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Flymake Racket

Flymake extension for Racket.

Install

(use-package flymake-racket
  :ensure t
  :commands (flymake-racket-add-hook)
  :init
  (add-hook 'scheme-mode-hook #'flymake-racket-add-hook)
  (add-hook 'racket-mode-hook #'flymake-racket-add-hook))

Since I use both Emacs 25 and Emacs 26, I use flycheck-racket for Emacs 25 and flymake-racket for Emacs 26.

(defun +scheme-mode-setup-linting ()
  "Use `flymake' instead of `flycheck' in Emacs 26."
  (when (>= emacs-major-version 26)
    (flymake-mode)
    (flycheck-mode -1)))

(add-hook 'scheme-mode-hook #'+scheme-mode-setup-linting)
(add-hook 'racket-mode-hook #'+scheme-mode-setup-linting)

Differences to flycheck-racket

• More responsive, flycheck-racket seems to stall typing while it runs which prompted me to write flymake-racket.
• flycheck-racket only gives the error message and not the possible cause. flymake-racket explicitly looks for the possible cause: message.

See below for comparison:

Flymake:

Flycheck: