how to use the timer function from the rxjs library in javascript

index.tsx
import { timer } from 'rxjs';
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index.tsx
// delay of 1 second, no period
const timer1 = timer(1000);

// delay of 2 seconds, period of 1 second
const timer2 = timer(2000, 1000);
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index.tsx
timer1.subscribe(value => console.log(value)); // 0, 1, 2, 3, ...

// or

const timerSubscription = timer2.subscribe(
  value => console.log(value), // next
  error => console.error(error), // error
  () => console.log('done') // complete
);
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index.tsx
timerSubscription.unsubscribe();
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