It varies widely by org. TypeScript is intentionally designed to accommodate as wide a swath of styles as possible (even to a point where some functionality is

It varies widely by org. TypeScript is intentionally designed to accommodate as wide a swath of styles as possible (even to a point where some functionality is duplicated: you can have enums or string unions, you can have interfaces or object types, etc). TypeScript code can be written squarely in a C# developer's comfort zone (unsurprising, given it's developed by Microsoft), or it can be a richly expressive and flexible immutable/functional/structural type system. It's similar to what I've heard Scala described as (though I haven't used that myself). In some cases though this is a strength: I usually to stick to a functional style where I can, but end up with a handful of classes where they make sense. Being able to mix the two smoothly is nice.