angular.module('myApp', [
  // ...
  'mm.emoji.utils'
]);

module.controller('MyCtrl', ['emojiMap', function(emojiMap) {
  var heart = emojiMap[':heart:']; // heart is now \u2764
}]);

module.controller('MyCtrl', ['emojiToUnicodeFilter', function(emojiToUnicodeFilter) {
  $scope.submit = function() {
    // subsititude emoji "short codes" with it's unicode string.
    $scope.text = emojiToUnicodeFilter($scope.text);
    // use twemoji to convert the message to html.
    var html = $window.twemoji.parse($scope.text);
}]);