import { OperatorFn } from './interfaces';
/**
 * Operator.
 */
export declare class Operator {
    constructor(name: string, fn: OperatorFn);
    /**
     * Operator name.
     */
    name: string;
    /**
     * Operator callback function.
     */
    fn: OperatorFn;
    /**
     * Use the provided callback function to evaluate to values.
     *
     * @param a Left side value.
     * @param b Right side value.
     */
    evaluate(a: any, b: any): boolean;
}