On Sat, Jan 29, 2022 at 5:24 PM H. Dieter Wilhelm <
dieter@duenenhof-wilhelm.de> wrote:

> Thanks, do you know what jannson is needed for?
>

It lets emacs do a bunch of JSON processing in C rather than elisp, which
is very helpful for a bunch of cases, especially some LSP modules.

Just in case: Language Server Protocol; a semi-standard way for outboard
toolsets like specialized compiler suites to communicate with editors
(primarily VSCode, but somewhat generalized and so supported in other
editors as well) about things like code completion and language-aware
editing. The protocol ends up being pretty chatty, often sending a lot of
json back and forth, and the pure-elisp method of converting it had a
pretty high overhead.

HtH,
~Chad