How to reset intellisense in VS Code?

Restart the TypeScript language service

In VS Code, and in a TypeScript source file (this won't work in a css or json file),

1. Open the Command Palette (view menu → command palette)
2. Enter TypeScript: Restart TS server. (type "restart" and it should autosuggest)

You may Ctrl+Shift+P or F1, then write "reset.." in command pallete, and choose in popup list "C/C++ Reset IntelliSense database".