From 02ea19a3b77c71e5100b26d6c91c09157ddfcb5e Mon Sep 17 00:00:00 2001
From: Dunqing <29533304+Dunqing@users.noreply.github.com>
Date: Tue, 2 Jul 2024 13:47:29 +0000
Subject: [PATCH] fix(isolated-declarations): should emit `export {}` when only
 having `ImportDeclaration` (#4026)

close: #4023
---
 crates/oxc_isolated_declarations/src/lib.rs                | 2 +-
 .../tests/fixtures/empty-export2.ts                        | 1 +
 .../tests/snapshots/empty-export2.snap                     | 7 +++++++
 3 files changed, 9 insertions(+), 1 deletion(-)
 create mode 100644 crates/oxc_isolated_declarations/tests/fixtures/empty-export2.ts
 create mode 100644 crates/oxc_isolated_declarations/tests/snapshots/empty-export2.snap

diff --git a/crates/oxc_isolated_declarations/src/lib.rs b/crates/oxc_isolated_declarations/src/lib.rs
index 9799618bbdf14..187b0c09d817b 100644
--- a/crates/oxc_isolated_declarations/src/lib.rs
+++ b/crates/oxc_isolated_declarations/src/lib.rs
@@ -317,7 +317,7 @@ impl<'a> IsolatedDeclarations<'a> {
             }
         }
 
-        if last_transformed_len == transformed_indexes.len() {
+        if !transformed_indexes.is_empty() && last_transformed_len == transformed_indexes.len() {
             need_empty_export_marker = false;
         }
 
diff --git a/crates/oxc_isolated_declarations/tests/fixtures/empty-export2.ts b/crates/oxc_isolated_declarations/tests/fixtures/empty-export2.ts
new file mode 100644
index 0000000000000..17abd44386b75
--- /dev/null
+++ b/crates/oxc_isolated_declarations/tests/fixtures/empty-export2.ts
@@ -0,0 +1 @@
+import * as a from "mod";
\ No newline at end of file
diff --git a/crates/oxc_isolated_declarations/tests/snapshots/empty-export2.snap b/crates/oxc_isolated_declarations/tests/snapshots/empty-export2.snap
new file mode 100644
index 0000000000000..8092831a17fac
--- /dev/null
+++ b/crates/oxc_isolated_declarations/tests/snapshots/empty-export2.snap
@@ -0,0 +1,7 @@
+---
+source: crates/oxc_isolated_declarations/tests/mod.rs
+input_file: crates/oxc_isolated_declarations/tests/fixtures/empty-export2.ts
+---
+==================== .D.TS ====================
+
+export {};