Function cause

packages/effect/src/unstable/reactivity/AsyncResult.ts:451–452

(self: AsyncResult<A, E>)

 * @since 4.0.0
 */
export const cause = <A, E>(self: AsyncResult<A, E>): Option.Option<Cause.Cause<E>> =>
  self._tag === "Failure" ? Option.some(self.cause) : Option.none()

/**
 * Returns the first typed error from a failure cause, or `None` for successes, initial results, defects, and interrupt-only causes.