How to include npm packages? Ethers.js?

[Aaron]

Hello,

I am wondering how I can include npm packages. I saw that there is a package.json and package-lock.json in the scripts folder, but how can I incorporate those? For example, how is springly included? Simply using "require" doesn't seem to work, although that does the job for lodash.
I am mainly aiming to include the npm module ethers.js.

Thanks.