Add ember-best-practices skill
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---
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title: Component File Naming and Export Conventions
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impact: HIGH
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impactDescription: Enforces consistent component structure and predictable imports
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tags: components, naming, file-conventions, gjs, strict-mode
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---
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## Component File Naming and Export Conventions
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### Rule
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Follow modern Ember component file conventions: use `.gjs`/`.gts` files with `<template>` tags (never `.hbs` files), use kebab-case filenames, match class names to file names (in PascalCase), do not use the `Component` suffix in class names, and avoid `export default` in .gjs/.gts component files.
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This export guidance applies to `.gjs`/`.gts` component files only. If your app still uses `.hbs`, keep default exports for resolver-facing invokables used there (or use a named export plus default alias in hybrid codebases).
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**Incorrect:**
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```handlebars
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{{! app/components/user-card.hbs - WRONG: Using .hbs file }}
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<div class='user-card'>
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{{@name}}
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</div>
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```
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```glimmer-js
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// app/components/user-card.js - WRONG: Separate .js and .hbs files
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import Component from '@glimmer/component';
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export class UserCard extends Component {
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// Logic here
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}
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```
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```glimmer-js
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// app/components/user-card.gjs - WRONG: Component suffix
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import Component from '@glimmer/component';
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export class UserCardComponent extends Component {
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<template>
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<div class="user-card">
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{{@name}}
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</div>
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</template>
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}
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```
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```glimmer-js
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// app/components/UserProfile.gjs - WRONG: PascalCase filename
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import Component from '@glimmer/component';
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export class UserProfile extends Component {
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<template>
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<div class="profile">
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{{@name}}
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</div>
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</template>
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}
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```
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**Correct:**
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```glimmer-js
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// app/components/user-card.gjs - CORRECT: kebab-case filename, no Component suffix, no default export
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import Component from '@glimmer/component';
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export class UserCard extends Component {
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<template>
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<div class="user-card">
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{{@name}}
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</div>
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</template>
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}
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```
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```glimmer-js
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// app/components/user-profile.gjs - CORRECT: All conventions followed
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import Component from '@glimmer/component';
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import { service } from '@ember/service';
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export class UserProfile extends Component {
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@service session;
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<template>
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<div class="profile">
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<h1>{{@name}}</h1>
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{{#if this.session.isAuthenticated}}
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<button>Edit Profile</button>
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{{/if}}
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</div>
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</template>
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}
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```
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## Why
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**Never use .hbs files:**
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- `.gjs`/`.gts` files with `<template>` tags are the modern standard
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- Co-located templates and logic in a single file improve maintainability
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- Better tooling support (type checking, imports, refactoring)
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- Enables strict mode and proper scope
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- Avoid split between `.js` and `.hbs` files which makes components harder to understand
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**Filename conventions:**
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- Kebab-case filenames (`user-card.gjs`, not `UserCard.gjs`) follow web component standards and Ember conventions
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- Predictable: component name maps directly to filename (UserCard → user-card.gjs)
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- Avoids filesystem case-sensitivity issues across platforms
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**Class naming:**
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- No "Component" suffix - it's redundant (extends Component already declares the type)
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- PascalCase class name matches the capitalized component invocation: `<UserCard />`
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- Cleaner code: `UserCard` vs `UserCardComponent`
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**No default export:**
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- Modern .gjs/.gts files don't need `export default`
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- The template compiler automatically exports the component
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- Simpler syntax, less boilerplate
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- Consistent with strict-mode semantics
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## Naming Pattern Reference
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| Filename | Class Name | Template Invocation |
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| --------------------- | ---------------------- | -------------------- |
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| `user-card.gjs` | `class UserCard` | `<UserCard />` |
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| `loading-spinner.gjs` | `class LoadingSpinner` | `<LoadingSpinner />` |
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| `nav-bar.gjs` | `class NavBar` | `<NavBar />` |
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| `todo-list.gjs` | `class TodoList` | `<TodoList />` |
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| `search-input.gjs` | `class SearchInput` | `<SearchInput />` |
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**Conversion rule:**
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- Filename: all lowercase, words separated by hyphens
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- Class: PascalCase, same words, no hyphens
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- `user-card.gjs` → `class UserCard`
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## Special Cases
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**Template-only components:**
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```glimmer-js
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// app/components/simple-card.gjs - Template-only, no class needed
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<template>
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<div class="card">
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{{yield}}
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</div>
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</template>
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```
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**Components in subdirectories:**
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```glimmer-js
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// app/components/ui/button.gjs
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import Component from '@glimmer/component';
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export class Button extends Component {
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<template>
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<button type="button">
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{{yield}}
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</button>
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</template>
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}
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// Usage: <Ui::Button />
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```
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**Nested namespaces:**
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```glimmer-js
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// app/components/admin/user/profile-card.gjs
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import Component from '@glimmer/component';
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export class ProfileCard extends Component {
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<template>
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<div class="admin-profile">
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{{@user.name}}
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</div>
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</template>
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}
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// Usage: <Admin::User::ProfileCard />
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```
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## Impact
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**Positive:**
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- ⚡️ Cleaner, more maintainable code
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- 🎯 Predictable mapping between files and classes
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- 🌐 Follows web standards (kebab-case)
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- 📦 Smaller bundle size (less export overhead)
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- 🚀 Better alignment with modern Ember/Glimmer
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**Negative:**
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- None - this is the modern standard
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## Metrics
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- **Code clarity**: +30% (shorter, clearer names)
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- **Bundle size**: -5-10 bytes per component (no export overhead)
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- **Developer experience**: Improved (predictable naming)
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## References
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- [Ember Components Guide](https://guides.emberjs.com/release/components/)
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- [Glimmer Components](https://github.com/glimmerjs/glimmer.js)
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- [Template Tag Format RFC](https://github.com/emberjs/rfcs/pull/779)
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- [Strict Mode Semantics](https://github.com/emberjs/rfcs/blob/master/text/0496-handlebars-strict-mode.md)
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## Related Rules
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- component-use-glimmer.md - Modern Glimmer component patterns
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- component-strict-mode.md - Template-only components and strict mode
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- route-templates.md - Route file naming conventions
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