In #1044 the types of getNativeFormProps methods in bridges were improved. I believe we can add more exact typings to the returned value here by also specifying the children prop type. Possibly other form props as well? Perhaps we could base the type on the native form prop types provided by React and omit all the necessary properties. Method in question.

Example problematic case when creating a custom Form component by extending the BaseForm:

	public render() {
		const {children} = this.getNativeFormProps()
		return (
			<div>
				{children}
			</div>
		)
	}

which produces the following type error:

TS2322: Type 'unknown' is not assignable to type 'ReactNode'.   Type 'unknown' is not assignable to type 'ReactPortal'.