/nix-yarn-issue

yarn 1.x installed through nix issue (see issue)

Steps to reproduce

  1. make sure to install nixpkgs.yarn & nixpkgs.fnm (or nvm)
  2. Clone the repo
  3. Run fnm use --install-if-missing to install the version from .nvmrc file
  4. Validate that you get the correct version node -v & which node should point to the node coming from fnm
  5. Run yarn start, it shouldn't run & you will get this error
error nix-yarn-issue@1.0.0: The engine "node" is incompatible with this module. Expected version ">= 16". Got "14.18.1"
error Commands cannot run with an incompatible environment.
info Visit https://yarnpkg.com/en/docs/cli/run for documentation about this command.
  1. Run this command
yarn env | grep -E "\"(NODE|npm_node_execpath|npm_config_user_agent)\""

The output should look like this

"NODE": "/nix/store/d37aprv8pxqpslag1yq6n0q2q0fnpqwg-nodejs-14.18.1/bin/node",
"npm_node_execpath": "/nix/store/d37aprv8pxqpslag1yq6n0q2q0fnpqwg-nodejs-14.18.1/bin/node",
"npm_config_user_agent": "yarn/1.22.17 npm/? node/v14.18.1 darwin x64",

The problem is that nix sets the NODE environment variable to the nix node executable, which then yarn picks up and sets npm_node_execpath to the same value.

This problem doesn't happen if yarn is installed using homebrew or directly curl -o- -L https://yarnpkg.com/install.sh | bash.