Edit in JSFiddle

angular.module("app", [])
  .controller("controller", ["$scope", function($scope) {
  	var self = this;
    self.text = "long words - long words - long words - long words - long words - long words - long words - long words - long words - long words - long words - long words - long words - long words - long words"
  }])
  .directive('textareaAutoResizer', ["$sce", function($sce) {
    return {
      link: function(scope, element, attrs, ngModel) {
        autoResizeTextArea();

        scope.$watch(attrs.ngModel, function(newValue, oldValue) {
        	autoResizeTextArea();
        });
        
        element.on("input", autoResizeTextArea);

        function autoResizeTextArea(event) {
          var dom = angular.element(element);

          dom.css({
            height: ""
          });
          if (dom.prop("scrollHeight") > dom.innerHeight()) {
            //set dom height(without padding part) to scrollHeight - padding part
            dom.height(dom.prop("scrollHeight") - (dom.innerHeight() - dom.height()));
          }
        }
      }
    };
  }]);

<script src="https://code.jquery.com/jquery-3.5.1.min.js"></script>
<script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.8.2/angular.min.js"></script>

This &lt;textarea&gt; will change its height to contain content.
<div ng-app="app" ng-controller="controller as ctrl">
  <textarea textarea-auto-resizer ng-model="ctrl.text"></textarea>
</div>