chatGPTBox/src/utils/get-core-content-text.mjs

function getArea(e) {
  const rect = e.getBoundingClientRect()
  return rect.width * rect.height
}

function findLargestElement(e) {
  let maxArea = 0
  let largestElement = null
  const limitedArea = 0.8 * getArea(e)

  function traverseDOM(node) {
    if (node.nodeType === Node.ELEMENT_NODE) {
      const area = getArea(node)

      if (area > maxArea && area < limitedArea) {
        maxArea = area
        largestElement = node
      }

      Array.from(node.children).forEach(traverseDOM)
    }
  }

  traverseDOM(e)
  return largestElement
}

export function getCoreContentText() {
  const largestElement = findLargestElement(document.body)
  const secondLargestElement = findLargestElement(largestElement)
  console.log(largestElement)
  console.log(secondLargestElement)

  if (!largestElement) return

  let ret
  if (secondLargestElement && getArea(secondLargestElement) > 0.5 * getArea(largestElement)) {
    ret = secondLargestElement.innerText || secondLargestElement.textContent
    console.log('use second')
  } else {
    ret = largestElement.innerText || largestElement.textContent
    console.log('use first')
  }
  return ret.trim().replaceAll('  ', '').replaceAll('\n\n', '').replaceAll(',,', '')
}