Lazy Load NVM (node npm, npx, yarn)

.zshrc

load-nvmrc() {
  local node_version="$(nvm version)"
  local nvmrc_path="$(nvm_find_nvmrc)"

  if [ -n "$nvmrc_path" ]; then
    local nvmrc_node_version=$(nvm version "$(cat "${nvmrc_path}")")

    if [ "$nvmrc_node_version" = "N/A" ]; then
      nvm install
    elif [ "$nvmrc_node_version" != "$node_version" ]; then
      nvm use
    fi
  elif [ "$node_version" != "$(nvm version default)" ]; then
    echo "Reverting to nvm default version"
    nvm use default
  fi
}

lazy_load_nvm() {
  unset -f nvm node npm npx yarn
  export NVM_DIR=~/.nvm
  [ -s "$NVM_DIR/nvm.sh" ] && . "$NVM_DIR/nvm.sh" # This loads nvm
  load-nvmrc
  if [ -f "$NVM_DIR/bash_completion" ]; then
    [ -s "$NVM_DIR/bash_completion" ] && \. "$NVM_DIR/bash_completion" # This loads nvm bash_completion
  fi
}

nvm() {
  lazy_load_nvm
  nvm $@
}

node() {
  lazy_load_nvm
  node $@
}

npm() {
  lazy_load_nvm
  npm $@
}

npx() {
  lazy_load_nvm
  npx $@
}

yarn() {
  lazy_load_nvm
  yarn $@
}