export type ClusterLayoutId = string | number;
export interface ClusterLayoutRequest {
    ids: ClusterLayoutId[];
    /** Packed lat/lng pairs (Float64 preferred for geo precision). */
    coords: Float64Array | Float32Array;
    zoomBucket: number;
    /** Cluster radius in CSS/world pixels at the clustered zoom (Leaflet-style). */
    gridSize: number;
    minPoints: number;
    clusterize: boolean;
    clusterMaxZoom: number;
    clusterMinZoom?: number;
    /** Simple CRS coordinates use x=lng/TILE_SIZE, y=lat/TILE_SIZE. */
    simple?: boolean;
}
export interface ClusterLayoutCluster {
    key: string;
    lat: number;
    lng: number;
    ids: ClusterLayoutId[];
    /** Set when `ids` were not expanded (lazy query). */
    count?: number;
    nodeId?: number;
}
export interface ClusterLayoutSingle {
    id: ClusterLayoutId;
    lat: number;
    lng: number;
}
export interface ClusterLayoutResult {
    clusters: ClusterLayoutCluster[];
    singles: ClusterLayoutSingle[];
}
/** Compact hierarchical greedy index (Leaflet.markercluster / Supercluster family). */
export interface ClusterIndex {
    leafCount: number;
    nodeCount: number;
    maxZoom: number;
    minZoom: number;
    minPoints: number;
    radius: number;
    ids: ClusterLayoutId[];
    x: Float64Array;
    y: Float64Array;
    lat: Float64Array;
    lng: Float64Array;
    weight: Uint32Array;
    zoom: Int8Array;
    parent: Int32Array;
    firstChild: Int32Array;
    nextSibling: Int32Array;
    /** Root node indices per zoom level `minZoom…maxZoom`. */
    trees: Int32Array[];
}
export declare const projectMercator01: (lat: number, lng: number) => {
    x: number;
    y: number;
};
export declare const buildClusterIndex: (input: Omit<ClusterLayoutRequest, "zoomBucket">) => ClusterIndex;
export declare const collectClusterLeaves: (index: ClusterIndex, nodeId: number, out?: ClusterLayoutId[]) => ClusterLayoutId[];
export declare const queryClusterLayout: (index: ClusterIndex, zoomBucket: number, minPoints?: number, options?: {
    expandLeaves?: boolean;
    leafMask?: Uint8Array | null;
}) => ClusterLayoutResult;
export declare const buildClusterLayout: (input: ClusterLayoutRequest) => ClusterLayoutResult;
export declare const buildGreedyClusterLayout: (input: ClusterLayoutRequest) => ClusterLayoutResult;
export declare const encodeClusterIndex: (index: ClusterIndex) => {
    payload: Record<string, unknown>;
    transfer: ArrayBuffer[];
};
export declare function decodeClusterIndex(data: Record<string, unknown>): ClusterIndex;
/** Runtime worker blob: same clustering functions as the main thread (no second copy in the bundle). */
export declare function clusterLayoutWorkerSource(): string;
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