index.js

function getGlobal() { 
  if (typeof globalThis !== 'undefined') { return globalThis; } 
  if (typeof self !== 'undefined') { return self; } 
  if (typeof window !== 'undefined') { return window; } 
  if (typeof global !== 'undefined') { return global; } 
  throw new Error('unable to locate global object'); 
} 

module.exports = function awaitGlobal(key, wait, maxAttempts) {
  const root = getGlobal();
  let attempts = maxAttempts || 3;
  return new Promise((resolve, reject) => {
    let timer;
    const loop = () => {
      attempts--;
      if(root[key]) {
        resolve(root[key]);
        clearInterval(timer);
      } else if (!attempts) {
        reject(new Error('Too many attempts'));
        clearInterval(timer);
      }
    };
    timer = setInterval(loop, wait || 300);
    loop();
  });
};