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---
name: livewire-development
description: >-
Develops reactive Livewire 4 components. Activates when creating, updating, or modifying
Livewire components; working with wire:model, wire:click, wire:loading, or any wire: directives;
adding real-time updates, loading states, or reactivity; debugging component behavior;
writing Livewire tests; or when the user mentions Livewire, component, counter, or reactive UI.
---
# Livewire Development
## When to Apply
Activate this skill when:
- Creating or modifying Livewire components
- Using wire: directives (model, click, loading, sort, intersect)
- Implementing islands or async actions
- Writing Livewire component tests
## Documentation
Use `search-docs` for detailed Livewire 4 patterns and documentation.
## Basic Usage
### Creating Components
<code-snippet name="Component Creation Commands" lang="bash">
# Single-file component (default in v4)
{{ $assist->artisanCommand('make:livewire create-post') }}
# Multi-file component
{{ $assist->artisanCommand('make:livewire create-post --mfc') }}
# Class-based component (v3 style)
{{ $assist->artisanCommand('make:livewire create-post --class') }}
# With namespace
{{ $assist->artisanCommand('make:livewire Posts/CreatePost') }}
</code-snippet>
### Converting Between Formats
Use `php artisan livewire:convert create-post` to convert between single-file, multi-file, and class-based formats.
### Component Format Reference
| Format | Flag | Structure |
|--------|------|-----------|
| Single-file (SFC) | default | PHP + Blade in one file |
| Multi-file (MFC) | `--mfc` | Separate PHP class, Blade, JS, tests |
| Class-based | `--class` | Traditional v3 style class |
| View-based | ⚡ prefix | Blade-only with functional state |
### Single-File Component Example
<code-snippet name="Single-File Component Example" lang="php">
<?php
use Livewire\Component;
new class extends Component {
public int $count = 0;
public function increment(): void
{
$this->count++;
}
}
?>
<div>
<button wire:click="increment">Count: @{{ $count }}</button>
</div>
</code-snippet>
## Livewire 4 Specifics
### Key Changes From Livewire 3
These things changed in Livewire 4, but may not have been updated in this application. Verify this application's setup to ensure you follow existing conventions.
- Use `Route::livewire()` for full-page components; config keys renamed: `layout``component_layout`, `lazy_placeholder``component_placeholder`.
- `wire:model` now ignores child events by default (use `wire:model.deep` for old behavior); `wire:scroll` renamed to `wire:navigate:scroll`.
- Component tags must be properly closed; `wire:transition` now uses View Transitions API (modifiers removed).
- JavaScript: `$wire.$js('name', fn)``$wire.$js.name = fn`; `commit`/`request` hooks → `interceptMessage()`/`interceptRequest()`.
### New Features
- Component formats: single-file (SFC), multi-file (MFC), view-based components.
- Islands (`@island`) for isolated updates; async actions (`wire:click.async`, `#[Async]`) for parallel execution.
- Deferred/bundled loading: `defer`, `lazy.bundle` for optimized component loading.
| Feature | Usage | Purpose |
|---------|-------|---------|
| Islands | `@island(name: 'stats')` | Isolated update regions |
| Async | `wire:click.async` or `#[Async]` | Non-blocking actions |
| Deferred | `defer` attribute | Load after page render |
| Bundled | `lazy.bundle` | Load multiple together |
### New Directives
- `wire:sort`, `wire:intersect`, `wire:ref`, `.renderless`, `.preserve-scroll` are available for use.
- `data-loading` attribute automatically added to elements triggering network requests.
| Directive | Purpose |
|-----------|---------|
| `wire:sort` | Drag-and-drop sorting |
| `wire:intersect` | Viewport intersection detection |
| `wire:ref` | Element references for JS |
| `.renderless` | Component without rendering |
| `.preserve-scroll` | Preserve scroll position |
## Best Practices
- Always use `wire:key` in loops
- Use `wire:loading` for loading states
- Use `wire:model.live` for instant updates (default is debounced)
- Validate and authorize in actions (treat like HTTP requests)
## Configuration
- `smart_wire_keys` defaults to `true`; new configs: `component_locations`, `component_namespaces`, `make_command`, `csp_safe`.
## Alpine & JavaScript
- `wire:transition` uses browser View Transitions API; `$errors` and `$intercept` magic properties available.
- Non-blocking `wire:poll` and parallel `wire:model.live` updates improve performance.
For interceptors and hooks, see [reference/javascript-hooks.md](reference/javascript-hooks.md).
## Testing
<code-snippet name="Testing Example" lang="php">
Livewire::test(Counter::class)
->assertSet('count', 0)
->call('increment')
->assertSet('count', 1);
</code-snippet>
## Verification
1. Browser console: Check for JS errors
2. Network tab: Verify Livewire requests return 200
3. Ensure `wire:key` on all `@foreach` loops
## Common Pitfalls
- Missing `wire:key` in loops → unexpected re-rendering
- Expecting `wire:model` real-time → use `wire:model.live`
- Unclosed component tags → syntax errors in v4
- Using deprecated config keys or JS hooks
- Including Alpine.js separately (already bundled in Livewire 4)

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# Livewire 4 JavaScript Integration
## Interceptor System (v4)
### Intercept Messages
```js
Livewire.interceptMessage(({ component, message, onFinish, onSuccess, onError }) => {
onFinish(() => { /* After response, before processing */ });
onSuccess(({ payload }) => { /* payload.snapshot, payload.effects */ });
onError(() => { /* Server errors */ });
});
```
### Intercept Requests
```js
Livewire.interceptRequest(({ request, onResponse, onSuccess, onError, onFailure }) => {
onResponse(({ response }) => { /* When received */ });
onSuccess(({ response, responseJson }) => { /* Success */ });
onError(({ response, responseBody, preventDefault }) => { /* 4xx/5xx */ });
onFailure(({ error }) => { /* Network failures */ });
});
```
### Component-Scoped Interceptors
```blade
<script>
this.$intercept('save', ({ component, onSuccess }) => {
onSuccess(() => console.log('Saved!'));
});
</script>
```
## Magic Properties
- `$errors` - Access validation errors from JavaScript
- `$intercept` - Component-scoped interceptors