[Code style] Configure ESLint better

[subhramit]

1. Example (see which rules could be relevant).
2. Once Prettier is established ([Code Style] Add Prettier #18), for conflicts, override ESLint > Prettier (example).

[koppor]

Use prettier for reformat? 😅

[subhramit]

Use prettier for reformat? 😅

Not really re-format, but people usually use prettier for code formatting and ESLint for static analysis/code quality, but eventually some rules coincided and the lines blurred a bit between the two. So in certain cases the default rules conflict (AFAI remember) e.g. I think the default style prettier suggests is
function(a, b, c) { ...
And by defaut ESLint suggests
function (a, b, c) { ...
If we don't add an override configuration, the one of them will complain.
Things could be different now, this was the case a year ago where I worked interned.