import React from 'react';
import { DrawingID } from '@buerli.io/core';
export declare function isDegValue(expr: string): boolean;
export declare const NumOrExpr: React.FC<{
    drawingId: DrawingID;
    valOrExpr: number | string;
    onChange: any;
    defaults: number | string;
    angle?: boolean;
    allowExpr?: boolean;
    prefix?: string;
}>;