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  • I found out that problem is from not considering nodejs feature.
    – cortex Arm Why so sad
    Commented Sep 5 at 6:10
  • conclusion is need to consider microtask and event loop on this example code, when converting Promise to Observable by using from() or defer(). I thought that converted promise immediately returns values in callback of swtichMap() and returing is handled on test() execution. but, it is handled on asynchornously and seemed to be queued in microtask q.
    – cortex Arm Why so sad
    Commented Sep 5 at 6:34
  • adding delay() pipe-operator gave me hint. when I set delay 0s, I got expected result. Due to delay() queues userInfo$ execution on microtask queue, userInfo$ exeuction runs after test() execution. since there is no task on callstak , test() has been done already, converted Promise returns value immediately to userInfos$.
    – cortex Arm Why so sad
    Commented Sep 5 at 6:40