How to source init.lua without restarting neovim

Is there a clean way to reload a neovim init.lua config and all its modules (using the require() function) without restarting neovim?

I've read on another post that :luafile $MYVIMRC was supposed to accomplish just that but it doesn't reload those cached file unfortunately. I'm hoping to setup a keymap like I used to have in my previous init.vim config. Something along the lines of:

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.