refactor: ESlint migration & prettier

[bartekleon]

fixes: #1719
fixes: #1271

[bartekleon]

Nico... I am soo sorry :< and you probably know why. But this prettier was so nicely configured by default and that array-type looks much better now >_<

[bartekleon]

travis... hello? I have removed TSlint -.-

[bartekleon]

@nicojs help... Travis hates me ;-; (NVM, prune works just fine :) and everything is working so far O.o )

[bartekleon]

IT'S GREEN YAAAAAAAAS 🎉

[bartekleon]

@nicojs If you could check & possibly merge this it would be nice <3 :3

[nicojs]

This looks really good! I'll have a closer look later today and if everything goes well I'll merge it. Thanks a lot! 👍

[nicojs]

I've added configuration to fix-on-save in vscode.

I absolutely love some of the rules eslint brings to the table. We should enable more rules :). For example @typescript-eslint/no-floating-promises. There is no reason to have dangling promises, and they probably all bugs. Enabling the rule will show a couple of bugs. We can enable rules in separate issues IMHO, not in this one.

[bartekleon]

Love it @nicojs! For now it would be nice if you merge it. Then we can discuss other rules which should be changed! (Take a consideration that for now @typescript-eslint is ~beta version - it doesn't have all features it had before, and so some are missing like ordered-imports [unless they changed it in some last versions])

[nicojs]

Yeah, I've tried to enable ordered imports. It works, but it doesn't have the autofix feature: https://eslint.org/docs/rules/sort-imports

The --fix option on the command line automatically fixes some problems reported by this rule: multiple members on a single line are automatically sorted (e.g. import { b, a } from 'foo.js' is corrected to import { a, b } from 'foo.js'), but multiple lines are not reordered.

Never mind that for now. Thanks a lot once again. Logging off for tonight 🍻