📄 tanstack/pacer/latest/docs/framework/react/reference/functions/useThrottler

function useThrottler<TFn, TSelected>(
   fn, 
   options, 
selector): ReactThrottler<TFn, TSelected>;


function useThrottler<TFn, TSelected>(
   fn, 
   options, 
selector): ReactThrottler<TFn, TSelected>;

Defined in: react-pacer/src/throttler/useThrottler.ts:108

A low-level React hook that creates a Throttler instance that limits how often the provided function can execute.

This hook is designed to be flexible and state-management agnostic - it simply returns a throttler instance that you can integrate with any state management solution (useState, Redux, Zustand, Jotai, etc). For a simpler and higher-level hook that integrates directly with React's useState, see useThrottledState.

Throttling ensures a function executes at most once within a specified time window, regardless of how many times it is called. This is useful for rate-limiting expensive operations or UI updates.

State Management and Selector
-----------------------------

The hook uses TanStack Store for reactive state management. The selector parameter allows you to specify which state changes will trigger a re-render, optimizing performance by preventing unnecessary re-renders when irrelevant state changes occur.

By default, there will be no reactive state subscriptions and you must opt-in to state tracking by providing a selector function. This prevents unnecessary re-renders and gives you full control over when your component updates. Only when you provide a selector will the component re-render when the selected state values change.

Available state properties:

executionCount: Number of function executions that have been completed
lastArgs: The arguments from the most recent call to maybeExecute
lastExecutionTime: Timestamp of the last function execution in milliseconds
nextExecutionTime: Timestamp when the next execution can occur in milliseconds
isPending: Whether the throttler is waiting for the timeout to trigger execution
status: Current execution status ('disabled' | 'idle' | 'pending')

Type Parameters
--------------- ### TFn

TFn extends AnyFunction

### TSelected

TSelected = { }

Parameters
---------- ### fn

TFn

### options

ThrottlerOptions<TFn>

### selector

(state) => TSelected

Returns
-------

ReactThrottler <TFn, TSelected>

Example
-------

tsx

// Default behavior - no reactive state subscriptions
const [value, setValue] = useState(0);
const throttler = useThrottler(setValue, { wait: 1000 });

// Opt-in to re-render when execution count changes (optimized for tracking executions)
const [value, setValue] = useState(0);
const throttler = useThrottler(
  setValue,
  { wait: 1000 },
  (state) => ({ executionCount: state.executionCount })
);

// Opt-in to re-render when throttling state changes (optimized for loading indicators)
const [value, setValue] = useState(0);
const throttler = useThrottler(
  setValue,
  { wait: 1000 },
  (state) => ({
    isPending: state.isPending,
    status: state.status
  })
);

// Opt-in to re-render when timing information changes (optimized for timing displays)
const [value, setValue] = useState(0);
const throttler = useThrottler(
  setValue,
  { wait: 1000 },
  (state) => ({
    lastExecutionTime: state.lastExecutionTime,
    nextExecutionTime: state.nextExecutionTime
  })
);

// With any state manager
const throttler = useThrottler(
  (value) => stateManager.setState(value),
  {
    wait: 2000,
    leading: true,   // Execute immediately on first call
    trailing: false  // Skip trailing edge updates
  }
);

// Access the selected state (will be empty object {} unless selector provided)
const { executionCount, isPending } = throttler.state;


// Default behavior - no reactive state subscriptions
const [value, setValue] = useState(0);
const throttler = useThrottler(setValue, { wait: 1000 });

// Opt-in to re-render when execution count changes (optimized for tracking executions)
const [value, setValue] = useState(0);
const throttler = useThrottler(
  setValue,
  { wait: 1000 },
  (state) => ({ executionCount: state.executionCount })
);

// Opt-in to re-render when throttling state changes (optimized for loading indicators)
const [value, setValue] = useState(0);
const throttler = useThrottler(
  setValue,
  { wait: 1000 },
  (state) => ({
    isPending: state.isPending,
    status: state.status
  })
);

// Opt-in to re-render when timing information changes (optimized for timing displays)
const [value, setValue] = useState(0);
const throttler = useThrottler(
  setValue,
  { wait: 1000 },
  (state) => ({
    lastExecutionTime: state.lastExecutionTime,
    nextExecutionTime: state.nextExecutionTime
  })
);

// With any state manager
const throttler = useThrottler(
  (value) => stateManager.setState(value),
  {
    wait: 2000,
    leading: true,   // Execute immediately on first call
    trailing: false  // Skip trailing edge updates
  }
);

// Access the selected state (will be empty object {} unless selector provided)
const { executionCount, isPending } = throttler.state;

Edit on GitHub

ReactAsyncThrottler

useThrottledCallback

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