From 5c8aa522da205fc7fab156cb9d44c8acca872523 Mon Sep 17 00:00:00 2001
From: magic-akari <akari.ccino@gmail.com>
Date: Thu, 8 Aug 2024 14:25:06 +0800
Subject: [PATCH] fix(es/typescript): Strip declaration of exported function
 overloads (#9397)

- Closes https://github.com/swc-project/swc/issues/9396
---
 .changeset/eleven-dryers-brake.md                     |  6 ++++++
 crates/swc_fast_ts_strip/src/lib.rs                   | 11 +++--------
 crates/swc_fast_ts_strip/tests/fixture/issue-9396.js  |  1 +
 .../tests/fixture/issue-9396.transform.js             |  1 +
 crates/swc_fast_ts_strip/tests/fixture/issue-9396.ts  |  1 +
 5 files changed, 12 insertions(+), 8 deletions(-)
 create mode 100644 .changeset/eleven-dryers-brake.md
 create mode 100644 crates/swc_fast_ts_strip/tests/fixture/issue-9396.js
 create mode 100644 crates/swc_fast_ts_strip/tests/fixture/issue-9396.transform.js
 create mode 100644 crates/swc_fast_ts_strip/tests/fixture/issue-9396.ts

diff --git a/.changeset/eleven-dryers-brake.md b/.changeset/eleven-dryers-brake.md
new file mode 100644
index 000000000000..161f6aeaf4b7
--- /dev/null
+++ b/.changeset/eleven-dryers-brake.md
@@ -0,0 +1,6 @@
+---
+swc_fast_ts_strip: patch
+swc_core: patch
+---
+
+fix(es/typescript): Strip declaration of exported function overloads
diff --git a/crates/swc_fast_ts_strip/src/lib.rs b/crates/swc_fast_ts_strip/src/lib.rs
index 68cd118c05e5..d5bb8885cea0 100644
--- a/crates/swc_fast_ts_strip/src/lib.rs
+++ b/crates/swc_fast_ts_strip/src/lib.rs
@@ -655,14 +655,6 @@ impl Visit for TsStrip {
         n.visit_children_with(self);
     }
 
-    fn visit_fn_decl(&mut self, n: &FnDecl) {
-        if n.function.body.is_none() {
-            self.add_replacement(n.function.span);
-            return;
-        }
-        n.visit_children_with(self);
-    }
-
     fn visit_import_decl(&mut self, n: &ImportDecl) {
         if n.type_only {
             self.add_replacement(n.span);
@@ -955,6 +947,9 @@ impl IsTsDecl for Decl {
             Self::Var(ref var) => var.declare,
             Self::Fn(FnDecl { declare: true, .. })
             | Self::Class(ClassDecl { declare: true, .. }) => true,
+
+            Self::Fn(FnDecl { function, .. }) => function.body.is_none(),
+
             _ => false,
         }
     }
diff --git a/crates/swc_fast_ts_strip/tests/fixture/issue-9396.js b/crates/swc_fast_ts_strip/tests/fixture/issue-9396.js
new file mode 100644
index 000000000000..4eea3e2ad7d8
--- /dev/null
+++ b/crates/swc_fast_ts_strip/tests/fixture/issue-9396.js
@@ -0,0 +1 @@
+                    
\ No newline at end of file
diff --git a/crates/swc_fast_ts_strip/tests/fixture/issue-9396.transform.js b/crates/swc_fast_ts_strip/tests/fixture/issue-9396.transform.js
new file mode 100644
index 000000000000..2234b9cae16d
--- /dev/null
+++ b/crates/swc_fast_ts_strip/tests/fixture/issue-9396.transform.js
@@ -0,0 +1 @@
+export { };
diff --git a/crates/swc_fast_ts_strip/tests/fixture/issue-9396.ts b/crates/swc_fast_ts_strip/tests/fixture/issue-9396.ts
new file mode 100644
index 000000000000..061d64450fe4
--- /dev/null
+++ b/crates/swc_fast_ts_strip/tests/fixture/issue-9396.ts
@@ -0,0 +1 @@
+export function f();
\ No newline at end of file