fix(isolated-declarations): bindings referenced in TSModuleDeclaration are removed incorrectly

crates/oxc_isolated_declarations/src/lib.rs

@@ -146,7 +146,10 @@ impl<'a> IsolatedDeclarations<'a> {
                             variable_transformed_indexes.push_back(FxHashSet::default());
                         }
                         Declaration::TSModuleDeclaration(decl) => {
-                            if decl.kind.is_global() {
+                            // declare global { ... } or declare module "foo" { ... }
+                            // We need to emit it anyway
+                            if decl.kind.is_global() || decl.id.is_string_literal() {
+                                // We need to visit the module declaration to collect all references
                                 self.scope.visit_ts_module_declaration(decl);
                                 transformed_indexes.insert(new_stmts.len());
                             }
@@ -293,11 +296,6 @@ impl<'a> IsolatedDeclarations<'a> {
                         new_ast_stmts.push(Statement::ImportDeclaration(decl));
                     }
                 }
-                Statement::TSModuleDeclaration(decl) => {
-                    if decl.kind.is_global() || decl.id.is_string_literal() {
-                        new_ast_stmts.push(Statement::TSModuleDeclaration(decl));
-                    }
-                }
                 _ => {}
             }
         }

crates/oxc_isolated_declarations/src/scope.rs

@@ -33,6 +33,7 @@ impl<'a> Scope<'a> {
 }
 
 /// Linear tree of declaration scopes.
+#[derive(Debug)]
 pub struct ScopeTree<'a> {
     levels: Vec<'a, Scope<'a>>,
 }

crates/oxc_isolated_declarations/tests/fixtures/module-declaration.ts

@@ -1,21 +1,31 @@
-import 'foo';
-declare module 'foo' {
-    interface Foo {}
-    const foo = 42;
+import "foo";
+declare module "foo" {
+  interface Foo {}
+  const foo = 42;
 }
 
 declare global {
-    interface Bar {}
-    const bar = 42 ;
+  interface Bar {}
+  const bar = 42;
+}
+
+import { type X } from "./x";
+type Y = 1;
+
+declare module "foo" {
+  interface Foo {
+    x: X;
+    y: Y;
+  }
 }
 
 // should not be emitted
 module baz {
-    interface Baz {}
-    const baz = 42;
+  interface Baz {}
+  const baz = 42;
 }
 
 declare module x {
-    interface Qux {}
-    const qux = 42;
+  interface Qux {}
+  const qux = 42;
 }

crates/oxc_isolated_declarations/tests/snapshots/module-declaration.snap

@@ -13,3 +13,12 @@ declare global {
 	interface Bar {}
 	const bar = 42;
 }
+import { type X } from "./x";
+type Y = 1;
+declare module "foo" {
+	interface Foo {
+		x: X;
+		y: Y;
+	}
+}
+export {};