Function isComment

packages/server-renderer/src/helpers/ssrRenderSlot.ts:133–138

(item: SSRBufferItem)

const commentTestRE = /^<!--[\s\S]*-->$/
const commentRE = /<!--[^]*?-->/gm
function isComment(item: SSRBufferItem) {
  if (typeof item !== 'string' || !commentTestRE.test(item)) return false
  // if item is '<!---->' or '<!--[-->' or '<!--]-->', return true directly
  if (item.length <= 8) return true
  return !item.replace(commentRE, '').trim()
}