import { Node, NodeOptions, NodeState } from 'flow-connect/core';
import { Evaluator } from 'flow-connect/utils';
import { Input, Button } from 'flow-connect/ui';
export interface FuncState extends NodeState {
    newVar: string;
    expression: string;
}
export declare class Func extends Node<FuncState> {
    addVarButton: Button;
    evaluator: Evaluator;
    static DefaultState: (exp: string) => FuncState;
    constructor();
    setupIO(options: FuncOptions): void;
    protected created(options: FuncOptions): void;
    protected process(): void;
    parseExpression(expression: string): void;
    lowerCase(input: Input): void;
    setupUI(): void;
    setupListeners(): void;
}
export interface FuncOptions extends NodeOptions {
    expression?: string;
}