Package is required to get backwards compatibility with RxJS previous to version 6. It contains the imports to add operators to `Observable.prototype` and creation methods to `Observable`.
This package is required to get backwards compatibility with RxJS previous to version 6. It contains the imports to add operators to Observable.prototype and creation methods to Observable. This is what allows, for instance, dot-chaining:
Observable.interval(1)
.map(i => i * i)
vs
Observable.interval(1)
.pipe(map(i => i * i))
More information: https://github.com/ReactiveX/rxjs/tree/master/compat