Mocking a Readonly type returns undefined

[jasonadkison]

Subject of the issue

When trying to create a mock for Readonly type the result is undefined

Your environment

• ts-auto-mock version: 3.1.0
• typescript version: 4.1.3
• node version: 12.14.0
• npm version: 6.13.4

Steps to reproduce

test('can mock Readonly type', () => {
  const mock = createMock<Readonly<{ foo: string }>>();
  expect(typeof mock.foo).toBe('string'); // TypeError: Cannot read property 'foo' of undefined
});

test('can mock Readonly type', () => {
  const mock = createMock<Readonly<{ foo: string }>>({ foo: 'bar' });
  expect(typeof mock.foo).toBe('string'); // This works because of the property overrides provided to `createMock`
});

Expected behavior

The Readonly mock should be created.

Actual behavior

The mock is created as undefined.

[Pmyl]

Unfortunately we don't support mapped types as described here https://typescript-tdd.github.io/ts-auto-mock/types-not-supported#indexed-access-type-with-generics

We would like to but typescript doesn't have very good tools for us to understand the type. We're always keeping it under the radar but right now we can't do much.

To cope with that we created "createHydratedMock" https://typescript-tdd.github.io/ts-auto-mock/create-hydrated-mock

That works very well if you need the whole mock to be required

Let me know