import * as Highcharts from 'highcharts' ; test_Tick ( ) ; function test_Tick ( ) { const chart = new Highcharts . Chart ( 'container' , { } ) ; const axis = new Highcharts . Axis ( chart , { } ) ; const tick = new Highcharts . Tick ( axis , 0 ) ; return ( tick . label instanceof Highcharts . SVGElement && tick . mark instanceof Highcharts . SVGElement ) ; }