Move esmodule export to be after the declaration (codesandbox#3452)

Author: CompuIves

packages/app/src/sandbox/eval/transpilers/babel/convert-esmodule/__snapshots__/index.test.ts.snap

@@ -4,17 +4,17 @@ exports[`convert-esmodule can convert class default exports 1`] = `
 "Object.defineProperty(exports, \\"__esModule\\", {
   value: true
 });
-exports.default = A;
 class A {}
+exports.default = A;
 "
 `;
 
 exports[`convert-esmodule can convert default exports 1`] = `
 "Object.defineProperty(exports, \\"__esModule\\", {
   value: true
 });
-exports.default = test;
 function test() {}
+exports.default = test;
 "
 `;
 
@@ -140,8 +140,8 @@ exports[`convert-esmodule handles export mutations 1`] = `
 "Object.defineProperty(exports, \\"__esModule\\", {
   value: true
 });
-exports.default = test;
 function test() {}
+exports.default = test;
 exports.default = test = 5;;
 "
 `;
@@ -150,8 +150,8 @@ exports[`convert-esmodule handles export mutations with no named function 1`] =
 "Object.defineProperty(exports, \\"__esModule\\", {
   value: true
 });
-exports.default = $csb__default;
 function $csb__default() {}
+exports.default = $csb__default;
 "
 `;
 

packages/app/src/sandbox/eval/transpilers/babel/convert-esmodule/index.ts

@@ -170,17 +170,18 @@ export function convertEsModule(code: string) {
               name: varName,
             };
           }
+
+          program.body[
+            i
+          ] = statement.declaration as meriyah.ESTree.DeclarationStatement;
+          i++;
+
           program.body.splice(
             i,
             0,
             generateExportStatement(statement.declaration.id.name, 'default')
           );
           i++;
-
-          program.body[
-            i
-          ] = statement.declaration as meriyah.ESTree.DeclarationStatement;
-          i++;
         } else {
           program.body[i] = {
             type: n.VariableDeclaration,