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The JavaScript IntelliSense is not working on Visual Studio 2017 RTM editor. I can’t even format the code, nothing is working.
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If IntelliSense in Visual Studio 2019 stopped working, the issue could be related to NuGet. In this case, to resolve the issue, just delete the contents of the packages folder. Close all instances of Visual Studio 2019. Delete the contents of the packages folder at the root of your local machine.
If you find IntelliSense has stopped working, the language service may not be running. Try restarting VS Code and this should solve the issue. If you are still missing IntelliSense features after installing a language extension, open an issue in the repository of the language extension.
You can enable or disable particular IntelliSense features in the Options dialog box, under Text Editor > C/C++ > Advanced.
UPDATE: Looks like latest update of VS 2017 (15.3) solve the issue.
This is because of the new javascript language service http://aka.ms/JavaScriptExperimental
To disable and bring back JS, go to: Tools - Options - text editor - Javascript/Typescript - Language service - General and disable the very first option.
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