From 4f9ab8151dad9984c81c72eb10c2afe5313a7591 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: Wed, 3 Apr 2024 11:33:25 +0900
Subject: [PATCH] fix(common): Fix source index for `inputSourceMap` (#8800)

**Related issue:**

 - Closes #8789
---
 crates/swc_common/src/source_map.rs | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/crates/swc_common/src/source_map.rs b/crates/swc_common/src/source_map.rs
index beccf76aca52..d1a951dfae9b 100644
--- a/crates/swc_common/src/source_map.rs
+++ b/crates/swc_common/src/source_map.rs
@@ -1225,7 +1225,7 @@ impl SourceMap {
         if let Some(orig) = orig {
             for src in orig.sources() {
                 let id = builder.add_source(src);
-                src_id = id + 1;
+                src_id = id;
 
                 builder.set_source_contents(id, orig.get_source_contents(id));
             }