Css Zero Showcase
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<canvas style="max-block-size: 400px" aria-label="Example" role="img" data-controller="chart" data-chart-data-value="{"labels":["January","February","March","April"],"datasets":[{"label":"Line Dataset","type":"line","backgroundColor":"#fda4af","borderColor":"#fda4af","data":[30,30,30,30]},{"label":"Bar Dataset","type":"bar","backgroundColor":"#93c5fd","data":[10,20,30,40]}]}"></canvas>
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<% @chart_data = {
  labels: [ "January", "February", "March", "April" ],
  datasets: [
    { label: "Line Dataset", type: "line", backgroundColor: "#fda4af", borderColor: "#fda4af", data: [30, 30, 30, 30] },
    { label: "Bar Dataset",  type: "bar",  backgroundColor: "#93c5fd", data: [10, 20, 30, 40] }
  ]
} %>
<%= tag.canvas style: "max-block-size: 400px", aria: { label: "Example" }, role: "img", data: { controller: "chart", chart_data_value: @chart_data.to_json } %>
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://cdn.skypack.dev/chart.js@4.4.6?min"
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