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This package makes it possible to use proselint with Emacs built-in Flymake.
flymake-proselint
is listed on GNU
ELPA, so you can use M-x list-packages
to install it.
Then you just need to activate it in the modes you want your prose to be checked with something like:
(add-hook 'text-mode-hook (lambda ()
(flymake-mode)
(flymake-proselint-setup)))