{
  "fontawesome4": "https://maxcdn.bootstrapcdn.com/font-awesome/4.7.0/css/font-awesome.min.css",
  "fontawesome5": "https://use.fontawesome.com/releases/v5.3.1/js/all.js",
  "ionicons": "https://code.ionicframework.com/ionicons/2.0.1/css/ionicons.min.css",
  "mdi": "https://cdn.materialdesignicons.com/2.1.19/css/materialdesignicons.min.css"
}