import { Type } from '@angular/core';
import { Operator } from '../models/operator/operator';
import { Operators } from '../models/operator/operators';
import * as i0 from "@angular/core";
/**
 * A service that resolves {@link Operators} (or custom string) into a concrete (@link Operator) implementation class.
 */
export declare class OperatorResolverService {
    /**
     * Resolves the operators in the {@link Operators} enum into their corresponding classes.
     * Passes all unresolved values into the [toCustomClass()]{@link OperatorResolverService#toCustomClass} method.
     * @param operator a serialized representation of the {@link Operator} class
     */
    toClass(operator: Operators | string): Type<Operator<any>> | undefined;
    /**
     * Should resolve any custom operators into their corresponding class objects.
     *
     * If you implement any custom {@link Operator} classes, you should override this method to resolve them after serialization.
     *
     * @param operator the serialized string provided by your [Operator.serialize()]{@link Operator#serialize} implementation
     * @returns `undefined`
     */
    protected toCustomClass(operator: string): Type<Operator<any>> | undefined;
    static ɵfac: i0.ɵɵFactoryDeclaration<OperatorResolverService, never>;
    static ɵprov: i0.ɵɵInjectableDeclaration<OperatorResolverService>;
}