export declare class DndUploadDirective {
    allowedExtensions: Array<string>;
    private filesChangeEmiter;
    private invalidFilesChangeEmiter;
    private defaultBackgroundColor;
    private dragOverBackgroundColor;
    background: string;
    constructor();
    onDragOver(event: any): void;
    onDragLeave(event: any): void;
    onDrop(event: any): void;
}