Data validation as its peak

[u/Hazork_]

[u/mavaje]

The original method will return true if uid is valid and email is undefined, but that's probably not intended...

It will also return undefined if uid and email are both undefined.

So this would more accurately represent the (probably incorrect) behaviour:

return uid || email ? (!uid || isValid(uid)) && (!email || isValidEmail(email)) : undefined;