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How do you currently use `Callback` without `CallbackFunction`?

For example, using the `aws.cloudwatch.EventRuleEventSubscription` you can specify a callback directly rather than creating a CallbackFunction Lambda.

`Callback` is defined as `type Callback&lt;E, R&gt; = (event: E, context: Context, callback: (error?: any, result?: R) =&gt; void) =&gt; Promise&lt;R&gt; | void`

rather than CallbackFunction which extends `LambdaFunction`

Thanks! I think you are right and you'd have to convert to `CallbackFunction` to change the runtime.