Its a Custom Web Component. Do not use the constructor directly with the new keyword. Instead, use one of the 3 following methods:

Create the Web Component and call its init method:

const myChart = document.createElement("a-chart").init(config)

Or use the shorthand for it:

const myChart = createChart({
 chartType: "bar",
 data: {...},
 options: {...},
 width: 300,
 height: 200
})

myChart.render()

Or directly declare the config inside a container component:

const myPanel = createPanel({
  title: "My panel",
  items: [
      {
         type: "chart",
         chartType: "bar",
         data: {...},
         options: {...},
         width: 300,
         height: 200
      }
  ]
})
myPanel.render()