JavaScript pending promises debug

promise_debug.js

// Adapted from https://makandracards.com/makandra/46681-javascript-how-to-query-the-state-of-a-promise
function promiseState(promise, callback) {
  const uniqueValue = /unique/;
  Promise.race([promise, Promise.resolve(uniqueValue)])
    .then(
      (value) => callback(value === uniqueValue ? 'pending' : 'fulfilled'),
      (reason) => callback(`rejected (${reason})`));
}
function debugPromiseState(promise) {
  promiseState(promise, (state) => {
    console.log(state);
    if (state === 'pending') {
      setTimeout(() => debugPromiseState(promise), 1000);
    }
  });
}