Pete Bacon Darwin 1579df243d fix(core): ensure the type T of EventEmitter<T> can be inferred (#40644)
The `AsyncPipe.transform<T>(emitter)` method must infer the `T`
type from the `emitter` parameter. Since we changed the `AsyncPipe`
to expect a `Subscribable<T>` rather than `Observable<T>` the
`EventEmitter.subscribe()` method needs to have a tighter signature.
Otherwise TypeScript struggles to infer the type and ends up making
it `unknown`.

Fixes #40637

PR Close #40644
2021-02-03 09:07:29 -08:00
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