import type { FieldInstance, FieldState, FNode, FormInstance, FormState } from '../interface';
declare class InstanceHelper {
    createInstance: <V>(initState: Partial<FieldState<V, any> | FormState<V, any>>, reducer?: <D>(s: Partial<FieldState<V, any> | FormState<V, any>>, data: D) => Partial<FieldState<V, any> | FormState<V, any>>, formInstance?: FormInstance<V, FormState<V, any>>, validParent?: FNode) => FormInstance<V, FormState<V, any>> | FieldInstance<V, FieldState<V, any>>;
    merge: <O extends Record<string, any>, S extends Record<string, any>>(target: O, source: S) => O;
    filterState: <P extends Record<string, any>>(props: P, keys: (string | number)[]) => Record<string, any>;
}
declare const _default: InstanceHelper;
export default _default;