Re: JavaScript/TypeScript: What do people in 2024, on emacs 29, use for .js, .jsx, .ts and .tsx?

[Dmitry Gutov]

On 09/01/2024 14:12, Steinar Bang wrote:
> So I decided to see what came up as default on emacs 29.
>
> What I get according to 'C-h m', is:
>   The major mode is JavaScript[JSX] mode defined in js.el:
>
> JSX tag syntax seems to be highlighted correctly and indentations seems
> to be correct (I'm usinghttps://github.com/editorconfig/editorconfig-emacs  ).
>
> But there doesn't seem to be the same electric tag splitting behaviour I
> have on JSX mode...? Though that may be a configuration possibility...?
>
> What do others use?
>
> And what about typescript?
>
> I don't like typescript so I don't use that in any of my private
> projects, but when working with frontends I have to adapt.
>
> Last time I worked with typescript (2021-2022) I think I ended up with
> something called tide and web-mode for the .ts and .tsx files, while
> staying with rjsx-mode for .js and .jsx files.
>
> I don't know if that's still the way to go for typescript or if the
> built-in javascript mode now handles typescript?

js-mode handles JSX indeed, but it's inevitaby limited in what it 
understands about its syntax (it uses sgml-mode under the covers to do 
highlighting, but I'm sure there would be odd edge cases).

The latest new option in 29.1 is js-ts-mode (which uses tree-sitter 
parser and supports JSX too). It should provide the most accurate 
highlighting and reliable indentation, but some features (like tag 
splitting?) might have to be reimplemented anew. Should be easier to do 
that using tree-sitter parse tree than with sgml-mode. Perhaps if 
rjsx-mode has an implementation, it wouldn't be too hard to port it.