code: function freeze(object) {
    if (process.env.NODE_ENV === 'production') {
      return object
    }
  
    if (process.env.UPDEEP_MODE === 'dangerously_never_freeze') {
      return object
    }
  
    if (needsFreezing(object)) {
      recur(object)
    }
  
    return object
  }
docs: Deeply freeze a plain javascript object.
  
  If `process.env.NODE_ENV === 'production'`, this returns the original object
  without freezing.
  
  Or if `process.env.UPDEEP_MODE === 'dangerously_never_freeze'`, this returns the original object
  without freezing.
  
  @function
  @sig a -> a
  @param  {object} object Object to freeze.
  @return {object} Frozen object, unless in production, then the same object.