Drop NodeJS 8

[KingDarBoja]

PR Checklist

• Addresses an existing issue: fixes Drop support for NodeJS 8 #328
• That issue was marked as status: accepting prs

Overview

This PR has few changes:

• Set minimum engine to Node +10.
• Update dependencies to latest available version.
• Provide missing return types on most error messages after running npm run eslint.
• Export message on no-shadow-variable converter

[KingDarBoja]

@JoshuaKGoldberg ping!

[JoshuaKGoldberg]

The CircleCI config change looks great, but let's avoid modifying source code for this one.

[KingDarBoja]

@JoshuaKGoldberg I will close this PR and open a new one with only the CircleCI and the package.json engine changes.

But these stuff should be done on separate PRs:

• Bump dependencies
• TSLint rules (maybe migrate to ESLint?).

Once again, my apologies for wasting your time when I made this PR as I tend to put extra stuff on my PRs (I couldn't resist 🙈 ). But been learning to control my need for fix everything at once.

Cheers!

[JoshuaKGoldberg]

Haha that's a struggle I have to get through the hard way... at least several times a year 😹. Thanks!

Bump dependencies

I sent a request to the typescript-eslint super-admins to install Renovate to take care of that. Good callout.

TSLint rules

By which you mean.. updating to the newest typescript-eslint rules, since we're on ESLint? I'm up for discussing, but don't feel particularly passionate about them - feel free to open up issues for ones you'd like to enable.

[KingDarBoja]

By which you mean.. updating to the newest typescript-eslint rules, since we're on ESLint? I'm up for discussing, but don't feel particularly passionate about them - feel free to open up issues for ones you'd like to enable.

Ah yeah, ESLint ones, I got confused too 🙈 Looks like I haven't been up to date with latest changes.