types(Dialog): improve showDialog return type (#12316)

packages/vant/src/dialog/function-call.tsx

@@ -46,10 +46,12 @@ function initInstance() {
   ({ instance } = mountComponent(Wrapper));
 }
 
-export function showDialog(options: DialogOptions) {
+export function showDialog(
+  options: DialogOptions,
+): Promise<DialogAction | undefined> {
   /* istanbul ignore if */
   if (!inBrowser) {
-    return Promise.resolve();
+    return Promise.resolve(undefined);
   }
 
   return new Promise((resolve, reject) => {
@@ -59,7 +61,7 @@ export function showDialog(options: DialogOptions) {
 
     instance.open(
       extend({}, currentOptions, options, {
-        callback: (action: DialogAction) => {
+        callback: (action?: DialogAction) => {
           (action === 'confirm' ? resolve : reject)(action);
         },
       }),

packages/vant/src/swipe-cell/README.md

@@ -92,8 +92,8 @@ export default {
             showConfirmDialog({
               title: 'Are you sure to delete?',
             })
-              .then(resolve)
-              .catch(resolve);
+              .then(() => resolve(true))
+              .catch(() => resolve(false));
           });
       }
     };

packages/vant/src/swipe-cell/README.zh-CN.md

@@ -99,8 +99,8 @@ export default {
             showConfirmDialog({
               title: '确定删除吗？',
             })
-              .then(resolve)
-              .catch(resolve);
+              .then(() => resolve(true))
+              .catch(() => resolve(false));
           });
       }
     };

packages/vant/src/swipe-cell/demo/index.vue

@@ -38,9 +38,13 @@ const beforeClose = ({ position }: { position: string }) => {
     case 'outside':
       return true;
     case 'right':
-      return showConfirmDialog({
-        title: t('confirm'),
-      }) as Promise<boolean>;
+      return new Promise<boolean>((resolve) => {
+        showConfirmDialog({
+          title: t('confirm'),
+        })
+          .then(() => resolve(true))
+          .catch(() => resolve(false));
+      });
   }
 };
 </script>