What is the build tool that three.js uses for the build folder (NPM)

I want to make an NPM package with a similar build folder to how 3.js does it. My package name is currently Roblox File Handler (my live code is in unstable branch RN)

So what is the build package the three.js uses, is it Gulp? if it is, how did you combine all the files together? (I already know how to minify them with gulp)

three.js uses rollup:

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