fix(next-swc/ssg): less aggressive exports drop

packages/next-swc/crates/core/src/next_ssg.rs

@@ -13,6 +13,8 @@ use swc_ecmascript::{
     visit::{noop_fold_type, Fold},
 };
 
+static SSG_EXPORTS: &[&str; 3] = &["getStaticProps", "getStaticPaths", "getServerSideProps"];
+
 /// Note: This paths requires running `resolver` **before** running this.
 pub fn next_ssg(eliminated_packages: Rc<RefCell<FxHashSet<String>>>) -> impl Fold {
     Repeat::new(NextSsg {
@@ -55,9 +57,7 @@ struct State {
 impl State {
     #[allow(clippy::wrong_self_convention)]
     fn is_data_identifier(&mut self, i: &Ident) -> Result<bool, Error> {
-        let ssg_exports = &["getStaticProps", "getStaticPaths", "getServerSideProps"];
-
-        if ssg_exports.contains(&&*i.sym) {
+        if SSG_EXPORTS.contains(&&*i.sym) {
             if &*i.sym == "getServerSideProps" {
                 if self.is_prerenderer {
                     HANDLER.with(|handler| {
@@ -132,12 +132,30 @@ impl Fold for Analyzer<'_> {
 
     fn fold_export_named_specifier(&mut self, s: ExportNamedSpecifier) -> ExportNamedSpecifier {
         if let ModuleExportName::Ident(id) = &s.orig {
-            self.add_ref(id.to_id());
+            if !SSG_EXPORTS.contains(&&*id.sym) {
+                self.add_ref(id.to_id());
+            }
         }
 
         s
     }
 
+    fn fold_export_decl(&mut self, s: ExportDecl) -> ExportDecl {
+        if let Decl::Var(d) = &s.decl {
+            if d.decls.is_empty() {
+                return s;
+            }
+
+            if let Pat::Ident(id) = &d.decls[0].name {
+                if !SSG_EXPORTS.contains(&&*id.id.sym) {
+                    self.add_ref(id.to_id());
+                }
+            }
+        }
+
+        s.fold_children_with(self)
+    }
+
     fn fold_expr(&mut self, e: Expr) -> Expr {
         let e = e.fold_children_with(self);
 

packages/next-swc/crates/core/tests/fixture/ssg/getStaticProps/issue-31855/input.js

@@ -0,0 +1,16 @@
+export const revalidateInSeconds = 5 * 60;
+
+export const getStaticProps = async () => {
+  return {
+    props: {},
+    revalidate: revalidateInSeconds,
+  };
+};
+
+export default function Home({}) {
+  return (
+      <div>
+          <p>Hello World</p>
+      </div>
+  )
+}

packages/next-swc/crates/core/tests/fixture/ssg/getStaticProps/issue-31855/output.js

@@ -0,0 +1,5 @@
+export var __N_SSG = true;
+export const revalidateInSeconds = 5 * 60;
+export default function Home({}) {
+    return __jsx("div", null, __jsx("p", null, "Hello World"));
+};