Dmitry Gozman 4bb563b015
fix(expect): proper return types (#13334)
A few changes:
- `Matchers<R, T>` now carries both return and argument type.
- Based on the argument type, we apply playwright-specific Page/Locator matchers.
- Return type is usually void, unless wrapped with `expect.resolves`,
  `expect.rejects` or `expect.poll()`.
- To preserve compatibility with any extended types in the wild,
  argument type is optional.
2022-04-05 16:11:11 -07:00
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