Enum, namespace, type-oriented programming (e.g. https://type-level-typescript.com/ https://type-level-typescript.com/ ), easy de-sugaring down to earlier versi

Enum, namespace, type-oriented programming (e.g. https://type-level-typescript.com/ https://type-level-typescript.com/ ), easy de-sugaring down to earlier versions of ECMAScript (e.g. converting async-await to switch statements). Plus, whatever you can find under the "Reference" section: https://www.typescriptlang.org/docs/ https://www.typescriptlang.org/docs/