/*** Helper functions - they are decoupled because of testability */
/**
 * @param {array} items
 * @param {number} indexFrom
 * @param {number} indexTo
 * @returns {array}
 */
export declare function swapArrayElements(items: any, indexFrom: any, indexTo: any): any;
/**
 * @param {number} mousePos
 * @param {number} elementPos
 * @param {number} elementSize
 * @param moveInMiddle
 * @returns {boolean}
 */
export declare function isMouseBeyond(mousePos: any, elementPos: any, elementSize: any, moveInMiddle: any): boolean;