TypeScript supports excess property checking in object literals, which detects ... provided properties belong to some union member and the appropriate type. TypeScript 3.5 improves union type ...

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 ...

The following example shows further capabilities of TypeScript ... For this, a union of string literal types can be created directly from Toy by using an index access type. Since the kind property ...

A union type works in the opposite direction. The following listing defines groups of people that may be encountered at a university. This example does not claim to be complete. TypeScript’s ...

This TypeScript 2.0 release candidate shows off a few new features, such as tagged unions and support for more literal types, and flexes itself beyond excludes in the config file with support for ...

the TypeScript definition of a "tuple-like type" is that it has a property called 0). I can now use this type definition to declare a variable and then load all the positions in that variable with ...

Arrived February 23, TypeScript 4.2 features enhancements pertaining to tuple types and type aliases. TypeScript 4.2 expands the ways rest elements in tuple types can be used.