/** Creates an element that will be shown instead of the current element while dragging. */
export declare function createPlaceholderElement(rootElement: any): HTMLElement;
/**
 * @license
 * Copyright Google LLC All Rights Reserved.
 *
 * Use of this source code is governed by an MIT-style license that can be
 * found in the LICENSE file at https://angular.io/license
 */
/** Gets a mutable version of an element's bounding `ClientRect`. */
export declare function getMutableClientRect(element: Element): ClientRect;
/**
 * Updates the top/left positions of a `ClientRect`, as well as their bottom/right counterparts.
 * @param clientRect `ClientRect` that should be updated.
 * @param top Amount to add to the `top` position.
 * @param left Amount to add to the `left` position.
 */
export declare function adjustClientRect(clientRect: {
    top: number;
    bottom: number;
    left: number;
    right: number;
    width: number;
    height: number;
}, top: number, left: number): void;
/** Inline styles to be set as `!important` while dragging. */
export declare const dragImportantProperties: Set<string>;
/**
 * Matches the target element's size to the source's size.
 * @param target Element that needs to be resized.
 * @param sourceRect Dimensions of the source element.
 */
export declare function matchElementSize(target: HTMLElement, sourceRect: ClientRect): void;
