched lazily on pin via the
 * chart's `_lazyRows`; the tree only retains `leafRowIdx` per leaf
 * (small, O(leaves)) as the handle back to the source view row.
 * After a chunk is processed, `finalizeTree` recomputes `value`
 * bottom-up.
 *
 * Color mode:
 *   - `"numeric"` — `readColor` reads the row's numeric value; the
 *     render path maps it through the continuous gradient.
 *   - `"series"` — `readColor` reads the row's string value from the
 *     color column's dictionary, and `seedColorLabels` pre-populates
 *     `_uniqueColorLabels` in dictionary-index order. Render picks
 *     `palette[dictIdx % paletteSize]`.
 *   - `"empty"` — no color column; every leaf gets `palette[0]`.
 *
 * When `_splitBy` is populated, every row is duplicated — one insertion
 * per split prefix, with that prefix pushed as the top-level path
 * segment so the top-level children of the synthetic root become
 * facet roots. The per-prefix `size` / `color` columns (named
 * `${prefix}|${base}`) feed the facet's values. `seedColorLabels`
 * runs once per split so every split's dictionary contributes to the
 * shared legend.
 */
import type { ColumnDataMap } from "../../data/view-reader";
import type { TreeChartBase } from "./tree-chart";
/**
 * Reset the shared tree state. Called on the first chunk
 * (`startRow === 0`) of each dataset load.
 */
export declare function resetTreeState(chart: TreeChartBase): void;
/**
 * Process one incoming chunk: grow row-data buffers, walk every row,
 * capture column values, and insert into the tree.
 */
export declare function processTreeChunk(chart: TreeChartBase, columns: ColumnDataMap): void;
/**
 * Post-chunk finalization.
 *   1. Recompute `value` bottom-up from `size` via an iterative
 *      post-order walk.
 *   2. Re-resolve `_currentRootId` from the breadcrumb name-path so
 *      drill state survives incremental chunk arrivals.
 *
 * `colorLabel` is set at insert time (`readColor`) and needs no
 * post-pass: in `"series"` mode it comes from the color column's
 * dictionary, and in `"numeric"` / `"empty"` modes it's unused.
 */
export declare function finalizeTree(chart: TreeChartBase): void;
/**
 * Rebuild `chart._breadcrumbIds` by walking up from `nodeId`.
 */
export declare function rebuildBreadcrumbs(chart: TreeChartBase, nodeId: number): void;