import type { AbstractMixable, AnyValue, NullableCallback } from '../Contracts';
declare const _default: <T extends AbstractMixable = AbstractMixable>(Parent: T) => (abstract new (...args: import("../Contracts").Args) => {
    /**
     * Indicates if the field is nullable.
     */
    acceptsNullValues: boolean;
    /**
     * Values which will be replaced to null.
     */
    nullValidator: NullableCallback;
    /**
     * Indicate that the field should be nullable.
     */
    nullable(nullable?: boolean, validator?: NullableCallback): any;
    /**
     * Specify nullable values.
     */
    nullValues(nullValidator: NullableCallback): any;
    /**
     * Determine if the field supports null values.
     */
    isNullable(): boolean;
    /**
     * Determine if the given value is considered a valid null value if the field supports them.
     */
    isValidNullValue(value: AnyValue): boolean;
    /**
     * Determine if the given value is considered null.
     */
    valueIsConsideredNull(value: AnyValue): boolean;
}) & T;
export default _default;