IntelliJ IDEA is unable to detect Observable operators in rxjs5

After installing rxjs 5 beta 3 through npm, using the command

npm i <a href="/cdn-cgi/l/email-protection" class="__cf_email__" data-cfemail="2f5d57455c6f1a011f011f024d4a5b4e011c">[email protected]</a>
, I encountered an issue with operator recognition in my IDE.

Here is a snippet of the code causing trouble:

import {Observable} from "rxjs"

new Observable(o => o.next(42)).filter(() => true);

While this code compiles correctly with ts-node, IntelliJ IDEA fails to recognize the filter() operator and other operators when used on an Observable instance.

The static members suggested for Observable are:

  • create()
  • if()
  • throw()

And for an instance of Observable:

  • _isScalar()
  • forEach()
  • lift()
  • subscribe()

Even after trying to import only necessary components, IntelliJ IDEA continues to flag filter() as non-existent:

import {Observable} from "rxjs/Observable"
import "rxjs/add/operator/filter"

new Observable(o => o.next(42)).filter(() => true);

Does anyone have any suggestions on how to resolve this issue in IntelliJ IDEA?

Answer №1

In order to resolve this particular issue, it is necessary to include RxJS as a javascript library in IntelliJ:

  1. Navigate to Settings -> Languages and frameworks -> JavaScript -> Libraries
  2. Press on Add...
  3. Insert node_modules/rxjs by selecting the + button
  4. Continue clicking all OK buttons until you return to your editor.

This method has been successfully tested on IDEA 2016.1.3

Answer №2

Make sure to review the latest version of IDEA 2016.1.2 or newer by visiting this link

Note: It is essential that the directory node_modules is not excluded from the project.
If it is excluded, refer to the answer provided at this link

Note 2: Ensure that the file package.json includes the direct dependency (or devdependency) 'rxjs'

Answer №3

The suggested remedy turned out to be ineffective. Despite trying out IntelliJ IDEA 2016.2.1 EAP (ideaIU-162.1447.7), the issue persisted.

Delving deeper into the matter:

  1. The proposed solution referenced version 2016.1, but that did not resolve the problem.
  2. A follow-up comment included a link to IntelliJ bugtracker, where the original poster (OP) had the primary comment.
  3. Subsequently, in the discussion thread of the bug report, a comment mentioned affirming that IDEA 2016.2 162.426.1 EAP would address the issue definitively; however, this was not the case.

In essence, even after importing all functionalities of RxJS with

import {Observable} from 'rxjs/Rx';
, IntelliJ still raises errors indicating it cannot locate methods such as .map and .filter.

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