mkYarnRun.nix

_: {
  packages.mkYarnRun = {writeShellApplication}: {
    cache,
    unplugged,
    yarn,
    preRun,
    ...
  } @ opts: let
    setNodeOptions =
      if (builtins.hasAttr "nodeOptions" opts)
      then "export NODE_OPTIONS=\"${opts.nodeOptions}\""
      else "";
  in
    writeShellApplication {
      name = "yarn-run";
      runtimeInputs = [yarn];
      text = ''
        # Check and symlink cache directory
        CACHE_PATH=$(yarn config get cacheFolder)
        if [ ! -e "$CACHE_PATH" ]; then
          cp --reflink=auto --recursive ${cache} "$CACHE_PATH"
        fi

        # Check and symlink unplugged directory
        UNPLUGGED_PATH=$(yarn config get pnpUnpluggedFolder)
        if [ ! -e "$UNPLUGGED_PATH" ]; then
          cp --reflink=auto --recursive ${unplugged} "$UNPLUGGED_PATH"
        fi

        WORKSPACE_ROOT="$(dirname "$(dirname "$UNPLUGGED_PATH")")"

        ${setNodeOptions}

        ${preRun}

        ${yarn}/bin/yarn "$@"
      '';
    };
}