fix(isolated-declarations): don't collect references when ExportNamedDeclaration has source (#5926)

crates/oxc_isolated_declarations/src/scope.rs

@@ -137,7 +137,8 @@ impl<'a> Visit<'a> for ScopeTree<'a> {
     fn visit_export_named_declaration(&mut self, decl: &ExportNamedDeclaration<'a>) {
         if let Some(declaration) = &decl.declaration {
             walk_declaration(self, declaration);
-        } else {
+        } else if decl.source.is_none() {
+            // export { ... }
             for specifier in &decl.specifiers {
                 if let Some(name) = specifier.local.identifier_name() {
                     self.add_type_reference(name.clone());

crates/oxc_isolated_declarations/tests/fixtures/eliminate-imports.ts

@@ -9,3 +9,5 @@ export const bar: (this: ThisType2) => void = function() {}
 import { type InferType1, type InferType2 } from 'infer';
 
 export type F<X extends InferType1> = X extends infer U extends InferType2 ? U : never
+
+export { Unused } from './unused';

crates/oxc_isolated_declarations/tests/snapshots/eliminate-imports.snap

@@ -12,3 +12,4 @@ export declare function foo(this: ThisType1 ): void;
 export declare const bar: (this: ThisType2 ) => void;
 import { type InferType1, type InferType2 } from "infer";
 export type F<X extends InferType1> = X extends infer U extends InferType2 ? U : never;
+export { Unused } from "./unused";