import type { ILens } from '../../../libs/standard-lens';
import type { Comparer, EntityId, EntityState, IdSelector } from '../entity.types';
import type { EntityAdaptor } from './entity.types';
export declare type WithDefaultId = Record<'id', EntityId>;
export declare const defaultIdSelector: <T extends WithDefaultId>(item: T) => EntityId;
export interface CreateEntityAdaptorOptions<T, StateType> {
    /**
     * A function that can get an entityId out of the entity
     */
    idSelector: IdSelector<T>;
    /**
     * An optional comparison function that compares two entities for order. If this is not defined
     * order is not guaranteed
     */
    comparer?: Comparer<T>;
    /**
     * Optional lens that allows the adaptor to operate on larger data structures.
     */
    lens?: ILens<StateType, EntityState<T>>;
}
/**
 * Creates an entity adapter.
 *
 * @param options Options to create the entity adapter.
 * @return
 */
export declare const createEntityAdaptor: <T, StateTypeType>(options: CreateEntityAdaptorOptions<T, StateTypeType>) => EntityAdaptor<T, StateTypeType>;
/**
 * A constant that is a good initial state for any entity state.
 */
export declare const EMPTY_ENTITY_STATE: EntityState<never>;