Defined in: batcher.ts:145

A class that collects items and processes them in batches.

Batching is a technique for grouping multiple operations together to be processed as a single unit. This synchronous version is lighter weight and often all you need - upgrade to AsyncBatcher when you need promises, retry support, abort/cancel capabilities, or advanced error handling.

The Batcher provides a flexible way to implement batching with configurable:

• Maximum batch size (number of items per batch)
• Time-based batching (process after X milliseconds)
• Custom batch processing logic via getShouldExecute
• Event callbacks for monitoring batch operations

State Management:

• Uses TanStack Store for reactive state management
• Use initialState to provide initial state values when creating the batcher
• Use onExecute callback to react to batch execution and implement custom logic
• Use onItemsChange callback to react to items being added or removed from the batcher
• The state includes batch execution count, total items processed, items, and running status
• State can be accessed via batcher.store.state when using the class directly
• When using framework adapters (React/Solid), state is accessed from batcher.state

const batcher = new Batcher<number>(
  (items) => console.log('Processing batch:', items),
  {
    maxSize: 5,
    wait: 2000,
    onExecute: (batch, batcher) => console.log('Batch executed:', batch)
  }
);

batcher.addItem(1);
batcher.addItem(2);
// After 2 seconds or when 5 items are added, whichever comes first,
// the batch will be processed
// batcher.flush() // manually trigger a batch

const batcher = new Batcher<number>(
  (items) => console.log('Processing batch:', items),
  {
    maxSize: 5,
    wait: 2000,
    onExecute: (batch, batcher) => console.log('Batch executed:', batch)
  }
);

batcher.addItem(1);
batcher.addItem(2);
// After 2 seconds or when 5 items are added, whichever comes first,
// the batch will be processed
// batcher.flush() // manually trigger a batch

• TValue

new Batcher<TValue>(fn, initialOptions): Batcher<TValue>

new Batcher<TValue>(fn, initialOptions): Batcher<TValue>

Defined in: batcher.ts:153

(items) => void

BatcherOptions<TValue>

Batcher<TValue>

fn: (items) => void;

fn: (items) => void;

Defined in: batcher.ts:154

TValue[]

void

key: string;

key: string;

Defined in: batcher.ts:149

options: BatcherOptionsWithOptionalCallbacks<TValue>;

options: BatcherOptionsWithOptionalCallbacks<TValue>;

Defined in: batcher.ts:150

readonly store: Store<Readonly<BatcherState<TValue>>>;

readonly store: Store<Readonly<BatcherState<TValue>>>;

Defined in: batcher.ts:146

_emit(): void

_emit(): void

Defined in: batcher.ts:174

Emits a change event for the batcher instance. Mostly useful for devtools.

void

addItem(item): void

addItem(item): void

Defined in: batcher.ts:210

Adds an item to the batcher If the batch size is reached, timeout occurs, or shouldProcess returns true, the batch will be processed

TValue

void

cancel(): void

cancel(): void

Defined in: batcher.ts:288

Cancels any pending execution that was scheduled. Does NOT clear out the items.

void

clear(): void

clear(): void

Defined in: batcher.ts:280

Removes all items from the batcher

void

flush(): void

flush(): void

Defined in: batcher.ts:258

Processes the current batch of items immediately

void

peekAllItems(): TValue[]

peekAllItems(): TValue[]

Defined in: batcher.ts:266

Returns a copy of all items in the batcher

TValue[]

reset(): void

reset(): void

Defined in: batcher.ts:296

Resets the batcher state to its default values

void

setOptions(newOptions): void

setOptions(newOptions): void

Defined in: batcher.ts:179

Updates the batcher options

Partial<BatcherOptions<TValue>>

void