README.md

eslint-plugin-ember

An ESlint plugin that provides set of rules for Ember Applications based on commonly known good practices.

❗️Requirements

• ESLint >= 5
• Node.js >= 8

🚀 Usage

1. Install plugin

yarn add --dev eslint-plugin-ember

Or

npm install --save-dev eslint-plugin-ember

2. Modify your .eslintrc.js

// .eslintrc.js
module.exports = {
  plugins: ['ember'],
  extends: [
    'eslint:recommended',
    'plugin:ember/recommended' // or other configuration
  ],
  rules: {
    // override rule settings here
    'ember/no-jquery': 'error'
  }
};

🧰 Configurations

	Name	Description
	base	contains no rules settings, but the basic eslint configuration suitable for any ember project. You can use it to configure rules as you wish.
✅	recommended	extends the base configuration by enabling the recommended rules.
🚗	octane	extends the recommended configuration by enabling octane rules. This ruleset is currently considered unstable and experimental ⚠️ as rules may be added and removed until the final ruleset is settled upon.

🍟 Rules

Rules are grouped by category to help you understand their purpose. Each rule has emojis denoting:

• What configuration it belongs to
• 🔧 if some problems reported by the rule are automatically fixable by the --fix command line option

Best Practices

	Rule ID	Description
	alias-model-in-controller	enforce aliasing model in controllers
✅	avoid-using-needs-in-controllers	disallow using needs in controllers
✅	closure-actions	enforce usage of closure actions
	named-functions-in-promises	enforce usage of named functions in promises
✅	new-module-imports	enforce using "New Module Imports" from Ember RFC #176
	no-controllers	disallow non-essential controllers
✅	no-function-prototype-extensions	disallow usage of Ember's function prototype extensions
🚗	no-get-with-default	disallow usage of the Ember's getWithDefault function
🚗🔧	no-get	require using ES5 getters instead of Ember's get / getProperties functions
✅	no-global-jquery	disallow usage of global jQuery object
🚗	no-jquery	disallow any usage of jQuery
	no-mixins	disallow the usage of mixins
✅	no-new-mixins	disallow the creation of new mixins
✅	no-observers	disallow usage of observers
✅🔧	no-old-shims	disallow usage of old shims for modules
✅	no-on-calls-in-components	disallow usage of on to call lifecycle hooks in components
	no-private-routing-service	disallow injecting the private routing service
✅	no-restricted-resolver-tests	disallow the use of patterns that use the restricted resolver in tests
	no-unnecessary-index-route	disallow unnecessary index route definition
✅🔧	no-unnecessary-route-path-option	disallow unnecessary usage of the route path option
🔧	no-unnecessary-service-injection-argument	disallow unnecessary argument when injecting services
✅	no-volatile-computed-properties	disallow volatile computed properties
🔧	require-computed-macros	require using computed property macros when possible
	route-path-style	enforce usage of kebab-case (instead of snake_case or camelCase) in route paths
🔧	use-ember-get-and-set	enforce usage of Ember.get and Ember.set

Ember Object

	Rule ID	Description
✅	avoid-leaking-state-in-ember-objects	disallow state leakage
🚗	classic-decorator-hooks	enforce using correct hooks for both classic and non-classic classes
🚗	classic-decorator-no-classic-methods	disallow usage of classic APIs such as get/set in classes that aren't explicitly decorated with @classic
	computed-property-getters	enforce the consistent use of getters in computed properties
	no-proxies	disallow using array or object proxies

Possible Errors

	Rule ID	Description
✅	jquery-ember-run	disallow usage of jQuery without an Ember run loop
✅	no-arrow-function-computed-properties	disallow arrow functions in computed properties
✅	no-attrs-in-components	disallow usage of this.attrs in components
✅	no-attrs-snapshot	disallow use of attrs snapshot in the didReceiveAttrs and didUpdateAttrs hooks
✅	no-capital-letters-in-routes	disallow routes with uppercased letters in router.js
✅	no-deeply-nested-dependent-keys-with-each	disallow usage of deeply-nested computed property dependent keys with @each
✅	no-duplicate-dependent-keys	disallow repeating computed property dependent keys
✅🔧	no-ember-super-in-es-classes	disallow use of this._super in ES class methods
✅	no-ember-testing-in-module-scope	disallow use of Ember.testing in module scope
✅	no-incorrect-calls-with-inline-anonymous-functions	disallow inline anonymous functions as arguments to debounce, once, and scheduleOnce
✅	no-invalid-debug-function-arguments	disallow usages of Ember's assert() / warn() / deprecate() functions that have the arguments passed in the wrong order.
✅	no-side-effects	disallow unexpected side effects in computed properties
🔧	require-computed-property-dependencies	require dependencies to be declared statically in computed properties
✅	require-return-from-computed	disallow missing return statements in computed properties
✅	require-super-in-init	require this._super to be called in init hooks
✅	routes-segments-snake-case	enforce usage of snake_cased dynamic segments in routes

Ember Octane

	Rule ID	Description
🚗	no-actions-hash	disallow the actions hash in components, controllers, and routes
🚗	no-classic-classes	disallow "classic" classes in favor of native JS classes
🚗	no-classic-components	enforce using Glimmer components
🚗	no-component-lifecycle-hooks	disallow usage of "classic" ember component lifecycle hooks. Render modifiers or custom functional modifiers should be used instead.
🚗	no-computed-properties-in-native-classes	disallow using computed properties in native classes
🚗	require-tagless-components	disallow using the wrapper element of a component

Ember Data

	Rule ID	Description
	no-empty-attrs	disallow usage of empty attributes in Ember Data models
🔧	use-ember-data-rfc-395-imports	enforce usage of @ember-data/ packages instead ember-data

Testing

	Rule ID	Description
	no-legacy-test-waiters	disallow the use of the legacy test waiter APIs.
	no-pause-test	disallow usage of the pauseTest helper in tests
	no-test-and-then	disallow usage of the andThen test wait helper
	no-test-import-export	disallow importing of "-test.js" in a test file and exporting from a test file
	no-test-module-for	disallow usage of moduleFor, moduleForComponent, etc

Stylistic Issues

	Rule ID	Description
🔧	order-in-components	enforce proper order of properties in components
🔧	order-in-controllers	enforce proper order of properties in controllers
🔧	order-in-models	enforce proper order of properties in models
🔧	order-in-routes	enforce proper order of properties in routes
✅	use-brace-expansion	enforce usage of brace expansion in computed property dependent keys

For the simplified list of rules, go here.

🍻 Contribution Guide

If you have any suggestions, ideas, or problems, feel free to create an issue, but first please make sure your question does not repeat previous ones.

Creating a New Rule

• Create an issue with a description of the proposed rule
• Create files for the new rule:
  • lib/rules/new-rule.js (implementation, see no-proxies for an example)
  • docs/rules/new-rule.md (documentation, start from the template -- raw, rendered)
  • tests/lib/rules/new-rule.js (tests, see no-proxies for an example)
• Run yarn update to automatically update the README and other files (and re-run this if you change the rule name or description)
• Make sure your changes will pass CI by running:
  • yarn test
  • yarn lint (yarn lint:js --fix can fix many errors)
• Create a PR and link the created issue in the description

Note that new rules should not immediately be added to the recommended configuration, as we only consider such breaking changes during major version updates.

🔓 License

See the LICENSE file for license rights and limitations (MIT).