There is a specification but it's fallen a bit behind the implementation. Of course the implementation is open source, pretty well documented and covered in lot

There is a specification but it's fallen a bit behind the implementation. Of course the implementation is open source, pretty well documented and covered in lots of tests. So, you could think of that as a living specification. Some pointers from this stackoverflow discussion: https://stackoverflow.com/questions/52148566/is-the-typescript-language-specification-document-up-to-date https://stackoverflow.com/questions/52148566/is-the-typescri...