Assertions on action calling another action within the same store

[cod1o]

Given an options store:

export const useTestStore = defineStore("testStore", {
    actions: {
        foo(): void {
            this.bar();
        },

        bar(): void {
            console.log("bar");
        },
    },
});

I can verify that foo calls bar using:

describe("Test", () => {
    beforeAll(() => {
        vi.resetAllMocks();
    });

    test("Test foo calls bar", () => {
        // Arrange
        setActivePinia(
            createTestingPinia({
                stubActions: false,
            })
        );

        const store = useTestStore();

        // Act
        store.foo();

        // Assert
        expect(vi.mocked(store.bar)).toBeCalled();
    });
});

Now, if I change the store to setup syntax:

export const useTestStore = defineStore("testStore", () => {
    function foo(): void {
        bar();
    }

    function bar(): void {
        console.log("bar");
    }

    return {
        bar,
        foo,
    };
});

..The test fails: with AssertionError: expected "spy" to be called at least once. Same behavior when changing the actions to arrow-functions.

If i pass this to the action functions, the test succeeds again:

export const useTestStore = defineStore("testStore", () => {
    function foo(this: any): void {
        this.bar();
    }

    function bar(): void {
        console.log("bar");
    }

    return {
        bar,
        foo,
    };
});

But would rather avoid passing around this: any. Any other workaround to this?