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
2. Full API with all modifiers (.once, .half, .full, .threshold.X, .margin.Xpx)
3. Usage patterns and examples
4. Comparison with Alpine's x-intersect

5. Suggested location: New docs page or section in wire-* directives

6. data-loading attribute

7. Automatic addition to elements that trigger requests
8. Styling examples and use cases

9. Suggested location: Section in wire-loading.md or actions.md

10. wire:preserve-scroll modifier

11. How it works and when to use it
12. Examples of preventing layout jumps

13. Suggested location: Actions.md or new wire-preserve-scroll.md

14. $errors magic property in JavaScript

15. Full API (.has(), .first(), .all(), etc.)
16. Integration with Alpine

17. Suggested location: Forms.md or validation.md

18. $island() magic action

19. Calling island renders from templates
20. Passing modes and options

21. Suggested location: Islands.md (add a section)

22. $wire.$intercept() magic

23. Full API and callback structure
24. Use cases and examples

25. Suggested location: JavaScript.md (interceptors section)

26. JavaScript modules in view-based components

27. How <script> tags work without @script wrapper
28. Automatic $wire binding as this
29. Module caching and performance benefits

30. Suggested location: Components.md or JavaScript.md

31. CSP-safe mode restrictions

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

Medium Priority

1. Slots and attribute forwarding
2. Complete guide on using slots in components
3. {{ $attributes }} usage and examples

4. Suggested location: Components.md

5. 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

6. Component namespaces

   • How to use namespaced components
   • Examples: <livewire:pages::dashboard />
   • Suggested location: Components.md

7. 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