/**
 * 1. mouse enter into block (including safe area and block itself), side bar should display on
 *    current block. when mouse position do not belong to any block, side bar will be put by the
 *    side of block where selection exist.
 * 2. If side bar display, only if you begin to typing characters it will disappear.
 *    1. select text in same block will not trigger its disappear
 *    2. select text range including other block, it will make sidebar appear on other block's heading.
 *    3. click a position will not trigger its disappear
 * 3. when typing or enter into new line, sidebar should not display...
 * 4. when hover on a image, how to handle imageBar and sidebar
 *
 * The reason why sidebar should be created every times...
 * 1. An attempt to create a top level Sidebar component, but when fulfill drag functionality,
 *    It has big trouble...How could i set `draggable` attribute and drag the related block, it means
 *    sidebar trigger setting block as `draggable` and trigger related block to move. So it'd better make
 *    sidebar belong to block.
 */
import './styles.css';
declare function SidebarPlugin(): void;
export default SidebarPlugin;