code: function delVars(origEnv, deleteVars) {
    var i;
    if (!Array.isArray(deleteVars))
      return;
    for (i = 0; i < deleteVars.length; i++) {
      if (!has(origEnv, deleteVars[i])) {
        origEnv[deleteVars[i]] = [
          !!has(process.env, deleteVars[i]),
          process.env[deleteVars[i]]
        ];
      }
      delete process.env[deleteVars[i]];
    }
    return;
  }
docs: remove vars from env
  @arg {Object} origEnv - place to save state of original env
  @arg {Array} deleteVars - names of env vars to remove from env
  @function