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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TypeScript 4.3

Today we’re excited to announce the availability of TypeScript 4.3! If you’re not yet familiar with TypeScript, it’s a language that builds on JavaScript by adding syntax for static types. Tools like the TypeScript compiler can just erase TypeScript synta... (more…)

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