(deftask dev []
  (comp
    (reload)
    (cljs)))

or reload and cljs for that matter

Yes

https://github.com/guns/vim-clojure-highlight

Though to get it working for boot, you might need to set a var

On mobile, so can't link, but it's in my .files on github if you feel like digging. It's to do with setting a buffer local in build.boot files

I wasn’t able to get it working with boot

this looks like relevant code

if expand('%:t') == 'build.boot'
  let b:fireplace_ns = 'boot.user'
endif

in your dotfiles

thanks anyway @dominicm you’re always so helpful! At least the plugin works for standard clojure code