refactor: 补充声明

typescript/base/single/img/img.ts

@@ -3,6 +3,10 @@ import { Single } from "../single";
 export declare class Img extends Single {
     static xtype: string;
 
+    props: {
+        src: string;
+    } & Single['props'];
+
     setSrc(src: string): void;
     getSrc(): string;
 }