import { Toolbar } from '@jupyterlab/apputils' ; import { PanelLayout , Widget } from '@lumino/widgets' ; /**
 * The header for a Breakpoints Panel.
 */ export class BreakpointsHeader extends Widget { /**
     * Instantiate a new BreakpointsHeader.
     */ constructor ( ) { super ( { node : document . createElement ( 'header' ) } ) ; const title = new Widget ( { node : document . createElement ( 'h2' ) } ) ; title . node . textContent = 'Breakpoints' ; const layout = new PanelLayout ( ) ; layout . addWidget ( title ) ; layout . addWidget ( this . toolbar ) ; this . layout = layout ; } /**
     * The toolbar for the breakpoints header.
     */ readonly toolbar = new Toolbar ( ) ; }