[Chartjs]-How to create a gradient fill line chart in latest Chart JS version (3.3.2)?

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You where almost there, in v3 by default line charts dont fill so you will need to set fill: true

Example

    var ctx = document.getElementById('chart').getContext('2d');

    var gradient = ctx.createLinearGradient(0, 0, 0, 300);
    gradient.addColorStop(0, 'rgba(224, 195, 155, 1)');
    gradient.addColorStop(1, 'rgba(100, 100, 0,0)');

    var myChart = new Chart(ctx, {
      type: 'line',
      data: {
        labels: ['Red', 'Blue', 'Yellow', 'Green', 'Purple', 'Orange'],
        datasets: [{
          backgroundColor: gradient,
          label: 'Numbers',
          fill: true,
          data: [12, 19, 3, 5, 2, 3],
        }]
      },
      options: {
        scales: {
          y: {
            beginAtZero: true
          }
        },
        tension: 0.3
      }
    });
<script src="https://cdn.jsdelivr.net/npm/chart.js@3.3.2/dist/chart.min.js"></script>
<canvas id="chart" width="800" height="400"></canvas>

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