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<div class="relative i-full" style="block-size: 400px;">
  <canvas aria-label="Example" role="img" data-controller="chart" data-chart-type-value="doughnut" data-chart-data-value="{"labels":["January","February","March","April"],"datasets":[{"label":"Dataset 1","backgroundColor":["#93c5fd","#fda4af","#6ee7b7","#c4b5fd"],"data":[70,40,80,25]}]}"></canvas>
</div>
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<% @chart_data = {
  labels: [ "January", "February", "March", "April" ],
  datasets: [{ label: "Dataset 1", backgroundColor: ["#93c5fd", "#fda4af", "#6ee7b7", "#c4b5fd"], data: [70, 40, 80, 25] }]
} %>
<div class="relative i-full" style="block-size: 400px;">
  <%= tag.canvas aria: { label: "Example" }, role: "img", data: { controller: "chart", chart_type_value: "doughnut", chart_data_value: @chart_data.to_json } %>
</div>
CSS is not required or multiple files are needed, check the notes.
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import { Controller } from "@hotwired/stimulus"
import { Chart, registerables } from "https://esm.sh/chart.js@4.4.9?standalone"
Chart.register(...registerables)
Chart.defaults.backgroundColor = getCssVariableValue("--color-primary")
Chart.defaults.borderColor = getCssVariableValue("--color-border")
Chart.defaults.color = getCssVariableValue("--color-text")
Chart.defaults.font.family = getCssVariableValue("--font-system-ui")
Chart.defaults.font.size = 12
function getCssVariableValue(variableName) {
  return getComputedStyle(document.documentElement).getPropertyValue(variableName).trim()
}
export default class extends Controller {
  static values = { type: { type: String, default: "line" }, data: Object, options: Object }
  connect() {
    this.chart = new Chart(this.element, this.#settings)
  }
  disconnect() {
    this.chart.destroy()
  }
  get #settings() {
    return { type: this.typeValue, data: this.dataValue, options: this.optionsValue }
  }
}

Dependencies