[Chartjs]-How to determine chart type inside 'chart.js' pluginservice

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According to the documentation you need to use Chart.plugins.register, not Chart.pluginService.register. Otherwise your code seems to work.

Here’s a working example:

Chart.plugins.register({
  beforeDraw: function(chart) {
    console.log(chart.config.type)
  }
});

new Chart(document.getElementById("chart"), {
  type: "doughnut"
});
<script src="https://cdnjs.cloudflare.com/ajax/libs/Chart.js/2.9.3/Chart.min.js"></script>
<canvas id="chart"></canvas>

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