Basic linters for project

[abhilashlr]

Since we are just setting up this repo, should we think of linters for all the files that we might have? There are a basic set of linters already in place, it would be nice if we can have rules like standard prettier or airbnb styles in place.

Ember-cli follows:
https://github.com/ember-cli/ember-cli/blob/master/.eslintrc.js

[JennyJudova]

Completely support this! And I think it makes sense to use the same linter as ember-cli.

[abhilashlr]

@kennethlarsen Should we default to prettier style for linting? Here's what I had in mind:

1. ESLint: prettier with single quotes, semicolons, etc, like below:

   {
     singleQuote: true,
     semi: true,
     bracketSpacing: true,
     endOfLine: 'lf',
     tabs: false,
     tabWidth: 2
   }
   

2. Stylelint: stylelint-config-standard
3. Template lint: defaults to octane

[rwjblue]

I’d vote for doing the setup I describe in emberjs/rfcs#628 😃

[kennethlarsen]

Agree with Robert! @abhilashlr is that something you can help out with?

[abhilashlr]

@rwjblue yep, precisely what I meant as well citing few example configurations. I think as mentioned in the RFC, we can restrict to singleQuote: true.

[abhilashlr]

@kennethlarsen Sure, I will work on it 👍

[abhilashlr]

@kennethlarsen @rwjblue Here you go #22. Let me know if there are some changes that need to be done in the setting up of the rules.
@rwjblue Can you please clarify on the order of the extends array property in .eslintrc.js file as well or does the order not matter?