Configuration Docs Do Not Reference `addTemplateFormats` API

[naomiyaki]

I wanted to add a couple of template formats to my build without effecting the defaults. Looks like there's a function that does just that, but it isn't in the docs anywhere!

https://github.com/11ty/11ty-website/blob/a5585afce586c9d9faed605a10fafab2feae5d70/src/docs/config.md?plain=1#L263

I couldn't find a precedent on this page for how an additional function would be added here, but if someone wants to provide guidance I'd be happy to write it up in a PR. Otherwise, go for it 💖

[Snapstromegon]

Hi @naomiyaki, seems like you're correct and this is not yet documented. Looking at the code (since I haven't used that function myself), it looks like it works like setTemplateFormats, but instead of replacing the existing template formats, it just adds them to the list.

So you'd call it as:

eleventyConfig.addTemplateFormats("myformat,other");
// or
eleventyConfig.addTemplateFormats(["myformat", "other"]);