Mocked method arguments not allowed when verifying method was called

First of all, awesome library! Started looking at options for a new project yesterday and I’m already hooked.

I encountered one issue trying to verify that a method on a mock object has been called. I’m mocking Aurelia class from the aurelia framework. See the type definition here: https://github.com/aurelia/framework/blob/master/dist/aurelia-framework.d.ts#L35

Calling setRoot(arg) is allowed on the mock object but not when verifying that it has been called. The problem looks like this in my editor:

The two overloads for setRoot() visible in intellisense look like this:

Aurelia.setRoot(...) doesn’t really have overloads. But, the real one is not anymore available when calling setRoot() after received():

Do you happen to know what could cause this issue?

Luckily, there is a workaround that allows the method to be called with an argument and the test to pass:

(aurelia.received(1) as Aurelia).setRoot("gui/suite-gui");

[ffMathy]

Still investigating.

[ulrichsg]

I’ve run into the same issue with the Counter.inc() method from https://www.npmjs.com/package/prom-client. In this case there are also two overloads, with one having a mandatory parameter and the other one having only optional parameters (https://github.com/siimon/prom-client/blob/master/index.d.ts#L183). The parameter I am passing is actually the mandatory one. Here’s a minimal example:

import { Substitute } from '@fluffy-spoon/substitute';
import { Counter} from 'prom-client';

describe('Potential issue with received()', () => {
  it('fails with "TS2554: Expected 0 arguments, but got 1"', () => {
    const mockedCounter = Substitute.for<Counter>();
    mockedCounter.inc({ foo: 'bar' });
    mockedCounter.received(1).inc({ foo: 'bar' });
  });
});