chore: prettier source code

src/calendar/utils.ts

@@ -59,7 +59,7 @@ export function calcDateNum(date: [Date, Date]) {
 
 export function copyDates(dates: Date | Date[]) {
   if (Array.isArray(dates)) {
-    return dates.map(date => {
+    return dates.map((date) => {
       if (date === null) {
         return date;
       }