Override previous directives or filters in angular

unregister.js

/**
 * unregister
 *
 * unregister old directives or filters
 *
 * @param {Object.<{name: string, type: string}>[]} declares
 * @param string module
 * @returns {undefined}
 * @example
 * {name: 'foo', type: 'directive')
 * type can only be `directive` or `filter`
 * Services and factories will be override by angular itself
 */
function unregister(declares, module) {
  if (!angular.isArray(declares)) {
    declares = [declares];
  }
  declares.forEach(function(declare) {
    if (angular.isString(declare)) {
      declare = { name: declare };
    }

    var type = '';
    switch(declare.type) {
      case 'directive':
        type = 'Directive';
        break;
      case 'filter':
        type = 'Filter';
        break;
      default:
        type = 'Directive';
        break;
    }

    angular.module(module).config(['$provide', function($provide) {
      $provide.decorator(declare.name + type, ['$delegate', function($delegate) {
        if ($delegate.length > 1) {
          $delegate.shift();
        }
        return $delegate;
      }]);
    }]);

  });
}


// sample usage:
// by default it's directive
unregister('foo', 'Foo');
// or
unregister({name: 'foo'}, 'Foo');
// or
unregister([{name: 'foo'}, {name: 'bar', type: 'filter'}], 'Foo');