fix(compiler-sfc): fix 'export default' rewrite with extra whitespaces (#4375)

packages/compiler-sfc/__tests__/__snapshots__/compileScript.spec.ts.snap

@@ -33,6 +33,48 @@ return { x }
       export const n = 1"
 `;
 
+exports[`SFC compile <script setup> <script> and <script setup> co-usage spaces in ExportDefaultDeclaration node with many spaces and newline 1`] = `
+"import { x } from './x'
+        
+        export const n = 1
+        const __default__ = {   
+          some:'option'
+        }
+        
+function setup(__props, { expose }) {
+
+        x()
+        
+return { x }
+}
+
+
+export default /*#__PURE__*/ Object.assign(__default__, {
+  setup
+})"
+`;
+
+exports[`SFC compile <script setup> <script> and <script setup> co-usage spaces in ExportDefaultDeclaration node with minimal spaces 1`] = `
+"import { x } from './x'
+        
+        export const n = 1
+        const __default__ = {   
+          some:'option'
+        }
+        
+function setup(__props, { expose }) {
+
+        x()
+        
+return { x }
+}
+
+
+export default /*#__PURE__*/ Object.assign(__default__, {
+  setup
+})"
+`;
+
 exports[`SFC compile <script setup> defineEmits() 1`] = `
 "export default {
   emits: ['foo', 'bar'],