code: function replace_env_values(val_in) {
    if (!val_in)
      return ""
  
    let val_out = val_in
  
    const matches = val_in.match(/\$\w+/g)
      
    if (matches)
      matches.forEach(env => {
        const value = process.env[env.substring(1, env.length)]
      val_out = value.replace(new RegExp(`${env}`, "g"), value) // eslint-disable-line
      })
  
    return val_out
  }
docs: Replace any environmentals that appear in the
  string.
  @param  {string} val_in to do replace on.
  @return {string} String with replacements done.