/**
 * Alpha shape (2-D) — a consumer of the Delaunay triangulation.
 *
 * An alpha shape generalises the convex hull: it keeps only the Delaunay
 * triangles whose circumradius is `≤ 1/alpha`, then returns the boundary of
 * that region (edges belonging to exactly one kept triangle). Large `alpha`
 * hugs the point set tightly; `alpha → 0` recovers the convex hull. With the
 * right `alpha`, an annulus-shaped point cloud yields a shape with a hole.
 *
 * Pinned on a known shape (annulus → recovers the hole: two boundary loops) in
 * `functions/tests/geometry-consumers-oracle.test.ts`.
 *
 * @packageDocumentation
 */
/** Structured alpha-shape result. */
export interface AlphaShapeResult {
    /** Kept Delaunay triangles (circumradius ≤ 1/alpha), as index triples. */
    triangles: number[][];
    /**
     * Boundary edges of the alpha shape — the edges that belong to exactly one
     * kept triangle — as index pairs `[i, j]` with `i < j`.
     */
    edges: number[][];
}
/**
 * Alpha shape of a set of 2-D points.
 *
 * @param points - Array of `[x, y]` points (at least 3, not all collinear).
 * @param alpha - Positive alpha parameter; triangles with circumradius `≤ 1/alpha`
 *   are kept. Smaller `alpha` → looser shape (→ convex hull); larger `alpha` →
 *   tighter shape that can open holes/concavities.
 * @returns An {@link AlphaShapeResult} (kept triangles + boundary edges).
 * @throws When given fewer than 3 points, a non-2-D point set, or `alpha ≤ 0`.
 */
export declare function alphaShape(points: number[][], alpha: number): AlphaShapeResult;
//# sourceMappingURL=alpha-shape.d.ts.map