feat: Run ESLint with colors in supported environments

[MaximDevoir]

My guess is ESLint is disabling color formatting because it's unable to detect a TTY when invoked through execFile().

Comparision

[koddsson]

I like this but this would get mangled when running in some CI systems that don't support color.

Maybe we can use supports-color to detect if the terminal supports color or not?

[MaximDevoir]

Okay, I'll work on getting that integrated.

[MaximDevoir]

I looked through the eslint repo and it seems that they are using a very limited set of colors. Therefore, to run ESLint with the --color flag, the environment only needs to support basic colors (16 colors).

From what I gathered, ESLint uses these colors:

• red
• yellow
• green
• blue
• bold - from chalk.bold()
• dim - from chalk.dim()

A basic 16-color environment is enough to support the --color flag and the modifiers are widely available.

[koddsson]

This is looking good to me.

The stylish-fixes custom formatter that we ship with this project won't get these benefits since we'd need to color the output manually and I think that's probably out of scope for this PR.