[Juggler] Spike: EventEmitters in the new world of async/await

[bajtos]

What to do with EventEmitters (Observables?) after all other callback-based APIs were upgraded to Promises and async/await via #896?

See also #537 (comment)

[raymondfeng]

@bajtos I had a similar PoC at https://github.com/strongloop/loopback-next/blob/008b3fd081f39f0055ea5e16c5124a84a07a688d/packages/core/src/sequence.ts#L96. We can refactor the core async publish/subscribe logic into its own.

[kjdelisle]

@raymondfeng Would it make sense to incorporate an existing framework like RxJs instead of building that ourselves?

[raymondfeng]

RxJs seems to be fairly complicated at least for the number of APIs. We can align it with https://github.com/tc39/proposal-observable.

[kjdelisle]

@raymondfeng The proposal link has zen-observable as well, and it seems more straightforward than RxJS. Would that be any better, or are we planning to make something that maps strictly to the proposal with no extras?

[raymondfeng]

We can pick a reasonable module to start with and see if it fits our needs. I won't ask for compliance.

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