Basic yarn bash completion for commands and scripts (place file in /etc/bash_completion.d/)

yarn_completion

_yarn() {
  local cur prev commands scripts opts
  COMPREPLY=()
  cur="${COMP_WORDS[COMP_CWORD]}"
  prev="${COMP_WORDS[COMP_CWORD-1]}"

  commands="access add autoclean bin cache check config create exec generate-lock-entry global\
   help import info init install licenses link list login logout node outdated owner pack publish\
   remove run tag team unlink upgrade upgrade-interactive version versions why workspace workspaces"
  scripts=$(jq .scripts package.json | jq -r keys[])
  opts="$commands $scripts"

  [ "$prev" = "yarn" ] && { COMPREPLY=( $(compgen -W "${opts}" -- ${cur}) ); return 0; }
  [ "$prev" = "run" ] && { COMPREPLY=( $(compgen -W "${scripts}" -- ${cur}) ); return 0; }
}

complete -F _yarn yarn