Right-hand side of 'instanceof' is not an object

I am trying to run this module but i am getting an error, Right-hand side of 'instanceof' is not an object and i had to remove this line to make it work again:

 if (target instanceof Date  || target instanceof Error) {
            throw new Error(`${target} found to be one of a on-observable types`);
}

[gullerya]

Closing this one, please reopen if any new info becomes available.

[gullerya]

Babel is a good place to look at - probably your transpilation target goes too far back or something like this.

Anyway, those lines are important 😃, so I’d suggest to have it working with them.

Let me know if you find anything or, please, close the issue if will become not relevant.