TypeScript: Mixin classes

This PR expands upon #13604 to add support for mixin classes and constructors. The PR includes type system support for the ECMAScript 2015 mixin class pattern described here and here as well as rul…

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Announcing TypeScript 3.8

Today we’re proud to release TypeScript 3.8! For those unfamiliar with TypeScript, it’s a language that adds syntax for types on top of JavaScript which can be analyzed through a process called static type-checking. This type-checking can tell us about er... (more…)

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