expand

expand recursively turns each emission into another stream:
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const { rxObserver } = require('api/v0.3');
const { of, timer, EMPTY } = require('rxjs');
const { expand, take, mapTo } = require('rxjs/operators');
const T = 5;
of(1).pipe(
    expand(value =>
      value < T
      ? timer(T, T).pipe(
          take(value + 1),
          mapTo(value + 1)
       )
      : EMPTY
    )
  )
  .subscribe(rxObserver());
 
 
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