import Primitive from './primitive';
import Optional from './optional';
import type { NullState } from '../types';
declare class Null extends Primitive<null, null, NullState<null, null>> {
    filter(value: unknown, defaultable: false, quiet: true): boolean;
    filter(value: unknown, defaultable?: boolean, quiet?: false): null;
    filter(value: unknown, defaultable?: boolean, quiet?: boolean): null | boolean;
    test(value: unknown): value is null;
    optional(): Optional<null>;
}
export default Null;