It should be no different from Vim. Namely,
source $MYVIMRC
In nvim help :h vimrc
describes how the associated file is (still) referred to as a "vimrc" (or "config file") and just below that (:h $MYVIMRC
) you'll see how/when the environment variable $MYVIMRC
is assigned, i.e. during startup nvim looks for config in four places (vs five for vim) and the path of the first one found is assigned to $MYVIMRC
.
(Usually that means your personal init.vim file but if that's not happening you can read that section and see if you're configured to pick up one of the other three locations.)
FYI, for both Vim and Neovim I use
nnoremap <leader>sv :source $MYVIMRC<CR>
as a handy shortcut (sv
for "source vimrc").