Mapped types on tuples and arrays Properties declarations on functions Version selection with typesVersions Matching behavior Multiple fields Mapped types on tuples and ar...
Improved behavior for calling union types Caveats Incremental file watching for composite projects in --build --watch Improved behavior for calling union types In prior vers...
Speed improvements Type-checking speed-ups --incremental improvements The Omit helper type Improved excess property checks in union types The --allowUmdGlobalAccess flag S...
Stricter Generators More Accurate Array Spread Improved UX Around Promises Better Unicode Support for Identifiers import.meta Support in SystemJS get and set Accessors Are ...
Protected Tuple types Protected The new protected modifier in classes works like it does in familiar languages like C++, C#, and Java. A protected member of a class is visib...
Null- and undefined-aware types --strictNullChecks Example Assigned-before-use checking Example Optional parameters and properties Non-null and non-undefined type guards Exam...