Decorators haven't been adopted because they are not specced or shipped. There is no decorator feature in the ES7 (ES2016) spec. However, there is a proposal

Decorators haven't been adopted because they are not specced or shipped. There is no decorator feature in the ES7 (ES2016) spec. However, there is a proposal for decorators that it is not finalized yet. https://github.com/tc39/proposal-decorators https://github.com/tc39/proposal-decorators