export declare function blob2DataURL(blob: Blob): Promise<string>;
export declare function dataURItoBlob(dataURI: string): Blob;
export declare function openFile(accept?: string): Promise<File>;
export declare function openFiles(accept?: string): Promise<File[]>;
export declare function file2DataURL(f: File): Promise<string>;
export declare function getFormDataWithDataURLField(fileFieldName: string, fileDataURL: string, fileName?: string): FormData;
export declare function getFormDataWithBlobField(fileFieldName: string, fileBlob: Blob, fileName?: string): FormData;
export declare function getFormDataWithDataURLFields(fileFieldName: string, fileDataURLs: string[], fileNames: string[]): FormData;