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

function useDebouncer<TFn, TSelected>(
   fn, 
   options, 
selector): ReactDebouncer<TFn, TSelected>;


function useDebouncer<TFn, TSelected>(
   fn, 
   options, 
selector): ReactDebouncer<TFn, TSelected>;

Defined in: react-pacer/src/debouncer/useDebouncer.ts:103

A React hook that creates and manages a Debouncer instance.

This is a lower-level hook that provides direct access to the Debouncer's functionality without any built-in state management. This allows you to integrate it with any state management solution you prefer (useState, Redux, Zustand, etc.).

This hook provides debouncing functionality to limit how often a function can be called, waiting for a specified delay before executing the latest call. This is useful for handling frequent events like window resizing, scroll events, or real-time search inputs.

The debouncer will only execute the function after the specified wait time has elapsed since the last call. If the function is called again before the wait time expires, the timer resets and starts waiting again.

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:

canLeadingExecute: Whether the debouncer can execute on the leading edge
executionCount: Number of function executions that have been completed
isPending: Whether the debouncer is waiting for the timeout to trigger execution
lastArgs: The arguments from the most recent call to maybeExecute
status: Current execution status ('disabled' | 'idle' | 'pending')

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

TFn extends AnyFunction

### TSelected

TSelected = { }

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

TFn

### options

DebouncerOptions<TFn>

### selector

(state) => TSelected

Returns
-------

ReactDebouncer <TFn, TSelected>

Example
-------

tsx

// Default behavior - no reactive state subscriptions
const searchDebouncer = useDebouncer(
  (query: string) => fetchSearchResults(query),
  { wait: 500 }
);

// Opt-in to re-render when isPending changes (optimized for loading states)
const searchDebouncer = useDebouncer(
  (query: string) => fetchSearchResults(query),
  { wait: 500 },
  (state) => ({ isPending: state.isPending })
);

// Opt-in to re-render when executionCount changes (optimized for tracking execution)
const searchDebouncer = useDebouncer(
  (query: string) => fetchSearchResults(query),
  { wait: 500 },
  (state) => ({ executionCount: state.executionCount })
);

// Multiple state properties - re-render when any of these change
const searchDebouncer = useDebouncer(
  (query: string) => fetchSearchResults(query),
  { wait: 500 },
  (state) => ({
    isPending: state.isPending,
    executionCount: state.executionCount,
    status: state.status
  })
);

// In an event handler
const handleChange = (e) => {
  searchDebouncer.maybeExecute(e.target.value);
};

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


// Default behavior - no reactive state subscriptions
const searchDebouncer = useDebouncer(
  (query: string) => fetchSearchResults(query),
  { wait: 500 }
);

// Opt-in to re-render when isPending changes (optimized for loading states)
const searchDebouncer = useDebouncer(
  (query: string) => fetchSearchResults(query),
  { wait: 500 },
  (state) => ({ isPending: state.isPending })
);

// Opt-in to re-render when executionCount changes (optimized for tracking execution)
const searchDebouncer = useDebouncer(
  (query: string) => fetchSearchResults(query),
  { wait: 500 },
  (state) => ({ executionCount: state.executionCount })
);

// Multiple state properties - re-render when any of these change
const searchDebouncer = useDebouncer(
  (query: string) => fetchSearchResults(query),
  { wait: 500 },
  (state) => ({
    isPending: state.isPending,
    executionCount: state.executionCount,
    status: state.status
  })
);

// In an event handler
const handleChange = (e) => {
  searchDebouncer.maybeExecute(e.target.value);
};

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

Edit on GitHub

ReactAsyncDebouncer

useDebouncedCallback

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