/**
 * eval2("+10", { L: 100 }, "L")
 * @param expr
 * @param [params]
 * @param [defaultParam] 当输入 +10 这样的表达式时,设置默认的操作变量
 * @returns 计算结果
 */
export declare function eval2(expr: string, params?: {}, defaultParam?: string): number;
export declare function safeEval(expr: string, params?: {}, defaultParam?: string): number;
export declare function CheckExpr(expr: string, params: any): {
    res: any;
    error: any;
};
/**解析大括号内的表达式 */
export declare function ParseExpr(expr: string, fractionDigits?: number, params?: {}): string;
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