import { type Entity, type MapInteractionState } from "@trackunit/react-map-adapter-shared";
type SelectAction = Readonly<{
    type: "SELECT";
    entity: Entity | null;
}>;
type HoverAction = Readonly<{
    type: "HOVER";
    entity: Entity | null;
}>;
type ClearSelectionAction = Readonly<{
    type: "CLEAR_SELECTION";
}>;
type ClearHoverAction = Readonly<{
    type: "CLEAR_HOVER";
}>;
type ClearAllAction = Readonly<{
    type: "CLEAR_ALL";
}>;
/**
 * Discriminated union of all interaction actions.
 */
export type InteractionAction = Readonly<SelectAction | HoverAction | ClearSelectionAction | ClearHoverAction | ClearAllAction>;
/**
 * Pure reducer for map entity interaction state.
 *
 * - SELECT / HOVER replace the current selected/hovered entity (cross-layer).
 * - CLEAR_SELECTION / CLEAR_HOVER reset that specific field.
 * - CLEAR_ALL resets both to null.
 */
export declare const interactionReducer: (state: MapInteractionState, action: InteractionAction) => MapInteractionState;
export {};