fix(autocomplete,cascadeselect,dataview): enable generic type inference for options and slots

[YevheniiKotyrlo]

Defect Fixes

Fixes #8486

AutoComplete, CascadeSelect, and DataView use any for their data arrays, slot scoped data, and event payloads. Developers get no type safety when working with suggestion/option slots or option-select events.

Same root cause as #8442 — DefineComponent's no-arg constructor prevents generic inference. Same fix pattern as #8444 (DataTable/DatePicker).

Related: #7426, #6041

Reproducer: StackBlitz — bun run type-check (0 errors, typo undetected) → bun run patch && bun run type-check (TS2339 catches it)

Problem

<AutoComplete :suggestions="users" optionLabel="name">
  <template #option="{ option }">
    {{ option.naem }}
    <!-- No error — `option` is `any`, typo ships to production -->
  </template>
</AutoComplete>

After this fix, TypeScript infers T from the data binding and flows it to all slots and events:

<AutoComplete :suggestions="users" optionLabel="name">
  <template #option="{ option }">
    {{ option.naem }}
    <!-- TS2339: Property 'naem' does not exist on type 'User' -->
  </template>
</AutoComplete>

Event handlers also benefit — option-select and option-unselect now carry the inferred type:

const handleSelect = (event: AutoCompleteOptionSelectEvent<User>) => {
  console.log(event.value.name); // fully typed
};

Changes

AutoComplete and CascadeSelect:

• [Component]Props<T = any> — suggestions/options: T[], callback params (data: T) => ...
• [Component]Slots<T = any> — option: T, suggestions/options: T[] in header/footer slots
• Generic constructor: new <T = any>(props) with $slots, $emit both wired to T
• modelValue stays any — when optionValue is set, the value is the extracted scalar, not the option object

AutoComplete events (additional):

• AutoCompleteOptionSelectEvent<T = any> — value: T instead of value: any
• AutoCompleteOptionUnselectEvent<T = any> — extends generic select event
• AutoCompleteEmitsOptions<T = any> — select/unselect emits use generic event types
• AutoCompleteEmits<T = any> — propagates T through EmitFn

DataView:

• DataViewProps<T> already exists with value: T[] — props were already generic from a previous PR
• DataViewSlots<T = unknown> — wires existing T to list and grid slot items: T[]
• Generic constructor replaces DefineComponent — completing the generic plumbing that was left half-done

What gets typed

Slot/Callback/Event	Before	After
AutoComplete #option slot option	any	T
AutoComplete #header / #footer slot suggestions	any[]	T[]
AutoComplete optionLabel callback param	any	T
AutoComplete option-select event value	any	T
AutoComplete option-unselect event value	any	T
CascadeSelect #option slot option	any	T
CascadeSelect #header / #footer slot options	any[]	T[]
CascadeSelect optionLabel/optionValue/optionDisabled callback param	any	T
DataView #list / #grid slot items	any	T[]

Scope / Impact

• No breaking changes — backward compatible, T defaults to any
• No runtime changes — types only (.d.ts files)
• 3 components: AutoComplete, CascadeSelect, DataView

Verification

Gate	Result
pnpm run format:check	PASS
pnpm run lint	PASS
pnpm run test:unit	Pre-existing failures only, 0 new
pnpm run build:packages	PASS

Series

This is part of a series bringing generic type inference to all PrimeVue data components:

PR	Components	Status
#8444	DataTable, DatePicker	Open
#8484	Select, MultiSelect, Listbox	Open
#8485	Column (phantom of prop)	Open
#8489	AutoComplete, CascadeSelect, DataView	This PR
#8490	Carousel, Galleria, Timeline	Open
#8491	OrderList, PickList	Open
#8493	VirtualScroller, SelectButton, InputChips	Open

After this series, every PrimeVue component with a collection prop will infer T from the binding and flow it to slots and events — giving developers full IDE autocomplete and compile-time type safety in templates.