Show and Hide loading using seperate promise file and using try and catch

promise.js

function myPromise() {
    return new Promise((resolve, reject) => {
        setTimeout(() => {
            resolve('Stack Overflow');
            // reject('Some Error')
        }, 2000);
    });
}

function showSpinner() {
  document.getElementById('loader').style.display = 'block';
}

function hideSpinner() {
  document.getElementById('loader').style.display = 'none';
}

async function sayHello() {
     try {
       showSpinner()
       const externalFetchedText = await myPromise();
       console.log('Hello ' + externalFetchedText);
     } catch (err) {
       console.error(err);
     } finally {
       hideSpinner()
     }
}

sayHello();