Add binaries installed via yarn to the $PATH

config.fish

function __update_yarn_bin --on-variable PWD
  if ! set -qg FISH_YARN_BIN
    set -g FISH_YARN_BIN (mktemp -d -t fish-yarn-bin-XXX)
    set PATH $FISH_YARN_BIN $PATH
  end

  set -l bins (begin yarn bin --json; or true; end | jq -r .name)

  for file in $bins
    if ! test -f $FISH_YARN_BIN/$file -o $file = null
      echo -e "#!/usr/bin/env bash\nexec yarn run -B $file \"\$@\"" >$FISH_YARN_BIN/$file
      chmod +x $FISH_YARN_BIN/$file
    end
  end

  for file in $FISH_YARN_BIN/*
    if ! contains (basename $file) $bins
      rm $file
    end
  end
end

__update_yarn_bin

Yarn binaries in FISH.md

Add this script to your fish config.

It sets up a listener. Every time the working directory changes, it checks what binaries are installed and accessible via yarn 2, and makes those accessible on the PATH.

In other words, if you've got a yarn 2 workspace you can run

yarn add -D typescript
tsc --init

instead of

yarn add -D typescript
yarn tsc --init

These binaries are available in your shell but also in other processes, making it possible to e.g. run

git ls-files | xargs prettier --write