how to use the lastvaluefrom function from the rxjs library in typescript

The lastValueFrom function from the rxjs library is used to get the last value emitted by an observable, after it completes. Here's an example of how to use this function in TypeScript:

index.ts
import { lastValueFrom } from 'rxjs';

const myObservable = ... // create an observable

async function myFunction() {
  const lastValue = await lastValueFrom(myObservable);
  console.log(`The last value emitted by the observable is: ${lastValue}`);
}
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Note that lastValueFrom returns a promise, so it can only be used inside an async function. Also, if the observable never completes or emits any values, lastValueFrom will hang forever. So be sure to handle error cases appropriately.