import { HttpParams } from '@angular/common/http';
export declare class HttpParamsBuilder {
    private _params;
    constructor(params?: HttpParams);
    static fromHttpParams(httpParams: HttpParams): HttpParamsBuilder;
    static fromKeyValue(params: {
        [key: string]: string | string[];
    }): HttpParamsBuilder;
    static fromObject<T>(object: T): HttpParamsBuilder;
    private static addParam;
    append(key: string, value: any): HttpParamsBuilder;
    appendAll(key: string, value: string[]): HttpParamsBuilder;
    appendHttpParams(httpParams: HttpParams): HttpParamsBuilder;
    build(): HttpParams;
    readonly params: HttpParams;
    private static validateArgs;
}