Access testData from beforeEach for parameterized test

Question

I do want to create test data in the beforeEach method and access that data to give to the parameterized test but I get an error TS2454: Variable  testData  is used before being assigned.

describe('Test', async () => {
  let testProduct: Product

  beforeEach(async () => {
      testData = await createUser();
  })

  [
    { input: testProduct.id, error: false }, // TS2454: Variable  testData  is used before being assigned
    { input: "Non Existent", error: true },
  ].forEach(({ input, error }) => 
    it('Test Query', async () => {
      const client = createApolloTestClient();
      const res = await client.query<{userFound: boolean}, {id: string}>({
        query: ProductQuery,
        variables: {id: input}
      });
      expect(res.data?.userFound).toBe(error)
    }))
})

How can I refactor this to make it work?