SinonJS stub getter defined with configurable false

Question

I'm trying to stub nodeJS auth0 lib ManagementClient.prototype.createUser using SinonJS .

The problem is that createUser is a getter defined with Object.defineProperty using configurable: false hence using sinon.replaceGetter() or sinon.stub(object, 'method').get(fn) throws Cannot redeclare property . I opened an issue about it on their Github's repo and someone told me that sinon.stub(ManagementClient.prototype, 'createUser', fn) was working but the problem is that this syntax is deprecated since v3.0.0 . I tried using sinon.stub(ManagementClient.prototype, 'createUser').callsFake(fn) which is supposed to replace the old syntax but it doesn't work as the previous syntax seemed to. Here is a runkit showing that in action.

My question is: is there a way for me to stub that getter even though it is declared as configurable: false or am I screwed? I can't seem to find a way.

I already asked them if they would consider updating their Object.defineProperty call to set configurable: true but to no avail.

Answer 1

It doesn't seem to be possible to override the property defined with configuration: false so I ended up making my own wrapper around Auth0 SDK and stubbed it instead of the SDK itself.

Here is an example:

If you have the SDK with a foo() method. You then create a new class:

import Auth0 from 'auth0';

class Auth0Wrapper {
  foo() {
    return Auth0.foo();
  }
}

This class is really dumb it acts as a proxy to the original method. The point is just that now you can easily stub your class no matter how the underlying SDK was developed.