import type { Checker } from 'estree-toolkit/dist/generated/is-type';
import type { Node } from 'estree-toolkit/dist/helpers';
/** A validator that returns `true` if the node is `null`. */
type NullableChecker<T extends Node> = (node: Node | null | undefined) => node is T | null;
/** Extends a validator to return `true` if the node is `null`. */
export declare function isNullableOf<T extends Node>(validator: Checker<T>): NullableChecker<T>;
export declare namespace isNullableOf {
    var __debugName: string;
}
export {};
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