e-typingのお題をクリップボードにコピーするコード

e-typing.js

const cp = copy
const observe = (target, callback) => {
  const observer = new MutationObserver(records => {
    records.forEach(record => {
      if (!record.addedNodes[0]) return
      callback(record, () => observer.disconnect())
    })
  })
  observer.observe(target, { childList: true })
}
observe(document.getElementById('example_container'), (record, disconnect) => {
  if (record.addedNodes[0].id !== 'kanaText') return
  disconnect()
  const el = record.addedNodes[0].children[0]
  cp(el.children[1].textContent)
  observe(el, record => {
    if (record.addedNodes[0].classList.length) return
    cp(record.addedNodes[0].textContent)
  })
})

min.js

const cp=copy,observe=(e,d)=>{const t=new MutationObserver(e=>{e.forEach(e=>{e.addedNodes[0]&&d(e,()=>t.disconnect())})});t.observe(e,{childList:!0})};observe(document.getElementById("example_container"),(e,d)=>{if("kanaText"!==e.addedNodes[0].id)return;d();const t=e.addedNodes[0].children[0];cp(t.children[1].textContent),observe(t,e=>{e.addedNodes[0].classList.length||cp(e.addedNodes[0].textContent)})});