Stands for Vim Elm Helper (yeah, that's cheap)
It's work in progress, for now it can install missing packages, but there is plan for more.
To install missing packages use ElmperInstallMissingPackages
command. It looks
for imports in current file and if package providing given module is not installed
it will try to install it. For example if you add import Mouse
in new elm
file
and run this command it will do elm-package install elm-lang/keyboard --yes
.