web/_includes/js-selector.html

<!--
  JS selector for site.
  Chirpy v2.3
  https://github.com/cotes2020/jekyll-theme-chirpy
  © 2020 Cotes Chung
  MIT Licensed
-->

{% if page.layout == 'home' or page.layout == 'post' or page.layout == 'categories' %}
  {% assign js = page.layout %}
{% else %}
  {% assign js = "page" %}
{% endif %}

{% assign js_src = js | prepend: '/assets/js/' | append: '.min.js' | relative_url %}

<script async src="{{ js_src }}"></script>

{% if page.math %}
  <!-- MathJax -->
  <script src="https://polyfill.io/v3/polyfill.min.js?features=es6"></script>
  <script async src="https://cdn.jsdelivr.net/npm/mathjax@3/es5/tex-mml-chtml.js"></script>
{% endif %}

{% if jekyll.environment == 'production' %}
  <!-- PWA -->
  <script defer src="{{ '/app.js' | relative_url }}"></script>
{% endif %}