Function Utility Types
Function Utilities
π¨βπΌ You've mastered function utilities!
π¦ These are incredibly useful for:
- Wrapper functions - Preserve parameter and return types
- Type extraction - Get types from third-party libraries
- Generic utilities - Write functions that work with any function
// Generic logging wrapper
function withLogging<T extends (...args: Array<any>) => any>(
fn: T,
): (...args: Parameters<T>) => ReturnType<T> {
return (...args) => {
console.log('Calling with:', args)
return fn(...args)
}
}
This pattern is used extensively in middleware, decorators, and testing utilities.
