Partial revert

crates/swc_ecma_minifier/src/compress/optimize/iife.rs

@@ -1,6 +1,6 @@
 use std::{collections::HashMap, mem::swap};
 
-use rustc_hash::{FxHashMap, FxHashSet};
+use rustc_hash::FxHashMap;
 use swc_common::{pass::Either, util::take::Take, Spanned, DUMMY_SP};
 use swc_ecma_ast::*;
 use swc_ecma_utils::{
@@ -157,35 +157,13 @@ impl Optimizer<'_> {
             }
         }
 
-        fn clean_params(callee: &mut Expr, vars: &FxHashSet<Id>) {
+        fn clean_params(callee: &mut Expr) {
             match callee {
                 Expr::Arrow(callee) => {
-                    for p in callee.params.iter_mut().rev() {
-                        if let Pat::Ident(param) = p {
-                            if vars.contains(&param.to_id()) {
-                                p.take();
-                                continue;
-                            }
-                        }
-
-                        break;
-                    }
-
                     // Drop invalid nodes
                     callee.params.retain(|p| !p.is_invalid())
                 }
                 Expr::Fn(callee) => {
-                    for p in callee.function.params.iter_mut().rev() {
-                        if let Pat::Ident(param) = &mut p.pat {
-                            if vars.contains(&param.to_id()) {
-                                p.pat.take();
-                                continue;
-                            }
-                        }
-
-                        break;
-                    }
-
                     // Drop invalid nodes
                     callee.function.params.retain(|p| !p.pat.is_invalid())
                 }
@@ -310,8 +288,6 @@ impl Optimizer<'_> {
                 return;
             }
 
-            let var_keys = vars.keys().cloned().collect();
-
             let ctx = Ctx {
                 in_fn_like: true,
                 top_level: false,
@@ -332,7 +308,7 @@ impl Optimizer<'_> {
                 }
             }
 
-            clean_params(callee, &var_keys);
+            clean_params(callee);
         }
     }