TypeScript: Intellisense stops returning anything in js project

From @andreasgruenh on April 5, 2018 16:35

• VSCode Version: 1.21.1
• OS Version: Win 10 pro

Steps to Reproduce:

1. Initiate a create-react-app project (I cannot reproduce the error in a blank project)
2. Add a jsconfig.json with the content: {}
3. Open src/App.js
4. Hover and Intellisense (triggered by ctrl + space) should work
5. Create a new file “src/x.js”
6. Intellisense should still work
7. Type import React from 'react';
8. Test if intellisense is still working (if not, delete the file and go back to step 5 and use another filename)

After looping 3-6 times, the error occurs and Intellisense and hover information are broken and will only come back when the tsserver is restarted.

Does this issue occur when all extensions are disabled?: Yes

I uploaded the log when this occured here: https://gist.github.com/andreasgruenh/95dfe15dd23d3dfdb547db088199fdbd

Here is a gif of the reproduction: https://gfycat.com/LavishMasculineDuckbillplatypus The Window has been reloaded directly before the start of the gif and the bug occurs after the 4th file has been created.

Copied from original issue: Microsoft/vscode#47248