Removes React.PropTypes and attempts to transform to Flow.
npm install -g jscodeshiftgit clone https://github.com/billyvg/codemod-proptypes-to-flowjscodeshift -t codemod-proptypes-to-flow/src/index.js <path>- Use the 
-doption for a dry-run and use-pto print the output for comparison 
Behavior of this codemod can be customized by passing options to jscodeshift e.g.:
jscodeshift -t codemod-proptypes-to-flow/src/index.js --flowComment=line <path>
Following options are accepted:
--flowComment=<block|line> - type of flow comment. Defaults to block.
--flowComment=block:  /* @flow */
--flowComment=line:   // @flow
--propsTypeSuffix=<suffix> - used to customize the type names generated by the codemod. Provided string will be used alone or appended to Component's name when defining props type. Defaults to Props.
Default:
type Props = {...}
type MyComponentProps = {...}
With --propsTypeSuffix=PropsType:
type PropsType = {...}
type MyComponentPropsType = {...}
- Custom validators
 React.createClass- Use of importing PropTypes
 
- Thanks to @skovhus for adding support for functional components and modernizing the codebase a bit (a lot)