Make sure you can run credo from command line.
Add credo dependency to mix.exs:
defp deps do
[
{:credo, "~> 1.4", only: [:dev, :test], runtime: false}
]
download and run credo:
mix deps.get
mix credo
My emacs setup works fine:
(use-package elixir-mode)
(use-package alchemist-mode
:ensure alchemist
:hook elixir-mode
:bind (:map elixir-mode-map
("s-c" . alchemist-iex-compile-this-buffer)
("C-c C-l" . alchemist-iex-project-run)))
(use-package company
:init
(add-hook 'elixir-mode-hook 'company-mode)
:bind (:map elixir-mode-map
("TAB" . company-indent-or-complete-common)))
(use-package flycheck-mode
:hook elixir-mode
:ensure flycheck
:config
(use-package flycheck-credo)
(flycheck-credo-setup))
Also you could try M-x flycheck-verify-setup
It should print something like:
First checker to run:
elixir-credo
- may enable: yes
- executable: Found at /Users/maris/.kiex/elixirs/elixir-1.10.3/bin/mix
