import { KeyValue } from "@angular/common";
export type DragHandlerEvents = "dragstart" | "dragenter" | "dragleave" | "drop";
export type DragEventListener = (ev: DragEvent) => boolean | void;
export declare class DragDropHandler {
    protected el: HTMLElement;
    protected static handlers: Map<HTMLElement, DragDropHandler>;
    protected readonly onDragStart: DragEventListener;
    protected readonly onDragEnter: DragEventListener;
    protected readonly onDragOver: DragEventListener;
    protected readonly onDragLeave: DragEventListener;
    protected readonly onDrop: DragEventListener;
    protected first: boolean;
    protected second: boolean;
    protected dropEffect: "none" | "copy" | "link" | "move";
    protected effectAllowed: "none" | "copy" | "copyLink" | "copyMove" | "link" | "linkMove" | "move" | "all" | "uninitialized";
    protected listeners: Array<KeyValue<DragHandlerEvents, DragEventListener>>;
    static get(el: HTMLElement): DragDropHandler;
    protected static add(el: HTMLElement, inst: DragDropHandler): void;
    protected constructor(el: HTMLElement);
    addListener(key: DragHandlerEvents, value: DragEventListener): void;
    removeListener(type: DragHandlerEvents, listener: DragEventListener): void;
    protected fireEvent(type: DragHandlerEvents, ev: DragEvent): void;
    protected destroy(): void;
}