Flow type check

test.js

// @flow
import * as React from 'react';

type Props = {
  ...
}
  
class Foo extends React.Component<Props> {
  render() {
    return (
      <StyledComponent innerRef={scrollBody => (this.scrollBody = scrollBody)}>
        ...
      </StyledComponent>
    )
  }
}

export default Foo