Amazing! It worked!
For future NixOS and RStudio users, here’s what I ended up with in the environment.systemPackages =… part of my configuration.nix file (of course, your personal packages will vary depending on what you work with):
# List packages installed in system profile. To search, run:
# $ nix search wget
# let
# R-with-my-packages = rstudioWrapper.override{ packages = with rPackages; [ snakecase ]; };
# in
environment.systemPackages = with pkgs;
let
RStudio-with-my-packages = rstudioWrapper.override{
packages = with rPackages; [ tidyverse snakecase ]; };
in
[
neovim # Do not forget to add an editor to edit configuration.nix! The Nano editor is also installed by default.
RStudio-with-my-packages
other-programs-you-want-to-install
];
Thank you, @jbedo and @TLATER. I marked this as the solution so that the final result appears at the top, but as to credit, you two got me closer to the answer! I hope this way of marking a solution is okay. Otherwise please let me know 