From 6a8dd8cbb384372657923d4c1094e8053661aa56 Mon Sep 17 00:00:00 2001
From: magic-akari <akari.ccino@gmail.com>
Date: Thu, 25 Jan 2024 15:19:20 +0800
Subject: [PATCH] fix(es/decorator): Skip TypeScript class method/prop
 declarations (#8555)

**Related issue:**

- Closes #8552
---
 .../tests/fixture/issues-8xxx/8552/input/.swcrc   | 13 +++++++++++++
 .../tests/fixture/issues-8xxx/8552/input/index.ts |  4 ++++
 .../fixture/issues-8xxx/8552/output/index.ts      |  2 ++
 .../src/decorator_2022_03.rs                      | 15 ++++++++++++---
 4 files changed, 31 insertions(+), 3 deletions(-)
 create mode 100644 crates/swc/tests/fixture/issues-8xxx/8552/input/.swcrc
 create mode 100644 crates/swc/tests/fixture/issues-8xxx/8552/input/index.ts
 create mode 100644 crates/swc/tests/fixture/issues-8xxx/8552/output/index.ts

diff --git a/crates/swc/tests/fixture/issues-8xxx/8552/input/.swcrc b/crates/swc/tests/fixture/issues-8xxx/8552/input/.swcrc
new file mode 100644
index 000000000000..26b3251c1873
--- /dev/null
+++ b/crates/swc/tests/fixture/issues-8xxx/8552/input/.swcrc
@@ -0,0 +1,13 @@
+{
+    "jsc": {
+        "parser": {
+            "syntax": "typescript",
+            "decorators": true
+        },
+        "transform": {
+            "decoratorVersion": "2022-03"
+        },
+        "target": "es2022"
+    },
+    "isModule": true
+}
\ No newline at end of file
diff --git a/crates/swc/tests/fixture/issues-8xxx/8552/input/index.ts b/crates/swc/tests/fixture/issues-8xxx/8552/input/index.ts
new file mode 100644
index 000000000000..da534c2a0747
--- /dev/null
+++ b/crates/swc/tests/fixture/issues-8xxx/8552/input/index.ts
@@ -0,0 +1,4 @@
+abstract class C {
+    abstract [Symbol.iterator]();
+    declare [Symbol.toStringTag];
+}
\ No newline at end of file
diff --git a/crates/swc/tests/fixture/issues-8xxx/8552/output/index.ts b/crates/swc/tests/fixture/issues-8xxx/8552/output/index.ts
new file mode 100644
index 000000000000..8ad54365639d
--- /dev/null
+++ b/crates/swc/tests/fixture/issues-8xxx/8552/output/index.ts
@@ -0,0 +1,2 @@
+class C {
+}
diff --git a/crates/swc_ecma_transforms_proposal/src/decorator_2022_03.rs b/crates/swc_ecma_transforms_proposal/src/decorator_2022_03.rs
index 5368144b84c9..fbdd8b6f1134 100644
--- a/crates/swc_ecma_transforms_proposal/src/decorator_2022_03.rs
+++ b/crates/swc_ecma_transforms_proposal/src/decorator_2022_03.rs
@@ -735,14 +735,14 @@ impl Decorator202203 {
     fn process_decorators_of_class_members(&mut self, members: &mut [ClassMember]) {
         for mut m in members {
             match &mut m {
-                ClassMember::Method(m) => {
+                ClassMember::Method(m) if m.function.body.is_some() => {
                     self.process_decorators(&mut m.function.decorators);
                     self.process_prop_name(&mut m.key);
                 }
-                ClassMember::PrivateMethod(m) => {
+                ClassMember::PrivateMethod(m) if m.function.body.is_some() => {
                     self.process_decorators(&mut m.function.decorators);
                 }
-                ClassMember::ClassProp(m) => {
+                ClassMember::ClassProp(m) if !m.declare => {
                     self.process_decorators(&mut m.decorators);
                     self.process_prop_name(&mut m.key);
                 }
@@ -1333,6 +1333,11 @@ impl VisitMut for Decorator202203 {
     }
 
     fn visit_mut_class_method(&mut self, n: &mut ClassMethod) {
+        // method without body is TypeScript's method declaration.
+        if n.function.body.is_none() {
+            return;
+        }
+
         n.visit_mut_children_with(self);
 
         if n.function.decorators.is_empty() {
@@ -1383,6 +1388,10 @@ impl VisitMut for Decorator202203 {
     }
 
     fn visit_mut_class_prop(&mut self, p: &mut ClassProp) {
+        if p.declare {
+            return;
+        }
+
         p.visit_mut_children_with(self);
 
         if p.decorators.is_empty() {