- [ ] Flow - https://github.com/facebook/flow/issues/6605 - [ ] Webstorm - https://youtrack.jetbrains.com/issue/WEB-35752 - [ ] Babel - https://github.com/babel/proposals/issues/23 [See all proposals](https://github.com/tc39/proposals/issues/140)
