prettier-eslint for Emacs

prettier-eslint is a function that formats the current buffer using prettier-eslint-cli. The package also exports a minor mode that applies (prettier-eslint) on save.

Configuration

Requirements

(prettier-eslint) will only work on buffers attached to files that are part of a project that has the prettier-eslint-cli installed locally. This should be true if prettier-eslint-cli is included under dependencies or devDependencies in your project's package.json.

Basic configuration

Clone this repository.
Add the repository's path (e.g. ~/.emacs.d/prettier-eslint-emacs) to your load-path.

i.e. (add-to-list 'load-path "~/.emacs.d/prettier-eslint-emacs")

Require the package.

(require 'prettier-eslint)

Then you can hook to your favorite javascript mode:

(add-hook 'rjsx-mode-hook 'prettier-eslint-mode)
(add-hook 'js2-mode-hook 'prettier-eslint-mode)
...

prettier-eslint arguments

To adjust the CLI args used for the prettier-eslint command, you can customize the prettier-eslint-args variable:

(setq prettier-eslint-args '(
  "--trailing-comma" "all"
  "--bracket-spacing" "false"
))

Usage with web-mode

Web-mode is a popular mode for editing .js and .jsx files, but it is used to edit other template files too. If you want to hook prettier-eslint to web-mode for .js and .jsx files only, you can define a helper function like this:

(defun enable-minor-mode (my-pair)
  "Enable minor mode if filename match the regexp.  MY-PAIR is a cons cell (regexp . minor-mode)."
  (if (buffer-file-name)
      (if (string-match (car my-pair) buffer-file-name)
      (funcall (cdr my-pair)))))

And then hook to web-mode like this:

(add-hook 'web-mode-hook #'(lambda ()
                            (enable-minor-mode
                             '("\\.jsx?\\'" . prettier-eslint-mode))))

Customization

This package is customizable via custom.el:

M-x customize-group prettier-eslint

prettier-eslint-args are the args passed to the prettier-eslint command
prettier-eslint-show-errors customizes where to display the error output (buffer, echo or nil)