diff --git a/test/component.test.ts b/test/component.test.ts
index 0376d91..849f9da 100644
--- a/test/component.test.ts
+++ b/test/component.test.ts
@@ -505,3 +505,4 @@ Component<{}, {}, { fn(): void }, []>({
     }
   })
 }
+
diff --git a/test/issue.test.ts b/test/issue.test.ts
index 9390d0c..08e0d96 100644
--- a/test/issue.test.ts
+++ b/test/issue.test.ts
@@ -634,4 +634,25 @@ import WX = WechatMiniprogram
       },
     }
   })
+}
+
+// https://github.com/wechat-miniprogram/api-typings/pull/351
+{
+  type Properties = {
+    customProp: string
+    [key: string]: unknown;
+    [key: number]: string;
+  }
+  Component<Properties, {}, {}, []>({
+    lifetimes: {
+      created() {
+        this.properties[1] = '1';
+        expectError(() => {
+          this.properties[2] = 2;
+        });
+        expectError(this.properties.xxx);
+        this.properties.customProp = 'customProp';
+      }
+    }
+  })
 }
\ No newline at end of file
diff --git a/types/wx/lib.wx.component.d.ts b/types/wx/lib.wx.component.d.ts
index ca0c53b..e713942 100644
--- a/types/wx/lib.wx.component.d.ts
+++ b/types/wx/lib.wx.component.d.ts
@@ -21,7 +21,9 @@ SOFTWARE.
 ***************************************************************************** */
 
 declare namespace WechatMiniprogram.Component {
-    type FilterUnknownType<T> = string extends keyof T ? {} : T
+    type FilterUnknownType<T> = {
+        [P in keyof T as string extends P ? never : P]: T[P]
+    }
     type Instance<
         TData extends DataOption,
         TProperty extends PropertyOption,