import { HttpEvent } from '@angular/common/http';
import { MonoTypeOperatorFunction, Observable, UnaryFunction } from 'rxjs';
/**
 *
 * @example
 *
 *  this.http.post(url, toFormData(this.form.value), {
 *     reportProgress: true,
 *     observe: 'events'
 *   }).pipe(
 *    uploadProgress(progress => (this.progress = progress)),
 *    toResponseBody()
 *  )
 *
 */
export declare function toFormData<T>(formValue: T, options?: {
    multiFileKey?: string;
}): FormData;
export declare function uploadProgress<T>(cb: (progress: number) => void): MonoTypeOperatorFunction<HttpEvent<T>>;
export declare function toResponseBody<T>(): UnaryFunction<Observable<HttpEvent<T>>, Observable<T>>;