index.html

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <meta http-equiv="X-UA-Compatible" content="ie=edge">
  <link rel="stylesheet" href="https://unpkg.com/leaflet@1.3.1/dist/leaflet.css"
  integrity="sha512-Rksm5RenBEKSKFjgI3a41vrjkw4EVPlJ3+OiI65vTjIdo9brlAacEuKOiQ5OFh7cOI1bkDwLqdLw3Zg0cRJAAQ=="
  crossorigin=""/>
  <script src="https://unpkg.com/leaflet@1.3.1/dist/leaflet.js"
  integrity="sha512-/Nsx9X4HebavoBvEBuyp3I7od5tA0UzAxs+j83KgC8PU0kgB4XiK4Lfe4y4cgBtaRJQEIFCW+oC506aPT2L1zw=="
  crossorigin=""></script>
  <title>Document</title>
</head>
<body>
  <div id="app"></div>

  <script type="text/javascript" src="https://maps.googleapis.com/maps/api/js?key=AIzaSyCoq4_-BeKtYRIs-3FjJL721G1eP5DaU0g&libraries=places"></script>
</body>
</html>