Update to follow ember last changes and split ember in 3 configs (JS-190)

[GreatWizard]

⚠️ Breaking change

Update ember configs in order to be compliant with recent ember version (#48)

Our previous dependencies wasn't updated to follow new code from ember 3.12~3.15.

• Update dependencies
• Slim down config to ember-cli generated one
• split configs into 3 : ember, ember-addon and ember-test in order to make them more simple
• Adapt ember/no-jquery from "error" to "warn" in order to not add pressure on the legacy

Impacts of the update

New .eslintrc.js files

• For your application:

// my-app/.eslintrc.js
module.exports = {
  root: true,
  extends: ['peopledoc/ember']
}

• For your addon:

// my-addon/.eslintrc.js
module.exports = {
  root: true,
  extends: ['peopledoc/ember-addon']
}

• For your tests in ember application/addon:

// my-app/tests/.eslintrc.js
module.exports = {
  root: true,
  extends: ['peopledoc/ember-test']
}

withFeature is not globally accepted anymore

If you were using ember-feature-flag and the old withFeature helper, please consider update your code by using:

import { enableFeature } from 'ember-feature-flags/test-support';

Source: https://github.com/kategengler/ember-feature-flags#test-helpers

New warning:

• Do not use jQuery (ember/no-jquery)

Warn every usage of jquery, that can help in order to detect legacy code.

New errors:

• import is duplicated (no-duplicate-imports)

// Before
import Service from '@ember/service'
import { inject as service } from '@ember/service'

// After
import Service, { inject as service } from '@ember/service'

• Expected blank line between object properties (ember-suave/lines-between-object-properties)

// Before
{
 a: {},
 b: {}
}

// After
{
 a: {},

 b: {}
}

• Expected blank line before this statement (padding-line-between-statements)

See https://eslint.org/docs/rules/padding-line-between-statements

// Before
      if (user.get('id')) {
        context.type = 'employee'
        context.userId = user.get('id')
      }
      if (user.get('language')) {
        context.userLanguage = user.get('language')
      }

// After
      if (user.get('id')) {
        context.type = 'employee'
        context.userId = user.get('id')
      }

      if (user.get('language')) {
        context.userLanguage = user.get('language')
      }

• import/no-relative-parent-imports

See https://github.com/benmosher/eslint-plugin-import/blob/master/docs/rules/no-relative-parent-imports.md

💡 eslint can fix almost all new rules for you: eslint . --fix