My definition of a TypeScript-friendly library:

I don’t have to “opt-in” to types. It’s automatic. I call APIs, enjoy rich autocomplete support, and get strongly typed responses back.

Thus, 3 smells:

1. Casting via “as”
2. Generic args
3. Having to remember to type something.

A couple more:

4. Types should be included. No separate install required.
5. Using the library with TS shouldn’t require checking the docs or Googling for tricks.

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