This library is not in NPM. As a result, you need to add it to your project and build it locally.
To do so, you have three options:
Regardless of which option you choose, the following steps all apply.
Enter the lib directory for the library and run the following commands:
npm install
npm run build
In your project directory, run the following:
npm i /path/to/package/d4h-typescript/lib
Using a relative path will also work without issue.