useAsyncEffect
About
A version of useEffect
that accepts an async function and provides safe handling of asynchronous operations in React components. This hook solves the common problem of race conditions and memory leaks that occur when using async functions directly inside useEffect
.
The standard useEffect
hook only works with synchronous effect functions. While you can run async functions inside useEffect
, this approach has several gotchas involving React state manipulation, race conditions, and cleanup. useAsyncEffect
provides a safer alternative with built-in race condition prevention and proper cleanup handling.
Examples
Basic async data fetching
Preventing race conditions with multiple async calls
Using cleanup function for resource management
Advanced example with error handling and conditional execution
Arguments
Argument | Type | Description | Default |
---|---|---|---|
effect | Function | Async function that receives shouldContinueEffect callback | Required |
deps | DependencyList | Array of dependencies that trigger effect re-execution | Required |
cleanup | Function | Optional cleanup function called with the previous effect result | undefined |
Effect Function
The effect function receives a shouldContinueEffect
callback that should be used to check if the effect is still valid before updating state or performing side effects. This prevents race conditions and memory leaks.
Effect Function Parameters
Parameter | Type | Description |
---|---|---|
shouldContinueEffect | Function | Returns true if the effect is still valid and should continue |
Effect Function Return Value
The effect function can optionally return a value that will be passed to the cleanup function when the effect is cleaned up or re-run.
Cleanup Function
The cleanup function is called when:
- The component unmounts
- The dependencies change and the effect needs to re-run
- The component re-renders and the effect is cancelled
Cleanup Function Parameters
Parameter | Type | Description |
---|---|---|
result | Any | The value returned by the previous effect function |
Key Features
- Race Condition Prevention: The
shouldContinueEffect
callback prevents state updates from cancelled effects - Memory Leak Prevention: Automatic cleanup when components unmount or dependencies change
- Flexible Cleanup: Cleanup function receives the result from the previous effect execution
- Error Handling: Errors in async effects are properly propagated
- Dependency Tracking: Works just like
useEffect
with dependency arrays
Common Use Cases
- Data Fetching: Safe async data loading with race condition prevention
- WebSocket Connections: Managing persistent connections with proper cleanup
- Periodic Updates: Setting up intervals or timeouts with automatic cleanup
- Complex Async Workflows: Multi-step async operations with conditional execution
- Resource Management: Managing any async resources that need cleanup