script.
  if (document.getElementsByClassName('mermaid').length) {
    if (window.mermaidJsLoad) mermaid.init()
    else {
      getScript('!{theme.CDN.mermaid}').then(() => {
        window.mermaidJsLoad = true
        mermaid.initialize({
          theme: '!{theme.mermaid.theme}',
        })
        !{theme.pjax.enable} && mermaid.init()
      })
    }
  }