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re: TypeScript: type vs interface VIEW POST

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re: One more thing: as I said interface allows extension even after declaration, so it would be possible extend interface exposed by 3-rd party library...
 

There’s an example of the usefulness of this in a older than the current version of a functional programming library fp-ts.
It’s called declaration merging and it was used in that library, that implements higher kinded types, to extend those types.

 

Can you please point me to the code (link to the file/commit in github)? I want to understand it better

Yes, you can have a look here:
github.com/gcanti/fp-ts/tree/1.x

Has I explained this particular feature was used extensively in V1, but I think that is no longer the case due to the way the library is now structured.

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