- [ ] `enter` should not be mandatory, instead one of `enter` or `leave` should be required. Second should be optional - [ ] Provide additional data to the `leave` signal, e.g. `props` and `children` - [ ] Anything else?
entershould not be mandatory, instead one ofenterorleaveshould be required. Second should be optionalleavesignal, e.g.propsandchildren