change envs on the fly

.zshrc

# USAGE: 
#   production node -e 'console.log(process.env.HELLO)'
#   staging node -e 'console.log(process.env.HELLO)'
#

production() {
  NODE_ENV=production \
  HELLO=world \
  FOO=bar \
  $*
}

staging() {
  HELLO=hi \
  FOO=baz \
  $*
}