finalize

Being similar to native JS finally, RxJS finalize operator lets you run a function upon stream termination, regardless whether it completed, failed, or was unsubscribed from:

Open browser console to see the output

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const { rxObserver } = require('api/v0.3');
const { timer } = require('rxjs');
const { finalize } = require('rxjs/operators');

timer(5)
  .pipe(
    finalize(()=>
      console.log(`Finished @ ${ Date.now() }ms`)
    )
  )
  .subscribe(rxObserver());

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See finalize vs tap comparison