import { KeywordTypeNode, NullLiteral, SyntaxKind } from 'typescript';
import { AstNode } from './ast-node';
export declare class AstKeywordValue implements AstNode {
    node: KeywordTypeNode<SyntaxKind.UndefinedKeyword> | NullLiteral;
    constructor(node: KeywordTypeNode<SyntaxKind.UndefinedKeyword> | NullLiteral);
    get value(): null | undefined;
}