From bd1141da67467e5c588351c42133278552ff3e0c Mon Sep 17 00:00:00 2001
From: Dunqing <29533304+Dunqing@users.noreply.github.com>
Date: Sun, 30 Jun 2024 11:34:04 +0000
Subject: [PATCH] fix(isolated-declarations): if declarations is referenced in
 `declare global` then keep it (#3982)

close: #3981
---
 crates/oxc_isolated_declarations/src/lib.rs                | 1 +
 .../tests/fixtures/declare-global.ts                       | 7 +++++++
 .../tests/snapshots/declare-global.snap                    | 7 ++++++-
 3 files changed, 14 insertions(+), 1 deletion(-)

diff --git a/crates/oxc_isolated_declarations/src/lib.rs b/crates/oxc_isolated_declarations/src/lib.rs
index b6796334e42b1..9799618bbdf14 100644
--- a/crates/oxc_isolated_declarations/src/lib.rs
+++ b/crates/oxc_isolated_declarations/src/lib.rs
@@ -144,6 +144,7 @@ impl<'a> IsolatedDeclarations<'a> {
                         }
                         Declaration::TSModuleDeclaration(decl) => {
                             if decl.kind.is_global() {
+                                self.scope.visit_ts_module_declaration(decl);
                                 transformed_indexes.push(new_stmts.len());
                             }
                         }
diff --git a/crates/oxc_isolated_declarations/tests/fixtures/declare-global.ts b/crates/oxc_isolated_declarations/tests/fixtures/declare-global.ts
index c271fa55e7a99..fd994c73dcb10 100644
--- a/crates/oxc_isolated_declarations/tests/fixtures/declare-global.ts
+++ b/crates/oxc_isolated_declarations/tests/fixtures/declare-global.ts
@@ -1,4 +1,11 @@
+function MyFunction() {
+  return 'here is my function'
+}
+
 declare global {
+  interface Window {
+    MyFunction: typeof MyFunction
+  }
 }
 
 export {}
\ No newline at end of file
diff --git a/crates/oxc_isolated_declarations/tests/snapshots/declare-global.snap b/crates/oxc_isolated_declarations/tests/snapshots/declare-global.snap
index 51bbc0340e3e8..c62c684d53213 100644
--- a/crates/oxc_isolated_declarations/tests/snapshots/declare-global.snap
+++ b/crates/oxc_isolated_declarations/tests/snapshots/declare-global.snap
@@ -4,5 +4,10 @@ input_file: crates/oxc_isolated_declarations/tests/fixtures/declare-global.ts
 ---
 ==================== .D.TS ====================
 
-declare global {}
+declare function MyFunction(): string;
+declare global {
+	interface Window {
+		MyFunction: typeof MyFunction;
+	}
+}
 export {};