explicame este codigo

function arrayDiff(a, b) {
  return a.filter((value) => !b.includes(value));
}

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const toggleInfo = (index, event) => {
    setVisibleLightIndexes((prev) => {
      if (prev.includes(index)) {
        return prev.filter((i) => i !== index);
      } else {
        return [...prev, index];
      }
    });
const clickedElement = event.target.closest(".chauvetLights");
if (clickedElement) {
  clickedElement.classList.toggle("expanded");
}
 toggleBackgroundColor(event);
  };
TypeError: Cannot read properties of undefined (reading 'target')
    at k (home-OO3WpeNb.js:1:102576)
    at onClick (home-OO3WpeNb.js:1:104620)
    at Object.Em (index-h-qGlws7.js:38:9852)
    at km (index-h-qGlws7.js:38:10006)
    at Cm (index-h-qGlws7.js:38:10063)
    at Wa (index-h-qGlws7.js:38:31422)
    at fd (index-h-qGlws7.js:38:31839)
    at index-h-qGlws7.js:38:36751
    at Vs (index-h-qGlws7.js:41:36768)
    at Df (index-h-qGlws7.js:38:8988)

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