fix: fix exporting function expression

Fixes #3831

Author: nolimits4web

lib/transform-script.js

@@ -39,7 +39,8 @@ module.exports = ({ script, template, id, style }) => {
       if (
         node.declaration &&
         (node.declaration.type === 'ArrowFunctionExpression' ||
-          node.declaration.type === 'FunctionDeclaration')
+          node.declaration.type === 'FunctionDeclaration' ||
+          node.declaration.type === 'FunctionExpression')
       ) {
         astExtend = transformToAst(
           astExtendFunction.replace(