Next TypeScript release, due February 25, will support a limited form of checking against conditional and indexed acces types in return statements. Microsoft has moved TypeScript 5.8 into the beta ...

Compared to other programming languages which—with a few notable exceptions—feature nominal type systems, TypeScript features a structural one: As long as the shape of an object is equal or ...

Overall, the TypeScript 2.8 release has several improvements, most of which build upon the introduction of conditional types, improving the approach for expressing more complex type definitions.

The big new feature in TypeScript 2.8 is the support for conditional types, which borrows from JavaScript's familiar conditional -- or ternary operator, "?" -- that returns a different expression ...