workflow(sfc-playground): share and download buttons

packages/global.d.ts

@@ -27,5 +27,10 @@ declare module '*.vue' {
 
 }
 declare module '*?raw' {
-
+  const content: string
+  export default content
+}
+
+declare module 'file-saver' {
+  export function saveAs(blob: any, name: any): void
 }