app.js

import Alpine from "alpinejs";
Alpine.start();
const app = new Vue({
 el: "#app",
 data: {
    amount: null,
    from: null,
    to: null,
 },
 methods: {
    submit() {
      const fromCurrency = this.from;
      const toCurrency = this.to;
      if(fromCurrency && toCurrency){
        return(html`<h1>The amount of ${amount} in ${fromCurrency} is ${conversion(amount, fromCurrency, toCurrency)} in ${toCurrency}!</h1>`);
      } else {
        return(html`<h1>Please select a currency!</h1>`);
      }
    },
    conversion(amount, fromCurrency, toCurrency){
      // Conversion logic
    }
 },
});