const bool = true;

const returnBoolIfTrue = () =>
  new Promise(
    (resolve, reject) =>
      bool ? resolve(bool) : reject(new Error("dat shit ain't true"))
  );

const logArg = arg => console.log(arg);

//which do you prefer?

//case 1
returnBoolIfTrue().then(logArg);

//case 2
returnBoolIfTrue().then(result => logArg(result));