Undocumented Features Found During v4 Upgrade Guide

These features exist in v4 but may need dedicated documentation pages or sections:

High Priority

1. wire:intersect directive

- Full API with all modifiers (.once, .half, .full, .threshold.X, .margin.Xpx) - Usage patterns and examples - Comparison with Alpine's x-intersect - Suggested location: New docs page or section in wire-* directives

1. data-loading attribute

- Automatic addition to elements that trigger requests - Styling examples and use cases - Suggested location: Section in wire-loading.md or actions.md

1. wire:preserve-scroll modifier

- How it works and when to use it - Examples of preventing layout jumps - Suggested location: Actions.md or new wire-preserve-scroll.md

1. $errors magic property in JavaScript

- Full API (.has(), .first(), .all(), etc.) - Integration with Alpine - Suggested location: Forms.md or validation.md

1. $island() magic action

- Calling island renders from templates - Passing modes and options - Suggested location: Islands.md (add a section)

1. $wire.$intercept() magic

- Full API and callback structure - Use cases and examples - Suggested location: JavaScript.md (interceptors section)

1. JavaScript modules in view-based components

- How <script> tags work without @script wrapper - Automatic $wire binding as this - Module caching and performance benefits - Suggested location: Components.md or JavaScript.md

1. CSP-safe mode restrictions

- Complete list of what expressions are not allowed - Migration guide for existing apps - Workarounds and alternatives - Suggested location: New security.md section or dedicated csp.md page

Medium Priority

1. Slots and attribute forwarding

- Complete guide on using slots in components - {{ $attributes }} usage and examples - Suggested location: Components.md

1. Smart wire:key automatic generation

- How it works behind the scenes

- When you still need manual wire:key

- Suggested location: Nesting.md or components.md

1. Component namespaces

- How to use namespaced components

- Examples: <livewire:pages::dashboard />

- Suggested location: Components.md

1. Fragment morph hooks

- Livewire.hook('fragment.morph', ...) and fragment.morphed

- When to use vs regular morph hooks

- Suggested location: JavaScript.md (hooks section)

Existing Docs to Update

• lazy.md - Already updated with defer and bundle features
• actions.md - Already updated with async actions
• islands.md - Already updated with renderIsland/streamIsland
• components.md - Already updated with convert command
• wire-sort.md - Already created and documented

Notes

• Most of these features exist in the codebase but aren't mentioned in user-facing docs
• Some may be intentionally undocumented for now (beta features)
• Priority is based on likely user impact and common use cases