const textInput = document.getElementById('text-input');
 
 export function execute() {
   document.addEventListener('compositionupdate', e => {
     const buttons = document.getElementsByClassName('popup-menu')
       ?.[0]?.getElementsByClassName('button')
     if (!buttons) return; // そもそもpopup menuがなかったら何もしない
     if (e.data.length === 0) return;
     switch(e.data.split('').pop()) {
       case '「':
         e.preventDefault();
         e.stopPropagation();
         
         document.getElementsByClassName('button link-button')?.[0]?.click();
         
         textInput.blur();// IMEの文字列を強制的に確定させる
         deleteBackward(e.data.length);// 確定して流し込まれた文字列を削除する
         textInput.focus();// カーソルのfocusを戻す
         break;
       default:
         break;
     }
   });
 }
 
 function deleteBackward(count) {
   const deleteParam = {keyCode: 8, key: 'Backspace', bubbles: true, cancelable: true};
   for (let i = 0; i < count; i++) {
     textInput.dispatchEvent(new KeyboardEvent('keydown', deleteParam));
     textInput.dispatchEvent(new KeyboardEvent('keyup', deleteParam));
   }
 }
 execute()