import * as ts from "typescript";
import { Constructor } from "./../../Constructor";
import { Node } from "./../common";
export declare type QuestionTokenableNodeExtensionType = Node<ts.Node & {
    questionToken?: ts.QuestionToken;
}>;
export interface QuestionTokenableNode {
    /**
     * If it has a question token.
     */
    hasQuestionToken(): boolean;
    /**
     * Gets the question token node or returns undefined if it doesn't exist.
     */
    getQuestionTokenNode(): Node<ts.QuestionToken> | undefined;
    /**
     * Gets the question token node or throws.
     */
    getQuestionTokenNodeOrThrow(): Node<ts.QuestionToken>;
    /**
     * Sets if this node is optional.
     * @param value - If optional or not.
     */
    setIsOptional(value: boolean): this;
}
export declare function QuestionTokenableNode<T extends Constructor<QuestionTokenableNodeExtensionType>>(Base: T): Constructor<QuestionTokenableNode> & T;