How to source init.lua without restarting neovim

Is there a clean way to reload a neovim init.lua config and all its modules without restarting neovim?

I've read on another post that :luafile $MYVIMRC was supposed to accomplish just that but it doesn't seem to work for me unfortunately. Here's how it's being added to my config, as a keymap in this case.

local opts = { noremap = true, silent = true }vim.api.nvim_set_keymap("n", "<leader><CR>", ":luafile $MYVIMRC<CR>", opts)

I'm on nvim v0.8.0.