gulp.task('fix:angular:bootstrap', () => {
 // fix https://github.com/angular-ui/bootstrap/issues/6532
 const path = './node_modules/angular-ui-bootstrap/src/buttons/';
 return gulp.src(`${path}buttons.js`)
 .pipe(require('gulp-replace')(
 'attrs.$set(\'uncheckable\', uncheckable ? \'\' : undefined);',
 'attrs.$set(\'disabled\', uncheckable ? \'disabled\' : undefined);'
 ))
 .pipe(gulp.dest(path));
});

 angular.module('ui.bootstrap.buttons')
 .decorator('uibBtnRadioDirective', [ '$delegate', '$parse',
 function uibBtnRadioDirectiveDecorator($delegate, $parse) {
 var directive = $delegate[0];
 // fixed link function
 var link = function (scope, element, attrs, ctrls) {
 var buttonsCtrl = ctrls[0], ngModelCtrl = ctrls[1];
 var uncheckableExpr = $parse(attrs.uibUncheckable);
 element.find('input').css({display: 'none'});
 //model -> UI
 ngModelCtrl.$render = function () {
 element.toggleClass(buttonsCtrl.activeClass, angular.equals(ngModelCtrl.$modelValue, scope.$eval(attrs.uibBtnRadio)));
 };
 //ui->model
 element.on(buttonsCtrl.toggleEvent, function () {
 if (attrs.disabled) {
 return;
 }
 var isActive = element.hasClass(buttonsCtrl.activeClass);
 if (!isActive || angular.isDefined(attrs.uncheckable)) {
 scope.$apply(function () {
 ngModelCtrl.$setViewValue(isActive ? null : scope.$eval(attrs.uibBtnRadio));
 ngModelCtrl.$render();
 });
 }
 });
 if (attrs.uibUncheckable) {
 scope.$watch(uncheckableExpr, function (uncheckable) {
 attrs.$set('disabled', uncheckable ? 'disabled' : undefined);
 });
 }
 };
 directive.compile = function() {
 return function(scope, element, attrs) {
 link.apply(this, arguments);
 };
 };
 return $delegate;
 }
 ]);