Observable of is not a function

Question

I am having issue with importing Observable of function in my project  My Intellij sees everything  In my code I have   import  Observable  from  rxjs Observable     and in my code I use it like that   return Observable of res     Any ideas

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In rxjs v6  of operator should be imported as import   of   from  rxjs

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Somehow even Webstorm made it like this import  of  from  rxjs observable of   and everything started to work

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I am using Angular 5 2 and RxJS 5 5 6  This code did not work        import   Observable of   from  rxjs Observable         getHeroes    Observable lt Hero   gt            return of Hero    HEROES             Below code worked       import   Observable   from  rxjs Observable       import   Subscriber   from  rxjs Subscriber         getHeroes    Observable lt Hero   gt                    return Observable create  observer  Subscriber lt any gt     gt                  observer next HEROES                 observer complete                             Calling method   this heroService getHeroes          subscribe heroes   gt  this heroes   heroes     I think they might moved changed of   functionality in RxJS 5 5 2

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RxJS 6  When upgrading to version 6 of the RxJS library and not using the rxjs-compat package the following code  import  rxjs add observable of                 return Observable of res     has to be changed into  import   of   from  rxjs              return of res

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I had this problem today  I m using systemjs to load the dependencies   I was loading the Rxjs like this           paths             rxjs      node modules rxjs bundles Rx umd min js               Instead of use paths use this   var map          rxjs                          node modules rxjs          var packages          rxjs     main   bundles Rx umd min js   defaultExtension   js            This little change in the way systemjs loads the library fixed my problem

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Actually I have imports messed up  In latest version of RxJS we can import it like that   import  rxjs add observable of

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Upgraded from Angular 5   Rxjs 5 to Angular 6   Rxjs 6   You must change your imports and your instantiation  Check out Damien s blog post  Tl dr   import   Observable  fromEvent  of   from  rxjs    const yourResult   Observable      create of yourObservable        startWith null       map x   gt  x someStringProperty toLowerCase        subscribe to keyup event on input element Observable      create fromEvent yourInputElement   keyup         debounceTime 5000       distinctUntilChanged        subscribe  event    gt            yourEventHandler event

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For me  Angular 5  amp  RxJS 5  the autocomplete import suggested    import   Observable   from                 node modules rxjs Observable     while to should be  with all static operators from  of  e c t working fine     import   Observable   from  rxjs Observable

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For Angular 5     import   Observable   from  rxjs Observable  should work  The observer package should match the import as well import   Observer   from  rxjs Observer   if you re using observers that is  import   lt something gt   from  rxjs   does a huge import so it s better to avoid it

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Patching wasn t working for me  for whatever reason  so I had to resort to this method   import   of   from  rxjs observable of           return of res

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My silly mistake was that I forgot to add  add when requiring the observable   Was   import   Observable   from  rxjs Observable   import  rxjs observable of     Which visually looks OK becasue rxjs observable of file  in fact  exists   Should be   import   Observable   from  rxjs Observable   import  rxjs add observable of

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If anybody is having this problem while using Angular 6 rxjs 6 see the answers here  Could not use Observable of in RxJs 6 and Angular 6  In short  you need to import it like this   import   of   from  rxjs     And then instead of calling  Observable of res     just use  of res

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This should work properly just try it   import   Observable   from  rxjs Observable   import  rxjs add observable of

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rxjs     5 5 10  import   of   from  rxjs observable of          return of res

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You could also import all operators this way   import  Observable  from  rxjs Rx

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If you are using Angular 6  7   import   of   from  rxjs     And then instead of calling  Observable of res     just use  of res

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import  rxjs add observable of     shows a requirement of rxjs-compat   require  rxjs-compat add observable of      I did not have this installed  Installed by   npm install rxjs-compat --save-dev   and rerunning fixed my issue

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Although it sounds absolutely strange  with me it mattered to capitalize the  O  in the import path of import  Observable  from  rxjs Observable  The error message with observable 1 Observable of is not a function stays present if I import the Observable from rxjs observable  Strange but I hope it helps others

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Just to add   if you re using many of them then you can import all using   import  rxjs Rx      as mentioned by  Thierry Templier  But I think If you are using limited operator then you should import individual operator like  import  rxjs add operator filter   import  rxjs add operator mergeMap   import  rxjs add observable of     as mentioned by  uksz   Because  rxjs Rx  will import all the Rx components which definitely cost performance

[angular] Observable.of is not a function

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