[b3n]

> If anyone knows a quick fix, please let me know!

I don't use `use-package` (or `flycheck`, what advantage does it have over the built in `flymake`?), but I suspect adding `(require 'use-package)` after `(straight-use-package 'use-package)` would fix it.

[fovc]

Nowadays not too much. For a while flymake languished while flycheck got faster, more, robust, added languages, etc. Probably just a function of when op started using Emacs

[morelisp]

Note that "for a while" is in Emacs-time, so we're talking ~2013 to ~2019, i.e. longer than some entire popular editors, that flycheck was the normal way for someone using non-prerelease-Emacs.

(And even now I think I'd stick with flycheck if it weren't also for eglot using flymake by default.)