Nix-shell: How to run `corepack enable` to install modern Yarn?

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This confused me as well at first, but then I read in the Yarn docs that recent versions of Yarn 1.x can install newer versions itself. So that might be a reason why there is only the 1.x package in nixpkgs.

Anyway, here’s what works for me in shell.nix:

let
  pkgs = import (fetchTarball https://channels.nixos.org/nixpkgs-22.11-darwin/nixexprs.tar.xz) {};
  nodejs = pkgs.nodejs-16_x;
  yarn = pkgs.yarn.override { inherit nodejs; };

in pkgs.mkShell {
  buildInputs = [
    nodejs
    yarn
  ];

  shellHook = ''
    yarn set version 3.x
  '';
}