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TypeScript. ( + ESLint, + Prettier ). It has made writing JavaScript tolerable. Classes as you expect them. With proper editor support, you get real errors, and the whole thing starts to feel more like writing code in python. It is no python, but at least it feels significantly less foreign. Its very progressive in the sense that regular JavaScript is valid TypeScript, and everything else is just a cherry on top. And it is easy to include the typing outside of the source file, so many libraries not written at all in TypeScript have typing support built in (likely by simple PRs from the community)