As far as I know the only way to disable React PropType validation is to uglify React with
Short answer: There is no simple flag to disable only PropType validation
Currently, PropType validation is enabled by
__DEV__ global variable.
If it's changed to false, you will lose other React warnings and errors that, as you said, you can't.
This code here in ReactDOMFactories shows how
ReactElement factories are chosen to define how an element creation will work.
I'm not sure how this information can help you but at least shows that there is no simple way to disable PropType by a flag as you wondered.