ignoreElements with concat #rxjs

index.js

const { rxObserver } = require('api/v0.3');
const { timer, of, concat } = require('rxjs');
const { take, ignoreElements } = require('rxjs/operators');


const source$ = timer(10, 5).pipe(take(4));

const result$ = concat(
  source$.pipe(ignoreElements()),
  of(true)
);


source$.subscribe(rxObserver('source$'));
result$.subscribe(rxObserver('concat( source$ :: ignoreElements() , of(true) )'));