What is Flow?
What is TypeScript?
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Typescript has been a win because, in general, it makes codebase maintenance less brittle. It's significantly easier to refactor in TS than JS, which encourages incremental improvements, file re-organizing, etc. Our developers are happier with the overall development experience.
The downside is that TS sometimes exacerbates problems caused by Node's fragmented ecosystem. Sometimes @types/
If your project is big enough, I'd say TS is nearly always worth it, but it can make selecting libraries a pain.
Used for Node.js personal projects that I think will have a longer lifetime than others, or that are combined with a web front end component like Angular (to share types).
Generally a poor developer experience. Usage decreasing recently compared to other preferred programming languages/platforms.
TypeScript is used in Kuro (https://github.com/Marc3842h/kuro).
Excellent design-time type checking and the ability for the Typescript compiler to attach typing information to metadata at compile time allows for relatively simple type checking at run-time as well.
We, our team can sleep comfortable at night know "x is undefined" will not occur in production. It's also really helpful as IDE help in code completion when they know types.