import type { PageTreeDoc } from './pageTree.js';
export declare const CANCEL_DRAG_MESSAGE = "Release to cancel drag.";
export type PageTreeDropValidation = {
    isValid: boolean;
    message?: string;
    parentID: null | string;
};
export declare function getDropValidation(args: {
    activeDoc: PageTreeDoc;
    targetDoc?: PageTreeDoc;
}): PageTreeDropValidation;