export interface AggregateResult {
    /** Triangles of the simplified group. Vertex ids >= `firstNewVertex` refer to `newVertices`. */
    indices: Uint32Array;
    error: number;
    /** Widened copies of thinned pieces: positions, and the source vertex each copy takes its other attributes from. */
    newPositions: Float32Array;
    newSources: Uint32Array;
    firstNewVertex: number;
}
/**
 * Simplifies a group of aggregate geometry toward `targetTriangles`. `owner[weld[v]]` is the group using welded
 * vertex v (or -2 when several groups do); `group` is this group's id. Returns null when it cannot remove anything.
 */
export declare function simplifyAggregate(indices: Uint32Array, positions: Float32Array, weld: Uint32Array, owner: Int32Array, group: number, targetTriangles: number): AggregateResult | null;