import 'reflect-metadata';
import { HeaderValue, RestAdvParam } from '../models';
import RESTClient from '../rest-client';
import MethodFactory from '../utils/method-factory';
export declare function getUnionMeta(builder: RequestBuilder, key: string, ...subKeys: string[]): any;
export default class RequestBuilder {
    readonly instance: RESTClient;
    readonly propertyKey: string;
    readonly args: any[];
    readonly factory: MethodFactory;
    readonly authentication: any;
    readonly defaultHeaders: Promise<Record<string, HeaderValue>>;
    constructor(instance: RESTClient, propertyKey: string, args: any[], factory: MethodFactory);
    buildHeader(): Promise<any>;
    getParamValue({ parameterIndex, defaultValue }: RestAdvParam): any;
}