EOF newlines

All text files should end with a terminating newline. This is a rule defined in the POSIX standard.

image

Atom

The built-in package atom/whitespace takes care of this. Make sure it's enabled in your package settings. See this image for some recommended settings, which should already be default on new Atom installations.

VSCode

Add these settings to your configuration:

"files.trimTrailingWhitespace": true,
"files.insertFinalNewline": true,
"files.trimFinalNewlines": true

Vim

There's nothing to do here. It's enabled by default. To verify this, run :echo &fixeol and it should give you 1.

Spacemacs

This should be on for most file types in Spacemacs, but some file types don't have it, eg, .tool-versions and Dockerfile. Enable these settings in your Spacemacs config (usually ~/.spacemacs or ~/.spacemacs.d/init.el). Put them in the user-config section.

;; Under (defun docspacemacs/user-config ()...

  (setq
    mode-require-final-newline t
    require-final-newline t)