When trying to check a condition in Angular using a boolean, a TypeError is generated stating that a stream was expected instead of the provided 'false' value

Error: In global-error-handler.ts file at line 42, a TypeError has occurred. It states: "You provided 'false' where a stream was expected. You can provide an Observable, Promise, ReadableStream, Array, AsyncIterable, or Iterable."

Below is the snippet of code that triggered this error:

getPreloadPendingCountSuccess$ = createEffect(() =>
    this.actions$.pipe(
      ofType(fromActions.GetPreloadPendingCountSuccess),
      switchMap(({ count, shouldUpdateMovements }) => {
        return shouldUpdateMovements && count > 0 && [fromActions.GetPreloadPendingMovementsRequest()];
      })
    )
  );

The issue seems to be related to the boolean parameter shouldUpdateMovements. The code works without it, but it is required for proper functioning. How can I resolve this problem? Thank you.

Answer №1

When utilizing the logical AND operator (&&), the function is expected to return an array. If the first condition evaluates to false, the function will return false instead.

return shouldUpdateMovements && count > 0 ? [fromActions.GetPreloadPendingMovementsRequest()] : [];

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