Are you submitting a bug report or a feature request?

Feature request

What is the current behavior?

Type errors with react-native + typescript

What is the expected behavior?

No type errors :P

What's your environment?

I'm using react-final-form with react-native

"react-final-form": "^2.1.1",
"final-form": "^3.0.0",
"react": "16.0.0",
"react-native": "0.50.4",

Other information

There are two situations where I have type errors.

1. handleSubmit

The current type for handleSubmit is:

handleSubmit: (event: React.SyntheticEvent<HTMLFormElement>) => void

How can we deal with this in react-native?
onPress events of touchables have this signature:

onPress?: (event: GestureResponderEvent) => void;

2. Field extra props

Sometimes we need to pass some extra props to the underlying component of Field

            <Field
              name='firstName'
              component={TextInputField}
              style={styles.textInputStyle}
            />

In this case, the style prop is the extra one.
The type system complains because the props that Field is expecting are:

export type FieldProps = {
  allowNull?: boolean
  format?: ((value: any, name: string) => any) | null
  parse?: ((value: any, name: string) => any) | null
  name: string
  subscription?: FieldSubscription
  validate?: (value: any, allValues: object) => any
  value?: any
} & RenderableProps<FieldRenderProps>

Maybe we should allow anything here? :\ 👎