hexo-theme-stellar/layout/mermaid.ejs

<% if (theme.plugins.mermaid.enable) { %>
  <script type="text/javascript" src="<%- theme.plugins.mermaid.js %>"></script>

  <script>
    var mermaid_config = {
      startOnLoad: true,
      theme:
        "<%- theme.style.darkmode %>" == "auto" &&
          window.matchMedia("(prefers-color-scheme: dark)").matches
          ? "dark"
          : "<%- theme.plugins.mermaid.theme %>",
      logLevel: 3,
      themeVariables: {
        darkMode: true
      },
      flowchart: {
        useMaxWidth: false,
        htmlLabels: true,
        curve: "linear"
      },
      gantt: {
        axisFormat: "%Y/%m/%d"
      },
      sequence: {
        actorMargin: 50
      }
    }
    if (window.mermaid) {
      mermaid.initialize(mermaid_config);
    }
  </script>
<% } %>