By default, the template engine used to render a file is decided according to
the file extension. For example, a .md file uses Markdown, .njk file uses
Nunjucks and so on.
You can override this default behaviour with the templateEngine option. Any
page having this variable will use it to decide the template engine, instead of
the extension.
The following example is a .md file but is configured to use Nunjucks to
render (instead of Markdown).
---
title: My post
templateEngine: njk
---
# Hello world
A typical example is a file using Markdown to render HTML but Nunjucks to insert variables or includes. To do that, you can use commas to add several engines:
---
title: My post
templateEngine: njk,md
---
# Hello, this is the post title {{ title }}
In the example above the page will be rendered using Nunjucks first and then Markdown.