diff --git a/main.uts b/main.uts
index f8fa502212cd567f9ee877a33b293b86e2c776d7..f321b3c4f1191409326709752fc3c05d4a943163 100644
--- a/main.uts
+++ b/main.uts
@@ -19,8 +19,8 @@ export function createApp() {
     str: 'default reactive string',
     num: 0,
     bool: false,
-  })
-  app.config.globalProperties.globalPropertiesFn = () : string => {
+  } as UTSJSONObject)
+  app.config.globalProperties.globalPropertiesFn = function () : string {
     console.log('this.globalPropertiesStr', this.globalPropertiesStr)
     console.log('this.globalPropertiesNum', this.globalPropertiesNum)
     return `globalPropertiesStr: ${this.globalPropertiesStr}, globalPropertiesNum: ${this.globalPropertiesNum}`
@@ -29,4 +29,4 @@ export function createApp() {
   return {
     app
   }
-}
+}