impl

Author: kdy1

crates/swc_ecma_transformer/src/es2019/optional_catch_binding.rs

@@ -1,4 +1,6 @@
+use swc_ecma_ast::*;
 use swc_ecma_hooks::VisitMutHook;
+use swc_ecma_utils::private_ident;
 
 use crate::TraverseCtx;
 
@@ -8,4 +10,12 @@ pub fn hook() -> impl VisitMutHook<TraverseCtx> {
 
 struct OptionalCatchBindingPass {}
 
-impl VisitMutHook<TraverseCtx> for OptionalCatchBindingPass {}
+impl VisitMutHook<TraverseCtx> for OptionalCatchBindingPass {
+    fn enter_catch_clause(&mut self, node: &mut CatchClause, _: &mut TraverseCtx) {
+        if node.param.is_none() {
+            // TODO: Do not use private_ident! here.
+            // All private identifiers should be tracked using TraverseCtx.
+            node.param = Some(Pat::Ident(private_ident!("unused")));
+        }
+    }
+}