README.md

eslint-plugin-ember

An ESLint plugin that provides a set of rules for Ember applications based on commonly known good practices.

❗️Requirements

• ESLint >= 7
• Node.js 14.* || 16.* || >= 18

🚀 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 / enable optional rules
    'ember/no-replace-test-comments': 'error'
  }
};

🧰 Configurations

	Name	Description
✅	recommended	enables the recommended rules

🍟 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
• 💡 if some problems reported by the rule are manually fixable by editor suggestions

Components

Name	Description	✅	🔧	💡
no-attrs-in-components	disallow usage of this.attrs in components	✅
no-attrs-snapshot	disallow use of attrs snapshot in the didReceiveAttrs and didUpdateAttrs component hooks	✅
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-on-calls-in-components	disallow usage of on to call lifecycle hooks in components	✅
require-tagless-components	disallow using the wrapper element of a component	✅

Computed Properties

Name	Description	✅	🔧	💡
computed-property-getters	enforce the consistent use of getters in computed properties
no-arrow-function-computed-properties	disallow arrow functions in computed properties	✅
no-assignment-of-untracked-properties-used-in-tracking-contexts	disallow assignment of untracked properties that are used as computed property dependencies	✅	🔧
no-computed-properties-in-native-classes	disallow using computed properties in native classes	✅
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-incorrect-computed-macros	disallow incorrect usage of computed property macros	✅	🔧
no-invalid-dependent-keys	disallow invalid dependent keys in computed properties	✅	🔧
no-side-effects	disallow unexpected side effects in computed properties	✅
no-volatile-computed-properties	disallow volatile computed properties	✅
require-computed-macros	require using computed property macros when possible	✅	🔧
require-computed-property-dependencies	require dependencies to be declared statically in computed properties	✅	🔧
require-return-from-computed	disallow missing return statements in computed properties	✅
use-brace-expansion	enforce usage of brace expansion in computed property dependent keys	✅

Controllers

Name	Description	✅	🔧	💡
alias-model-in-controller	enforce aliasing model in controllers
avoid-using-needs-in-controllers	disallow using needs in controllers	✅
no-controllers	disallow non-essential controllers

Deprecations

Name	Description	✅	🔧	💡
closure-actions	enforce usage of closure actions	✅
new-module-imports	enforce using "New Module Imports" from Ember RFC #176	✅
no-array-prototype-extensions	disallow usage of Ember's Array prototype extensions	✅
no-function-prototype-extensions	disallow usage of Ember's function prototype extensions	✅
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-string-prototype-extensions	disallow usage of String prototype extensions	✅

Ember Data

Name	Description	✅	🔧	💡
no-empty-attrs	disallow usage of empty attributes in Ember Data models
use-ember-data-rfc-395-imports	enforce usage of @ember-data/ package imports instead ember-data	✅	🔧

Ember Object

Name	Description	✅	🔧	💡
avoid-leaking-state-in-ember-objects	disallow state leakage	✅
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-proxies	disallow using array or object proxies
no-try-invoke	disallow usage of the Ember's tryInvoke util	✅
require-super-in-lifecycle-hooks	require super to be called in lifecycle hooks	✅	🔧
use-ember-get-and-set	enforce usage of Ember.get and Ember.set		🔧

Ember Octane

Name	Description	✅	🔧	💡
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	✅
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-ember-super-in-es-classes	disallow use of this._super in ES class methods	✅	🔧
no-empty-glimmer-component-classes	disallow empty backing classes for Glimmer components	✅

jQuery

Name	Description	✅	🔧	💡
jquery-ember-run	disallow usage of jQuery without an Ember run loop	✅
no-global-jquery	disallow usage of global jQuery object	✅
no-jquery	disallow any usage of jQuery	✅

Miscellaneous

Name	Description	✅	🔧	💡
named-functions-in-promises	enforce usage of named functions in promises
no-html-safe	disallow the use of htmlSafe
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-restricted-property-modifications	disallow modifying the specified properties		🔧
require-fetch-import	enforce explicit import for fetch()

Routes

Name	Description	✅	🔧	💡
no-capital-letters-in-routes	disallow routes with uppercased letters in router.js	✅
no-controller-access-in-routes	disallow routes from accessing the controller outside of setupController/resetController	✅
no-private-routing-service	disallow injecting the private routing service	✅
no-shadow-route-definition	enforce no route path definition shadowing	✅
no-unnecessary-index-route	disallow unnecessary index route definition
no-unnecessary-route-path-option	disallow unnecessary usage of the route path option	✅	🔧
route-path-style	enforce usage of kebab-case (instead of snake_case or camelCase) in route paths			💡
routes-segments-snake-case	enforce usage of snake_cased dynamic segments in routes	✅

Services

Name	Description	✅	🔧	💡
no-implicit-service-injection-argument	disallow omitting the injected service name argument		🔧
no-restricted-service-injections	disallow injecting certain services under certain paths
no-unnecessary-service-injection-argument	disallow unnecessary argument when injecting services		🔧
no-unused-services	disallow unused service injections (see rule doc for limitations)			💡

Stylistic Issues

Name	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		🔧

Testing

Name	Description	✅	🔧	💡
no-current-route-name	disallow usage of the currentRouteName() test helper
no-ember-testing-in-module-scope	disallow use of Ember.testing in module scope	✅
no-invalid-test-waiters	disallow incorrect usage of test waiter APIs	✅
no-legacy-test-waiters	disallow the use of the legacy test waiter APIs	✅
no-noop-setup-on-error-in-before	disallows using no-op setupOnerror in before or beforeEach	✅	🔧
no-pause-test	disallow usage of the pauseTest helper in tests	✅
no-replace-test-comments	disallow 'Replace this with your real tests' comments in test files
no-restricted-resolver-tests	disallow the use of patterns that use the restricted resolver in tests	✅
no-settled-after-test-helper	disallow usage of await settled() right after test helper that calls it internally	✅	🔧
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	✅
no-test-support-import	disallow importing of "test-support" files in production code.	✅
no-test-this-render	disallow usage of the this.render in tests, recommending to use @ember/test-helpers' render instead.	✅
prefer-ember-test-helpers	enforce usage of @ember/test-helpers methods over native window methods	✅
require-valid-css-selector-in-test-helpers	disallow using invalid CSS selectors in test helpers	✅	🔧

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).