The major difference between functions in TypeScript/JavaScript and other languages is that, in TypeScript/JavaScript, a function is just something that a variable can hold.

Using generics in TypeScript is very similar to using them in, for example, C#. This method calls a generic function, specifying the data type to be used (string, in this case): res = ...

Now available as a production release, TypeScript 4.2 loosens restrictions on rest elements in tuple types and improves type alias preservation.

Next TypeScript release, due February 25, will support a limited form of checking against conditional and indexed acces types in return statements.