node-bin.plugin.zsh

# Add node_modules/.bin to path.
function _node_bin() {
  path=( ${path[@]:#*node_modules*} )
  local p="$(pwd)"
  while [[ "$p" != '/' ]]; do
    if [[ -d "$p/node_modules/.bin" ]]; then
      path+=("$p/node_modules/.bin")
    fi
    p="$(dirname "$p")"
  done
  typeset -U path
}

precmd_functions+=(_node_bin)