wait-for-kintone.js

function waitForKintone(success, error, timeout) {
  const startAt = new Date().getTime();

  function recursive() {
    if (window.hasOwnProperty('kintone')) {
      console.log("has kintone");
      func();
    } else if (new Date().getTime() - startAt > timeout) {
      console.log("not has kintone");
      error();
    } else {
      console.log("continue...");
      setTimeout(recursive, 1000);
    }
  }

  recursive();
}