import { Selector } from "./Selector";
import { ExprDesc } from "./ExprDesc";
import { KeyDesc } from "./KeyDesc";
export declare class OpDesc extends ExprDesc {
    readonly type: string;
    _key: string | KeyDesc;
    value: Selector;
    constructor(key: string | KeyDesc, value: Selector);
    get key(): string;
    isOp(): boolean;
    isGroup(): boolean;
}