code: func (c *SpacerComponent) MarshalJSON() ([]byte, error) {
  	return json.Marshal(&struct {
  		Type FlexComponentType  `json:"type"`
  		Size FlexSpacerSizeType `json:"size,omitempty"`
  	}{
  		Type: FlexComponentTypeSpacer,
  		Size: c.Size,
  	})
  }
docs: // MarshalJSON method of SpacerComponent