import type { PlacementState } from './placementCore';
import type { PlacementCapabilities, PlacementMode, PlacementTarget } from './placementTarget';
import type { PointCloudPlacement } from '../pointcloud/pointCloudPlacement';
import type * as THREE from 'three';
type ChangedListener = (state: PlacementState | null) => void;
/** The slice of a placement session React reads. Both the core and its adapters satisfy it. */
export interface PlacementStateSource {
    readonly activeTarget: PlacementTarget | null;
    readonly mode: PlacementMode;
    readonly pivot: THREE.Vector3 | null;
    readonly capabilities: PlacementCapabilities | null;
    placement(): PointCloudPlacement | null;
    onChanged: {
        add(listener: ChangedListener): void;
        remove(listener: ChangedListener): void;
    };
}
/** Mirrors the live placement session into React. The component owns it; this reads. */
export declare function usePlacementState(source: PlacementStateSource | null): PlacementState | null;
export {};
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