react-effect-decision

Avoid unnecessary useEffect by deriving values in render, using event handlers for user actions, and leveraging key-based remounts instead of sprinkling raw effects. This reduces unintentional side effects and simplifies component logic.

The best way to handle derived state without useEffect is to calculate it during the render phase. Render-time derivation eliminates the extra render cycles caused by state updates inside effects, keeping your component architecture cleaner and more predictable.

Use a dedicated useMountEffect wrapper for one-time setups like initial subscriptions instead of direct useEffect. This enforces a clear policy by isolating mount-time logic, preventing raw effects from being sprinkled throughout your feature code during component refactoring.

Yes, this useEffect decision framework works for refactoring existing React components. It provides actionable rules to identify and replace state, effect, subscription, and event handling patterns with safer alternatives like render-time derivations and memoization.

Fetch external data by moving logic out of raw useEffect into event handlers or dedicated fetching patterns. The framework guides you to handle client fetching and subscriptions safely, minimizing side effects and keeping feature code clean during component design.

Deriving state in render reduces side effects because it calculates values synchronously without triggering additional render cycles. Unlike useEffect, which updates state post-render and causes re-renders, render-time derivation keeps component behavior predictable and effect-free.