mylloon.fr/static/js/libs/mermaid.js

import mermaid from "https://cdn.jsdelivr.net/npm/mermaid@10/dist/mermaid.esm.min.mjs";

window.addEventListener("load", async () => {
  const theme = window.matchMedia("(prefers-color-scheme: dark)").matches
    ? "dark" // dark
    : "default"; // light

  mermaid.initialize({ startOnLoad: false, theme: theme });

  await mermaid.run({
    querySelector: ".language-mermaid",
  });
});