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use swc_ecma_ast::*; use swc_ecma_visit::{Fold, FoldWith}; struct OptionalCatchBinding; noop_fold_type!(OptionalCatchBinding); pub fn optional_catch_binding() -> impl Fold { OptionalCatchBinding } impl Fold for OptionalCatchBinding { fn fold_catch_clause(&mut self, mut cc: CatchClause) -> CatchClause { cc = cc.fold_children_with(self); if cc.param.is_some() { return cc; } CatchClause { param: Some(private_ident!("e").into()), ..cc } } } #[cfg(test)] mod tests { use super::optional_catch_binding as tr; test!( ::swc_ecma_parser::Syntax::default(), |_| tr(), issue_411, "try {} catch {}", "try {} catch(e) {}" ); }