The payload typechecking does conform to React's PropType standard though. If you don't want to require React for that to work you can grab a standalone PropType library. There are a few available:

https://www.npmjs.com/package/react-immutable-proptypes https://www.npmjs.com/package/react-prop-types

Nope, this is just another way to define Redux reducers. It's compatible with anything Redux is compatible with :)