hexo-theme-stellar/layout/_partial/plugins/parser/script.ejs

<% if (page.katex == true) { %>
  <%- partial('katex/script') %>
<% } %>
<% if (page.mathjax == true) { %>
  <%- partial('mathjax/script') %>
<% } %>
<% if (page.mermaid == true) { %>
  <%- partial('mermaid/script') %>
<% } %>