False positive getDefaultProps warning when mixing development and production versions

As migrating from 15.4 to 15.5, I am rewrite original react components with `create-react-class`. However, there is a warning. ``` react-15.5.4.js?bust=1497843639843:3287 Warning: getDefaultProps is only used on classic React.createClass definitions. Use a static property named `defaultProps` instead. ``` As I am really transferring from a **classic** `React.createClass` definition, I would like to ask is this warning appropriate? Or, this is a depreciation sames as the level of migrating to `create-react-class`? Ooops, I get ticket #9999 :D