From c5acafe3869084a3f192a4aac0f120d5bb69e524 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Donny/=EA=B0=95=EB=8F=99=EC=9C=A4?= <kdy1997.dev@gmail.com>
Date: Sat, 6 Jul 2024 15:25:55 +0900
Subject: [PATCH] fix(es/typescript): Fix replacement logic of fast TS strip
 (#9163)

---
 crates/swc_fast_ts_strip/src/lib.rs                        | 7 ++++++-
 .../swc_fast_ts_strip/tests/fixture/declare-enum/simple.js | 4 +++-
 .../tests/fixture/declare-enum/with-init.js                | 5 ++++-
 crates/swc_fast_ts_strip/tests/fixture/test-1.js           | 5 +++++
 crates/swc_fast_ts_strip/tests/fixture/test-1.ts           | 5 +++++
 5 files changed, 23 insertions(+), 3 deletions(-)
 create mode 100644 crates/swc_fast_ts_strip/tests/fixture/test-1.js
 create mode 100644 crates/swc_fast_ts_strip/tests/fixture/test-1.ts

diff --git a/crates/swc_fast_ts_strip/src/lib.rs b/crates/swc_fast_ts_strip/src/lib.rs
index 7bbd7646b03b..197cce86612f 100644
--- a/crates/swc_fast_ts_strip/src/lib.rs
+++ b/crates/swc_fast_ts_strip/src/lib.rs
@@ -124,7 +124,12 @@ pub fn operate(
     let mut code = fm.src.to_string().into_bytes();
 
     for r in replacements {
-        code[(r.0 .0 - 1) as usize..(r.1 .0 - 1) as usize].fill(b' ');
+        for c in &mut code[(r.0 .0 - 1) as usize..(r.1 .0 - 1) as usize] {
+            if *c == b'\n' {
+                continue;
+            }
+            *c = b' ';
+        }
     }
 
     // Assert that removal does not overlap with each other
diff --git a/crates/swc_fast_ts_strip/tests/fixture/declare-enum/simple.js b/crates/swc_fast_ts_strip/tests/fixture/declare-enum/simple.js
index ad80c5a8877a..f8e2202758e3 100644
--- a/crates/swc_fast_ts_strip/tests/fixture/declare-enum/simple.js
+++ b/crates/swc_fast_ts_strip/tests/fixture/declare-enum/simple.js
@@ -1 +1,3 @@
-                          
\ No newline at end of file
+                  
+     
+ 
\ No newline at end of file
diff --git a/crates/swc_fast_ts_strip/tests/fixture/declare-enum/with-init.js b/crates/swc_fast_ts_strip/tests/fixture/declare-enum/with-init.js
index bc2ddb2b6b4b..c09b541c10b8 100644
--- a/crates/swc_fast_ts_strip/tests/fixture/declare-enum/with-init.js
+++ b/crates/swc_fast_ts_strip/tests/fixture/declare-enum/with-init.js
@@ -1 +1,4 @@
-                                      
\ No newline at end of file
+                  
+          
+      
+ 
\ No newline at end of file
diff --git a/crates/swc_fast_ts_strip/tests/fixture/test-1.js b/crates/swc_fast_ts_strip/tests/fixture/test-1.js
new file mode 100644
index 000000000000..e9e3251c601a
--- /dev/null
+++ b/crates/swc_fast_ts_strip/tests/fixture/test-1.js
@@ -0,0 +1,5 @@
+               
+               
+ 
+
+throw new Error('Whitespacing')
\ No newline at end of file
diff --git a/crates/swc_fast_ts_strip/tests/fixture/test-1.ts b/crates/swc_fast_ts_strip/tests/fixture/test-1.ts
new file mode 100644
index 000000000000..6c96a883a19e
--- /dev/null
+++ b/crates/swc_fast_ts_strip/tests/fixture/test-1.ts
@@ -0,0 +1,5 @@
+interface Foo {
+    bar: string
+}
+
+throw new Error('Whitespacing')
\ No newline at end of file