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A `useEffectDebugger` hook to debug which dependency changed causing `useEffect` hook to fire
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// a code snippet living in a component | |
// source: https://stackoverflow.com/a/59843241/3600510 | |
const usePrevious = (value, initialValue) => { | |
const ref = useRef(initialValue); | |
useEffect(() => { | |
ref.current = value; | |
}); | |
return ref.current; | |
}; | |
const useEffectDebugger = (effectHook, dependencies, dependencyNames = []) => { | |
const previousDeps = usePrevious(dependencies, []); | |
const changedDeps = dependencies.reduce((accum, dependency, index) => { | |
if (dependency !== previousDeps[index]) { | |
const keyName = dependencyNames[index] || index; | |
return { | |
...accum, | |
[keyName]: { | |
before: previousDeps[index], | |
after: dependency, | |
}, | |
}; | |
} | |
return accum; | |
}, {}); | |
if (Object.keys(changedDeps).length) { | |
console.log('[use-effect-debugger] ', changedDeps); | |
} | |
useEffect(effectHook, dependencies); | |
}; |
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