usage of .nvmrc

.bash_profile

# To use this, add .nvmrc with contents of 'N.N.N'  to your project. e.g. 0.12.7
# Add the following to the end of .bash_profile or .bashrc
#
# if directory is changed 
#   if `.nvmrc` is found execute `nvm use`
#   if `package.json` is round execute `nvm use default`
enter_directory() {
  if [ "$PWD" != "$PREV_PWD" ]; then
    PREV_PWD="$PWD";
    if [ -e ".nvmrc" ]; then
      nvm use;
    elif [ -e "package.json" ]; then
      nvm use default
    fi
  fi
}
export PROMPT_COMMAND="$PROMP_COMMAND enter_directory;"