Chart.js in Vue2

Chart.vue

<template>
  <canvas ref="chart"></canvas>
</template>

<script>
  import chart from 'chart.js'

  export default {
    props: ['options', 'data'],

    mounted() {
      this.chart = new Chart(this.$refs.chart, this.options);
      this.refresh();
    },

    methods: {
      refresh() {
        if (!this.chart || !this.data) return;

        this.chart.config.data = this.data;
        this.chart.update();
      }
    },

    watch: {
      data() {
        this.refresh();
      }
    }
  }
</script>