import { TQueryValue } from "../../types";
import { QueryUnit } from "../queryable/QueryUnit";
import { QueryHelper } from "../query-builder/QueryHelper";
import { TEntityValue } from "../queryable/types";
export declare class CaseWhenQueryHelper<T extends TQueryValue> {
    private readonly _qh;
    private readonly _arg;
    private readonly _cases;
    private _type;
    constructor(_qh: QueryHelper, _arg: TEntityValue<TQueryValue>);
    when(arg: TEntityValue<TQueryValue>, then: TEntityValue<T>): CaseWhenQueryHelper<T>;
    else(then: TEntityValue<T>): QueryUnit<T>;
}