import { Operators } from '@loopback/filter';
import { ValueOf } from 'ts-essentials';
export type FieldOperators = Operators | '!' | '=' | '!=' | '<' | '<=' | '>' | '>=' | 'in' | 'not';
export declare const GroupOperators: string[];
export declare const Directives: {
    readonly EXPR: "$expr";
    readonly JOIN: "$join";
};
export type Directive = ValueOf<typeof Directives>;