createQueuedState

function createQueuedState<TValue, TSelected>(
   host,
   fn,
   options?,
   selector?): [() => TValue[], (item, position?, runOnItemsChange?) => boolean, LitQueuer<TValue, TSelected>];

Defined in: queuer/createQueuedState.ts:35

Exposes pending queue items together with the queue that processes them.

Retains accepted items until processing. Ordering, capacity, wait, and started options follow the underlying queue.

Return value

Returns [itemsAccessor, addItem, queue]. Call itemsAccessor() to read pending items.

State and ownership

Items are selected by default. A custom selector must retain items and may add other state fields. The returned collection contains pending items; async active items are separate.

Pass the owning ReactiveControllerHost first. Host updates refresh options. Disconnecting runs cleanup; reconnecting restores subscriptions to the same utility. Options accept an object with top-level getters or an options factory. Function-valued core options remain callbacks. Local options override provider defaults without replacing the utility or its pending work. onUnmount replaces default cleanup and receives the utility instance. A custom callback must perform every needed cancel, stop, or abort action.

Type Parameters

TValue

TSelected

TSelected extends Pick<QueuerState<TValue>, "items"> = Pick<QueuerState<TValue>, "items">

Parameters

host

ReactiveControllerHost

fn

(item) => void

options?

LitPacerOptions<LitQueuerOptions<TValue, TSelected>> = {}

selector?

(state) => TSelected

Returns

[() => TValue[], (item, position?, runOnItemsChange?) => boolean, LitQueuer<TValue, TSelected>]

Example

import { createQueuedState } from '@tanstack/lit-pacer'

// In a LitElement constructor:
const [items, addItem, queue] = createQueuedState(this, (item: number) => { console.log(item) }, { wait: 500 })
addItem(1)
console.log(items())