React es6 syntax

Question

What does this syntax mean?

this part : $FlowFixMeProps, $FlowFixMeState

class Tester extends React.Component<$FlowFixMeProps, $FlowFixMeState> {
...
}

Thanks,

Answer 1

Looks like it's from the type checking library FlowJS.

See: https://flow.org/en/docs/react/components/

Answer 2

This syntax looks like typescript to me.

The $FlowFixMeProps is the class of your react component's props and $FlowFixMeState is the class of your react component's the state.

An example of using typescript with react is here . You can maybe find more information of how this react/ts combination can work.