Current we don't throw errors in cases like this:

def example() -> str:
    ...

@strawberry.type
class Q:
    x: int = strawberry.field(resolver=example)

We should raise an error when this happens. We should also maybe allow to change the error to a warning, to make it easier to upgrade.

We could also prevent this (maybe as opt-in/out behaviour):

def example():  # missing type
    ...

@strawberry.type
class Q:
    x: int = strawberry.field(resolver=example)