For example: If you use url that begins with https://cdn.skypack.dev
in your import. It will try to fetch typings from skypack and save them in typings folder referencing to jsconfig. This should provide typings for example in VSCode.
import React from 'https://cdn.skypack.dev/react';
So if the file contains url import purplehaze
will fetch typings, add them to typings folder and tsconfig file for intellisense support.