VS code is displaying javascript and typescript help (intellisense) twice for any item

Question

VS code is displaying javascript and typescript help (intellisense) twice for any item as shown in this snapshot, what is causing this and to show the help only once?

Answer 1

This was caused by my installation for the following extension

JavaScript and TypeScript IntelliSense sourcegraph.javascript-typescript Preview

This is because vs code by default has another similar built in extension, which is called

TypeScript and JavaScript Language Features vscode.typescript-language-features Built-in

So to have the help shown once as expected, you should choose one of the two extensions shown above (for the built-in you might only disable but not remove, for the first extension you can uninstall or disable)

I kept checking the extensions of vs code for long time until I found out the reason and wanted to share it in Question & answer to the community, I hope it helps.