useEffectDebugger for comparing dependency list

useEffectDebugger.js

// source: https://stackoverflow.com/a/59843241
const usePrevious = (value, initialValue) => {
  const ref = React.useRef(initialValue);
  React.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);
  }

  React.useEffect(effectHook, dependencies);
};



/**
Example Usage

Before:

useEffect(() => {
  // useEffect code here... 
}, [dep1, dep2])


After:

useEffectDebugger(() => {
  // useEffect code here... 
}, [dep1, dep2], ['dep1', 'dep2'])


Console output:

{
  dep2: {
    before: 'foo',
    after: 'bar'
  }
}
**/