React 16.4.1
Reflux 6.4.1
On components that extend Reflux.Component, if I use
static getDerivedStateFromProps(props, state) {...}
without implementing componentWillMount() (which is now UNSAFE in React), the Reflux functionality in the component fails, and I get a console error:

In the screenshot, below the error, I printed this.componentWillMount from the component's render() method, attesting it comes from the Reflux.Component implementation.
In summary, due to implementing a now UNSAFE componentWillMount(), Reflux.Component cannot be used with the new static method getDerivedStateFromProps().