Library versions of Map and Set doesn't implement @@toStringTag

[chicoxyzzy]

(new Map()).toString();
(new Set()).toString();

expected output:

[object Map]
[object Set]

actual output:

[object Object]
[object Object]

I've found this working on facebook/react#6780 (facebook/react#6780 (comment))

[zloirock]

Not exactly. @@toStringTag here available, but @@toStringTag behavior in Object#toString implemented only in global polyfill mode - we should not override built-ins in library version. I see only 2 possible solutions - override Object#toString in library version too or add own toString methods to Map, Set and other polyfilled built-in prototypes. Any ideas?

[chicoxyzzy]

What do you mean by own toString methods?

[zloirock]

I mean toString methods with @@toStringTag logic on Map, Set, etc prototypes in library version instead of patching Object#toString.

[chicoxyzzy]

In that case I think this is preferable and sufficient solution

[zloirock]

In v3 branch, they have own toString methods.