{
  test: /\.js$/,
  loader: 'babel-loader',
  include: [
     resolve('src'),
     resolve ( 'node_modules / vue-echarts' ),
     resolve('node_modules/resize-detector')
   ] 
},

<template>
   <v-chart :options="polar"/>
</template>

<script>
import ECharts from 'vue-echarts/components/ECharts'
import 'echarts/lib/chart/line'
import 'echarts/lib/component/polar'

export default {
  components: {
    'v-chart' : ECharts
  },
  data: function () {
    let data = []
 
    for (let i = 0; i <= 360; i++) {
        let t = i / 180 * Math.PI
        let r = Math.sin(2 * t) * Math.cos(2 * t)
        data.push([r, i])
    }
 
    return {
      polar: {
        title: {
          text: 'Polar coordinate dual value axis'
        },
        legend: {
          data: ['line']
        },
        polar: {
          center: ['50%', '54%']
        },
        tooltip: {
          trigger: 'axis',
          axisPointer: {
            type: 'cross'
          }
        },
        angleAxis: {
          type: 'value',
          startAngle: 0
        },
        radiusAxis: {
          min: 0
        },
        series: [
          {
            coordinateSystem: 'polar',
            name: 'line',
            type: 'line',
            showSymbol: false,
            data: data
          }
        ],
        animationDuration: 2000
      }
    }
  }
}
</script>
<style scoped>
    .echarts {
        width: 100%;
        height: 400px;
    }
</style>