fix: build with nuxt 2

Author: fabiiomiiguel

src/helpers.js

@@ -9,7 +9,7 @@
  * @returns {T} The bare export
  */
 // eslint-disable-next-line no-underscore-dangle
-const importDefault = mod => (mod?.__esModule ? mod.default : mod);
+const importDefault = mod => (mod && mod.__esModule ? mod.default : mod);
 
 module.exports = {
   importDefault

src/variants.js

@@ -32,7 +32,7 @@ const variants = [
  * @returns {string} The variant format string
  */
 const getDefaultFormat = (variant, config) => {
-  if (variant === 'hover' && flagEnabled?.(config(), 'hoverOnlyWhenSupported')) {
+  if (variant === 'hover' && flagEnabled && flagEnabled(config(), 'hoverOnlyWhenSupported')) {
     return '@media (hover: hover) and (pointer: fine) { &:hover }';
   }
 
@@ -48,7 +48,7 @@ const getDefaultFormat = (variant, config) => {
  * @returns {string} The variant format string
  */
 const getScrollbarFormat = (variant, config) => {
-  if (variant === 'hover' && flagEnabled?.(config(), 'hoverOnlyWhenSupported')) {
+  if (variant === 'hover' && flagEnabled && flagEnabled(config(), 'hoverOnlyWhenSupported')) {
     return '@media (hover: hover) and (pointer: fine) { & }';
   }