timeout

signature: timeout(due: number, scheduler: Scheduler): Observable

Error if no value is emitted before specified duration

Examples

Example 1: Timeout after 2.5 seconds

( jsBin |
jsFiddle )

import { of } from 'rxjs/observable/of';
import { concatMap, timeout, catchError } from 'rxjs/operators';
// simulate request
function makeRequest(timeToDelay) {
  return of('Request Complete!').pipe(delay(timeToDelay));
}
of(4000, 3000, 2000)
  .pipe(
    concatMap(duration =>
      makeRequest(duration).pipe(
        timeout(2500),
        catchError(error => of(`Request timed out after: ${duration}`))
      )
    )
  )
  /*
    *  "Request timed out after: 4000"
    *  "Request timed out after: 3000"
    *  "Request Complete!"
    */
  .subscribe(val => console.log(val));

Additional Resources

• timeout
  - Official Docs

Source Code:
https://github.com/ReactiveX/rxjs/blob/master/src/internal/operators/timeout.ts