just

Creates an Observable that holds a single static value and immediately completes. Useful inside switchMap to emit a fallback value when no asynchronous work is needed.

Example

import { just, switchMap, fromAbortablePromise, source } from 'synstate';
import { Result } from 'ts-data-forge';

const auth$ = source<{ id: string } | null>({ id: '1' });

const userData$ = auth$.pipe(
    switchMap((auth) =>
        auth
            ? fromAbortablePromise((signal) =>
                  fetch(`/api/user/${auth.id}`, { signal }).then((r) =>
                      r.json(),
                  ),
              )
            : just(Result.ok({ name: 'Guest' })),
    ),
);

View source on GitHub