import { AppSharedState } from '../state.models';
import { ActionMapLayerSetFeatureKey } from '../state.models.actions';
/**
 * Reducer to set the featureKey for a vector layer in a map's rendering layers.
 * Ensures that in state.selections there is an object with the same key as the renderingLayer (selectionKey).
 * If not, it creates it or updates the featureKeys array.
 *
 * @param {AppSharedState} state - The current application state.
 * @param {ActionMapLayerSetFeatureKey} action - The action containing mapKey, layerKey, featureKey, and optional customSelectionStyle.
 * @returns {AppSharedState} - The updated application state with the featureKey set for the specified layer.
 * @throws {Error} If the payload is missing or the map/layer is not found.
 */
export declare const reduceHandlerSetFeatureKeyInSelections: <T extends AppSharedState = AppSharedState>(state: T, action: ActionMapLayerSetFeatureKey) => T;