Typescript converted file

app.ts

const quoteContainer = document.getElementById('quote-container');
const loader = document.getElementById('loader');
const quoteText = document.getElementById('quote');
const authorText = document.getElementById('author');
const twitterBtn = document.getElementById('twitter');
const newQuoteBtn = document.getElementById('new-quote');

interface QuoteData {
  quoteAuthor: string;
  quoteText: string;
  quoteLink?: string;
  senderLink?: string;
  senderName?: string;
}

const showContentLoader = () => {
  if (loader && quoteContainer) {
    loader.hidden = false;
    quoteContainer.hidden = true;
  }
}

const hideContentLoader = () => {
  if (loader && quoteContainer) {
    if (!loader.hidden) {
      quoteContainer.hidden = false;
      loader.hidden = true;
    }
  }
}

// Get quote from API
const getQuote = async () => {
  showContentLoader();
  const proxyUrl = 'https://cors-anywhere.herokuapp.com/'
  const apiUrl = `https://api.forismatic.com/api/1.0/?method=getQuote&lang=en&format=json`;

  try {
    const response = await fetch(proxyUrl + apiUrl);
    const data: QuoteData = await response.json();

    if (authorText && quoteText) {
      // default to annoynmous if there is no author
      data.quoteAuthor === ''
        ? authorText.innerText = 'Anoynmous'
        : authorText.innerText = data.quoteAuthor;

      // Dynamically change text size
      data.quoteText.length > 120
        ? quoteText.classList.add('long-quote')
        : quoteText.classList.remove('long-quote');

      quoteText.innerText = data.quoteText;

      // show quote
      hideContentLoader();
    }
  } catch (error) {
    getQuote();
  }
}

// Tweet quote
const tweetQuote = () => {
  if (quoteText && authorText) {
    const quote = quoteText.innerText;
    const author = authorText.innerText;
    const twitterUrl = `https://twitter.com/intent/tweet?text=${quote} - ${author}`;

    window.open(twitterUrl, '_blank');
  }
}

// Hook up the new tweet event
if (newQuoteBtn && twitterBtn) {
  newQuoteBtn.addEventListener('click', getQuote);
  twitterBtn.addEventListener('click', tweetQuote);
}

// OnLoad
getQuote();