How to use the rxjs-es/observable/from.from function in rxjs-es

    planAndTarget => observableFrom(Scheduler.performerRegistry)::find(
      Performer => Performer.canHandle(planAndTarget)
    )::tap(
      Performer => {
        console.assert(
          Performer !== undefined,
          planAndTarget.plan,
          `Material Motion could not find a Performer class to handle this plan.  ` +
          (
            Scheduler.performerRegistry.length === 0
              ? `To ensure all the default Performers are available, add this line to your application:\n\n` +
                `    import * as MaterialMotion from "material-motion-experiments";`
              : `If you are using a custom Performer, ensure that you've registered it with the Scheduler:\n\n` +
                `    Scheduler.registerPerformer(MyCustomerPerformerClass)`
          )
        );
      }