The w3c draft IDL defines the expected message for AbortError to be The operation was aborted. (https://heycam.github.io/webidl/#aborterror)

But this library uses a different string:

https://github.com/bitinn/node-fetch/blob/0c2294ec48fa5b84519f8bdd60f4e2672ebd9b06/src/index.js#L54

While node-fetch doesn't aim to replicate whatwg fetch in every aspect, this seems like an unnecessary divergence.