test.js

const func = () => {
  if (condition) {
    return asyncCall().then(() => {
      if (condition) {
        if (condition) {
          // continue looping
          return func();
        } else {
          console.log('some logic');
        }
      } else {
        if (condition) {
          return func();
        } else {
          // run a different function that also returns a Promise
          return diffFunc();
        }
      }
    });
  } else {
    // make sure to return a Promise. Is this necessary if all of func() is wrapped in a .then()? 
    return Promise.resolve()
  }
}