text: import { Line, mixins } from 'vue-chartjs'
  
  export default {
      name: 'line-chart',
          extends: Line,
          mixins: [mixins.reactiveProp],
          props: {
              extraOptions: Object
      },
      data() {
        return {
              ctx: null
          }
      },
      mounted() {
          this.$watch(
              'chartData',
              (newVal, oldVal) => {
              if (!oldVal) {
                  this.renderChart(
                    this.chartData,
                    this.extraOptions
                  )
              }
              },
              { immediate: true }
          )
      }
  }
  