Is html.twig set by nvim? And what about syntax highlighting?

Edit: I am only able to find setf=twig https://github.com/neovim/neovim/blob/9ca313fb968448011aae0509e6552c52b9f8aa8c/runtime/filetype.vim#L2094

When I open twig files (without any plugins), neovim set html.twig as filetype. I can't find why looking at Nevim source code...
If I set twigas filetype in ft.lua, it doesn't work at all.

Currently, I use commentstring to make your plugin works on twig files.

Syntax highlight doesn't work without plugins in Neovim but I've made a PR that still not merged to implements treesitter for twig files.

When I open twig files (without any plugins), neovim set html.twig as filetype.

Interesting, can you try it with nvim --clean? I am just curious as I can't find any reference of html.twig source code and I certainly don't want to add wrong filetype. See #249 (comment)

Syntax highlight doesn't work without plugins in Neovim but I've made a PR that still not merged to implements treesitter for twig files.

Nice 👍

So, I checked it myself, by default nvim --clean foo.twig sets filetype to twig but there is no highlighting but setting html.twig I get highlighting only on html tags.

Left: set ft=twig | Right: set ft=html.twig

Thanks for the feedback, I've also checked and I found that it's vim-polyglot who set html.twig as filetype. I'll update my code tomorrow!