An error occuren when merge axios config: config.signal.addEventListener is not a function about deepmerge

[RebeccaStevens]

This library can't merge non-basic objects out of the box.
See https://github.com/TehShrike/deepmerge#ismergeableobject

[ZLY201]

I found this in the source code:

function getKeys(target) {
	return Object.keys(target).concat(getEnumerableOwnPropertySymbols(target))
}

and something will be wrong with Object.keys

Object.keys(controller.signal)      // []

but for...in works fine

for (const key in controller.signal) {
    console.log(key);
}
/*
aborted
reason
onabort
throwIfAborted
addEventListener
dispatchEvent
removeEventListener
*/

May be should change to use for...in?

[RebeccaStevens]

There are a few reason why for..in is a bad approach so I don't see that changing.

If you want a more modern version of this library, check out https://github.com/RebeccaStevens/deepmerge-ts