Git fork and NPM install git-URL in your own version

Sometimes, you want to in stall an NPM package, but it isn't complete enough, or there isn't a TypeScript definition. You can extend it, by git fork -- and then npm install <URL>.git. -- You might need to edit git fork in your own computer first, though.

Not only NPM. Python's PIP can do this as well.

After extending the fork, you might consider git merge to contribute to the main branch.