feat(compiler-sfc): allow return render in <script setup>

Author: sxzz

packages/compiler-sfc/src/script/context.ts

@@ -101,11 +101,12 @@ export class ScriptCompileContext {
       options.babelParserPlugins
     )
 
-    function parse(input: string, offset: number): Program {
+    function parse(input: string, offset: number, setup?: boolean): Program {
       try {
         return babelParse(input, {
           plugins,
-          sourceType: 'module'
+          sourceType: 'module',
+          allowReturnOutsideFunction: setup
         }).program
       } catch (e: any) {
         e.message = `[vue/compiler-sfc] ${e.message}\n\n${
@@ -125,7 +126,7 @@ export class ScriptCompileContext {
 
     this.scriptSetupAst =
       descriptor.scriptSetup &&
-      parse(descriptor.scriptSetup!.content, this.startOffset!)
+      parse(descriptor.scriptSetup!.content, this.startOffset!, true)
   }
 
   getString(node: Node, scriptSetup = true): string {