Как highcharts заставить выдавать картинки в ответе на сервере node.js?

Question

[vitas2008]

Код контроллера:

const fs = require('fs')
const exporter = require('highcharts-export-server')

class ChartsService {
  async getCharts(chart, title, xAxis, yAxis, series) {
    let chartOptions = {
      chart: {
          type: 'bar'
      },
      title: {
          text: 'Historic World Population by Region'
      },
      subtitle: {
          text: 'Source: Our Code World'
      },
      xAxis: {
          categories: ['Africa', 'America', 'Asia', 'Europe', 'Oceania'],
          title: {
              text: null
          }
      },
      yAxis: {
          min: 0,
          title: {
              text: 'Population (millions)',
              align: 'high'
          },
          labels: {
              overflow: 'justify'
          }
      },
      tooltip: {
          valueSuffix: ' millions'
      },
      plotOptions: {
          bar: {
              dataLabels: {
                  enabled: true
              }
          }
      },
      legend: {
          layout: 'vertical',
          align: 'right',
          verticalAlign: 'top',
          x: -40,
          y: 80,
          floating: true,
          borderWidth: 1,
          backgroundColor: '#FFFFFF',
          shadow: true
      },
      credits: {
          enabled: false
      },
      series: [{
          name: 'Year 1800',
          data: [107, 31, 635, 203, 2]
      }, {
          name: 'Year 1900',
          data: [133, 156, 947, 408, 6]
      }, {
          name: 'Year 2000',
          data: [814, 841, 3714, 727, 31]
      }, {
          name: 'Year 2016',
          data: [1216, 1001, 4436, 738, 40]
      }]
  };

    exporter.initPool()

    let html = await new Promise((resolve, reject) => {
      exporter.export({type: "png", options: chartOptions}, (err, res) => {
        if (err) {
          reject(err)
        } else {
          const img = `<div><img src="data:image/png;base64,${res.data}" /></div>`
          resolve(img)
        }
        exporter.killPool()
      })
    })
    return html
  }
}

module.exports = new ChartsService()

ответом получаю

глобально highcharts-export-server ставил, лицензия true, build.js запускал.(