import { AppSharedState } from '../state.models';
import { ActionMapLayerClearSelection } from '../state.models.actions';
/**
 * Reducer to atomically clear all feature keys from a map layer selection.
 *
 * Unlike dispatching MAP_LAYER_REMOVE_FEATURE_KEY N times (N state updates, N re-renders),
 * this wipes featureKeys and featureKeyColourIndexPairs in a single state update.
 *
 * @param {AppSharedState} state - The current application state.
 * @param {ActionMapLayerClearSelection} action - The action containing mapKey and layerKey.
 * @returns {AppSharedState} - Updated state with the selection cleared atomically.
 */
export declare const reduceHandlerClearLayerSelection: <T extends AppSharedState = AppSharedState>(state: T, action: ActionMapLayerClearSelection) => T;