import { ElementRef } from '@angular/core';
import { Observable } from 'rxjs';
import { FormGroup } from '@angular/forms';
export declare type JhiFileLoadErrorType = 'not.image' | 'could.not.extract';
export interface JhiFileLoadError {
    message: string;
    key: JhiFileLoadErrorType;
    params?: any;
}
/**
 * An utility service for data.
 */
export declare class JhiDataUtils {
    constructor();
    /**
     * Method to abbreviate the text given
     */
    abbreviate(text: string, append?: string): string;
    /**
     * Method to find the byte size of the string provides
     */
    byteSize(base64String: string): string;
    /**
     * Method to open file
     */
    openFile(contentType: string, data: string): void;
    /**
     * Method to convert the file to base64
     */
    toBase64(file: File, cb: Function): void;
    /**
     * Method to clear the input
     */
    clearInputImage(entity: any, elementRef: ElementRef, field: string, fieldContentType: string, idInput: string): void;
    /**
     * Sets the base 64 data & file type of the 1st file on the event (event.target.files[0]) in the passed entity object
     * and returns a promise.
     *
     * @param event the object containing the file (at event.target.files[0])
     * @param entity the object to set the file's 'base 64 data' and 'file type' on
     * @param field the field name to set the file's 'base 64 data' on
     * @param isImage boolean representing if the file represented by the event is an image
     * @returns a promise that resolves to the modified entity if operation is successful, otherwise rejects with an error message
     */
    setFileData(event: any, entity: any, field: string, isImage: boolean): Promise<any>;
    /**
     * Sets the base 64 data & file type of the 1st file on the event (event.target.files[0]) in the passed entity object
     * and returns an observable.
     *
     * @param event the object containing the file (at event.target.files[0])
     * @param editForm the form group where the input field is located
     * @param field the field name to set the file's 'base 64 data' on
     * @param isImage boolean representing if the file represented by the event is an image
     * @returns an observable that loads file to form field and completes if sussessful
     *          or returns error as JhiFileLoadError on failure
     */
    loadFileToForm(event: Event, editForm: FormGroup, field: string, isImage: boolean): Observable<void>;
    /**
     * Method to download file
     */
    downloadFile(contentType: string, data: string, fileName: string): void;
    private endsWith;
    private paddingSize;
    private size;
    private formatAsBytes;
}