Not sure if it's still true, last time I checked TypeScript it's not compatible ...

issaria on March 16, 2016 | parent | context | favorite | on: JavaScript libraries should be written in TypeScri...

Not sure if it's still true, last time I checked TypeScript it's not compatible with ES2015 as babel does, so I chose babel instead. It's good to have type safety, but there is also flowtype.