/**
 * ctx.dataInViewport() — spec: "Viewport Filtering & Statistics" (#6),
 * scoped pragmatically for Phase 4: a per-feature bbox test against
 * `viewport.getBounds()`, using the layer's own compiled `getPosition`
 * accessor for point layers or each GeoJSON feature's own geometry
 * coordinates — no spatial index (kdbush/flatbush) yet, no per-layer
 * `featureBounds` registry descriptor. Correct for reasonable dataset
 * sizes; the optimization is deferred, not the correctness.
 */
import type { MapViewport } from "./basemap";
import type { Shape, ColumnarData } from "./ir";
export declare function filterInViewport(rows: readonly unknown[], shape: Shape, viewport: MapViewport | undefined, getPosition?: (d: unknown) => number[] | undefined): unknown[];
/**
 * The columnar counterpart (spec: "Columnar / GeoArrow Ingestion"). A
 * columnar layer's compiled `getPosition` reads `info.data.columns[...]
 * [info.index]`, never a row object — so filtering must run over INDICES.
 * The (memoized) row view is taken here, not passed in, so its index
 * alignment with `data` is true by construction; `rowFilter` (the
 * declarative filter, applied to the materialized flat row) rides the same
 * loop so a pre-pass can never break that alignment either.
 */
export declare function filterColumnarInViewport(data: ColumnarData, viewport: MapViewport | undefined, getPosition: ((d: unknown, info: {
    index: number;
    data: ColumnarData;
}) => unknown) | undefined, rowFilter?: (row: unknown) => boolean): unknown[];