Remove unnecessary dependencies

[gaearon]

Update: claimed by @Alamgird

Now that we have a monorepo structure, we can pull out some of the small and annoying dependencies from packages/react-scripts/package.json into packages/react-dev-utils/package.json and provide helpers there instead.

I started this in #723 but packages/react-scripts/scripts/build.js is still pretty noisy, and we could extract the code to compare build sizes (and maybe something else) into react-dev-utils.

I recommend the following workflow:

1. Look at packages/react-scripts/package.json
2. See where these dependencies get used
3. If they seem non-essential and too low-level, figure out how to hide them in react-dev-utils
4. Repeat

This is a contributor issue. I don’t plan to work on this right now so please write a comment if you intend to take it. Please don’t start working without a comment so we don’t have many people solving the same problem.

If you need any help, ping me in this issue and I’ll be happy to reply or explain something.

[dalamgir]

will take a crack at it

[gaearon]

You got it @Alamgird!

[amilajack]

npm-check might be a good solution for this

[gaearon]

I think they’re technically useful, it’s just that we don’t want them directly under react-scripts because its deps pollute the project after ejecting. We now have a utility module (react-dev-utils), and we should just extract things users won’t want to change there.

[Timer]

@Alamgird I'm going to open this back up unless if you are still interested in working on it.