diff --git a/crates/swc_ecma_minifier/src/compress/optimize/iife.rs b/crates/swc_ecma_minifier/src/compress/optimize/iife.rs
index e57461436703..3f9e4fb6e1a2 100644
--- a/crates/swc_ecma_minifier/src/compress/optimize/iife.rs
+++ b/crates/swc_ecma_minifier/src/compress/optimize/iife.rs
@@ -430,7 +430,9 @@ impl Optimizer<'_> {
     pub(super) fn invoke_iife(&mut self, e: &mut Expr) {
         trace_op!("iife: invoke_iife");
 
-        if self.options.inline == 0 {
+        if self.options.inline == 0
+            && !(self.options.reduce_vars && self.options.reduce_fns && self.options.evaluate)
+        {
             let skip = match e {
                 Expr::Call(v) => !v.callee.span().is_dummy(),
                 _ => true,
diff --git a/crates/swc_ecma_minifier/src/compress/optimize/mod.rs b/crates/swc_ecma_minifier/src/compress/optimize/mod.rs
index 820888ed1a3b..5a7704819749 100644
--- a/crates/swc_ecma_minifier/src/compress/optimize/mod.rs
+++ b/crates/swc_ecma_minifier/src/compress/optimize/mod.rs
@@ -31,7 +31,7 @@ use crate::{
     maybe_par,
     mode::Mode,
     option::{CompressOptions, MangleOptions},
-    program_data::ProgramData,
+    program_data::{ProgramData, VarUsageInfo},
     util::{
         contains_eval, contains_leaping_continue_with_label, make_number, ExprOptExt, ModuleItemExt,
     },
@@ -323,7 +323,7 @@ impl From<&Function> for FnMetadata {
 
 impl Optimizer<'_> {
     fn may_remove_ident(&self, id: &Ident) -> bool {
-        if self.ctx.is_exported {
+        if let Some(VarUsageInfo { exported: true, .. }) = self.data.vars.get(&id.clone().to_id()) {
             return false;
         }
 
@@ -2041,6 +2041,7 @@ impl VisitMut for Optimizer<'_> {
 
         let ctx = Ctx {
             top_level: false,
+            in_fn_like: true,
             is_lhs_of_assign: false,
             is_exact_lhs_of_assign: false,
             ..self.ctx
@@ -2062,7 +2063,14 @@ impl VisitMut for Optimizer<'_> {
             }
         }
 
-        e.visit_mut_children_with(self);
+        let ctx = Ctx {
+            top_level: false,
+            in_fn_like: true,
+            is_lhs_of_assign: false,
+            is_exact_lhs_of_assign: false,
+            ..self.ctx
+        };
+        e.visit_mut_children_with(&mut *self.with_ctx(ctx));
     }
 
     #[cfg_attr(feature = "debug", tracing::instrument(skip_all))]
diff --git a/crates/swc_ecma_minifier/src/compress/optimize/sequences.rs b/crates/swc_ecma_minifier/src/compress/optimize/sequences.rs
index 946714199bdb..eedfdd1050f1 100644
--- a/crates/swc_ecma_minifier/src/compress/optimize/sequences.rs
+++ b/crates/swc_ecma_minifier/src/compress/optimize/sequences.rs
@@ -557,7 +557,16 @@ impl Optimizer<'_> {
         options: &CompressOptions,
     ) -> Option<Vec<Mergable<'a>>> {
         Some(match s {
-            Stmt::Expr(e) => vec![Mergable::Expr(&mut e.expr)],
+            Stmt::Expr(e) => {
+                if self.options.sequences()
+                    || self.options.collapse_vars
+                    || self.options.side_effects
+                {
+                    vec![Mergable::Expr(&mut e.expr)]
+                } else {
+                    return None;
+                }
+            }
             Stmt::Decl(Decl::Var(v)) => {
                 if options.reduce_vars || options.collapse_vars {
                     v.decls.iter_mut().map(Mergable::Var).collect()
@@ -612,7 +621,7 @@ impl Optimizer<'_> {
     where
         T: ModuleItemExt,
     {
-        if !self.options.sequences() && !self.options.collapse_vars {
+        if !self.options.sequences() && !self.options.collapse_vars && !self.options.reduce_vars {
             log_abort!("sequences: [x] Disabled");
             return;
         }
@@ -1513,6 +1522,16 @@ impl Optimizer<'_> {
             )
         };
 
+        // Respect top_retain
+        if let Some(a_id) = a.id() {
+            if a_id.0 == "arguments"
+                || (matches!(a, Mergable::Var(_) | Mergable::FnDecl(_))
+                    && !self.may_remove_ident(&Ident::from(a_id)))
+            {
+                return Ok(false);
+            }
+        }
+
         if match &*b {
             Expr::Arrow(..)
             | Expr::Fn(..)
diff --git a/crates/swc_ecma_minifier/tests/TODO.txt b/crates/swc_ecma_minifier/tests/TODO.txt
index 36c51d818c38..52ba12010a4d 100644
--- a/crates/swc_ecma_minifier/tests/TODO.txt
+++ b/crates/swc_ecma_minifier/tests/TODO.txt
@@ -43,7 +43,6 @@ collapse_vars/issue_1858/input.js
 collapse_vars/issue_2187_2/input.js
 collapse_vars/issue_2203_2/input.js
 collapse_vars/issue_2203_4/input.js
-collapse_vars/issue_2298/input.js
 collapse_vars/issue_2319_1/input.js
 collapse_vars/issue_2319_3/input.js
 collapse_vars/issue_2436_1/input.js
@@ -119,11 +118,8 @@ drop_unused/issue_2660_2/input.js
 drop_unused/issue_2665/input.js
 drop_unused/issue_2846/input.js
 drop_unused/issue_t161_top_retain_10/input.js
-drop_unused/issue_t161_top_retain_11/input.js
 drop_unused/issue_t161_top_retain_12/input.js
 drop_unused/issue_t161_top_retain_15/input.js
-drop_unused/issue_t161_top_retain_8/input.js
-drop_unused/issue_t161_top_retain_9/input.js
 drop_unused/issue_t183/input.js
 drop_unused/keep_assign/input.js
 drop_unused/reassign_const/input.js
@@ -159,7 +155,6 @@ functions/issue_2107/input.js
 functions/issue_2114_1/input.js
 functions/issue_2114_2/input.js
 functions/issue_2601_2/input.js
-functions/issue_2604_2/input.js
 functions/issue_2620_2/input.js
 functions/issue_2620_3/input.js
 functions/issue_2630_2/input.js
@@ -297,13 +292,8 @@ reduce_vars/iife/input.js
 reduce_vars/iife_new/input.js
 reduce_vars/inner_var_for_2/input.js
 reduce_vars/inverted_var/input.js
-reduce_vars/issue_1595_3/input.js
-reduce_vars/issue_1670_2/input.js
-reduce_vars/issue_1670_4/input.js
-reduce_vars/issue_1670_5/input.js
 reduce_vars/issue_1850_2/input.js
 reduce_vars/issue_2485/input.js
-reduce_vars/issue_2757_1/input.js
 reduce_vars/issue_2799_2/input.js
 reduce_vars/issue_2836/input.js
 reduce_vars/issue_2860_2/input.js
diff --git a/crates/swc_ecma_minifier/tests/fixture/next/56408/output.js b/crates/swc_ecma_minifier/tests/fixture/next/56408/output.js
index 2c2202d78dbc..603cb4ee2579 100644
--- a/crates/swc_ecma_minifier/tests/fixture/next/56408/output.js
+++ b/crates/swc_ecma_minifier/tests/fixture/next/56408/output.js
@@ -4,9 +4,7 @@ exports.ids = [
 ];
 exports.modules = {
     4622: function(e, t, n) {
-        !function(e, i) {
-            i(t, n(9885), n(5601));
-        }(0, function(e, t, n) {
+        void function(e, t, n) {
             "use strict";
             function r(e) {
                 return e && "object" == typeof e && "default" in e ? e : {
@@ -677,8 +675,7 @@ exports.modules = {
             function P(e) {
                 var t = e.getAsFile();
                 if (!t) return Promise.reject("".concat(e, " is not a File"));
-                var n = h(t);
-                return Promise.resolve(n);
+                return Promise.resolve(h(t));
             }
             function S(e) {
                 return v(this, void 0, void 0, function() {
@@ -754,8 +751,7 @@ exports.modules = {
                             2,
                             new Promise(function(t, n) {
                                 e.file(function(n) {
-                                    var i = h(n, e.fullPath);
-                                    t(i);
+                                    t(h(n, e.fullPath));
                                 }, function(e) {
                                     n(e);
                                 });
@@ -765,8 +761,7 @@ exports.modules = {
                 });
             }
             var T = "file-invalid-type", I = "file-too-large", M = "file-too-small", L = "too-many-files", _ = function(e) {
-                e = Array.isArray(e) && 1 === e.length ? e[0] : e;
-                var t = Array.isArray(e) ? "one of ".concat(e.join(", ")) : e;
+                var t = Array.isArray(e = Array.isArray(e) && 1 === e.length ? e[0] : e) ? "one of ".concat(e.join(", ")) : e;
                 return {
                     code: T,
                     message: "File type must be ".concat(t)
@@ -947,9 +942,7 @@ exports.modules = {
                             return D(e) && D(e.dataTransfer) ? [
                                 2,
                                 j(e.dataTransfer, e.type)
-                            ] : function(e) {
-                                return D(e) && D(e.target);
-                            }(e) ? [
+                            ] : D(e) && D(e.target) ? [
                                 2,
                                 x(e)
                             ] : Array.isArray(e) && e.every(function(e) {
@@ -1030,9 +1023,9 @@ exports.modules = {
                     return "function" == typeof es ? es : me;
                 }, [
                     es
-                ]), eF = t.useRef(null), ej = t.useRef(null), ek = t.useReducer(ve, ec), eE = s(ek, 2), eP = eE[0], eC = eE[1], eS = eP.isFocused, ez = eP.isFileDialogActive, eR = t.useRef("undefined" != typeof window && window.isSecureContext && ep && Z()), ie = function() {
-                    !eR.current && ez && setTimeout(function() {
-                        ej.current && (ej.current.files.length || (eC({
+                ]), eF = t.useRef(null), ej = t.useRef(null), ek = s(t.useReducer(ve, ec), 2), eE = ek[0], eP = ek[1], eC = eE.isFocused, eS = eE.isFileDialogActive, ez = t.useRef("undefined" != typeof window && window.isSecureContext && ep && Z()), ie = function() {
+                    !ez.current && eS && setTimeout(function() {
+                        ej.current && (ej.current.files.length || (eP({
                             type: "closeDialog"
                         }), eO()));
                     }, 300);
@@ -1043,12 +1036,12 @@ exports.modules = {
                     };
                 }, [
                     ej,
-                    ez,
+                    eS,
                     eO,
-                    eR
+                    ez
                 ]);
-                var eT = t.useRef([]), ce = function(e) {
-                    eF.current && eF.current.contains(e.target) || (e.preventDefault(), eT.current = []);
+                var eR = t.useRef([]), ce = function(e) {
+                    eF.current && eF.current.contains(e.target) || (e.preventDefault(), eR.current = []);
                 };
                 t.useEffect(function() {
                     return ev && (document.addEventListener("dragover", Y, !1), document.addEventListener("drop", ce, !1)), function() {
@@ -1064,12 +1057,12 @@ exports.modules = {
                     ed,
                     b
                 ]);
-                var eI = t.useCallback(function(e) {
+                var eT = t.useCallback(function(e) {
                     eh ? eh(e) : console.error(e);
                 }, [
                     eh
-                ]), eM = t.useCallback(function(e) {
-                    e.preventDefault(), e.persist(), ke(e), eT.current = [].concat(f(eT.current), [
+                ]), eI = t.useCallback(function(e) {
+                    e.preventDefault(), e.persist(), ke(e), eR.current = [].concat(f(eR.current), [
                         e.target
                     ]), N(e) && Promise.resolve(w(e)).then(function(t) {
                         if (!H(e) || eb) {
@@ -1082,7 +1075,7 @@ exports.modules = {
                                 maxFiles: M,
                                 validator: eD
                             });
-                            eC({
+                            eP({
                                 isDragAccept: i,
                                 isDragReject: n > 0 && !i,
                                 isDragActive: !0,
@@ -1090,12 +1083,12 @@ exports.modules = {
                             }), L && L(e);
                         }
                     }).catch(function(e) {
-                        return eI(e);
+                        return eT(e);
                     });
                 }, [
                     w,
                     L,
-                    eI,
+                    eT,
                     eb,
                     ew,
                     T,
@@ -1103,7 +1096,7 @@ exports.modules = {
                     I,
                     M,
                     eD
-                ]), eL = t.useCallback(function(e) {
+                ]), eM = t.useCallback(function(e) {
                     e.preventDefault(), e.persist(), ke(e);
                     var t = N(e);
                     if (t && e.dataTransfer) try {
@@ -1113,12 +1106,12 @@ exports.modules = {
                 }, [
                     en,
                     eb
-                ]), e_ = t.useCallback(function(e) {
+                ]), eL = t.useCallback(function(e) {
                     e.preventDefault(), e.persist(), ke(e);
-                    var t = eT.current.filter(function(e) {
+                    var t = eR.current.filter(function(e) {
                         return eF.current && eF.current.contains(e);
                     }), n = t.indexOf(e.target);
-                    -1 !== n && t.splice(n, 1), eT.current = t, t.length > 0 || (eC({
+                    -1 !== n && t.splice(n, 1), eR.current = t, t.length > 0 || (eP({
                         type: "setDraggedFiles",
                         isDragActive: !1,
                         isDragAccept: !1,
@@ -1128,7 +1121,7 @@ exports.modules = {
                     eF,
                     et,
                     eb
-                ]), eB = t.useCallback(function(e, t) {
+                ]), e_ = t.useCallback(function(e, t) {
                     var n = [], i = [];
                     e.forEach(function(e) {
                         var t = s(U(e, ew), 2), b = t[0], w = t[1], I = s(W(e, T, R), 2), M = I[0], L = I[1], q = eD ? eD(e) : null;
@@ -1152,13 +1145,13 @@ exports.modules = {
                                 q
                             ]
                         });
-                    }), n.splice(0)), eC({
+                    }), n.splice(0)), eP({
                         acceptedFiles: n,
                         fileRejections: i,
                         type: "setFiles"
                     }), ei && ei(n, i, t), i.length > 0 && el && el(i, t), n.length > 0 && eu && eu(n, t);
                 }, [
-                    eC,
+                    eP,
                     I,
                     ew,
                     T,
@@ -1168,22 +1161,22 @@ exports.modules = {
                     eu,
                     el,
                     eD
-                ]), eK = t.useCallback(function(e) {
-                    e.preventDefault(), e.persist(), ke(e), eT.current = [], N(e) && Promise.resolve(w(e)).then(function(t) {
-                        H(e) && !eb || eB(t, e);
+                ]), eB = t.useCallback(function(e) {
+                    e.preventDefault(), e.persist(), ke(e), eR.current = [], N(e) && Promise.resolve(w(e)).then(function(t) {
+                        H(e) && !eb || e_(t, e);
                     }).catch(function(e) {
-                        return eI(e);
-                    }), eC({
+                        return eT(e);
+                    }), eP({
                         type: "reset"
                     });
                 }, [
                     w,
-                    eB,
-                    eI,
+                    e_,
+                    eT,
                     eb
-                ]), e$ = t.useCallback(function() {
-                    if (eR.current) {
-                        eC({
+                ]), eK = t.useCallback(function() {
+                    if (ez.current) {
+                        eP({
                             type: "openDialog"
                         }), eA();
                         window.showOpenFilePicker({
@@ -1192,44 +1185,44 @@ exports.modules = {
                         }).then(function(e) {
                             return w(e);
                         }).then(function(e) {
-                            eB(e, null), eC({
+                            e_(e, null), eP({
                                 type: "closeDialog"
                             });
                         }).catch(function(e) {
-                            ne(e) ? (eO(e), eC({
+                            ne(e) ? (eO(e), eP({
                                 type: "closeDialog"
-                            })) : re(e) ? (eR.current = !1, ej.current ? (ej.current.value = null, ej.current.click()) : eI(Error("Cannot open the file picker because the https://developer.mozilla.org/en-US/docs/Web/API/File_System_Access_API is not supported and no <input> was provided."))) : eI(e);
+                            })) : re(e) ? (ez.current = !1, ej.current ? (ej.current.value = null, ej.current.click()) : eT(Error("Cannot open the file picker because the https://developer.mozilla.org/en-US/docs/Web/API/File_System_Access_API is not supported and no <input> was provided."))) : eT(e);
                         });
-                    } else ej.current && (eC({
+                    } else ej.current && (eP({
                         type: "openDialog"
                     }), eA(), ej.current.value = null, ej.current.click());
                 }, [
-                    eC,
+                    eP,
                     eA,
                     eO,
                     ep,
-                    eB,
-                    eI,
+                    e_,
+                    eT,
                     ex,
                     I
-                ]), eX = t.useCallback(function(e) {
-                    eF.current && eF.current.isEqualNode(e.target) && (" " !== e.key && "Enter" !== e.key && 32 !== e.keyCode && 13 !== e.keyCode || (e.preventDefault(), e$()));
+                ]), e$ = t.useCallback(function(e) {
+                    eF.current && eF.current.isEqualNode(e.target) && (" " !== e.key && "Enter" !== e.key && 32 !== e.keyCode && 13 !== e.keyCode || (e.preventDefault(), eK()));
                 }, [
                     eF,
-                    e$
-                ]), eH = t.useCallback(function() {
-                    eC({
+                    eK
+                ]), eX = t.useCallback(function() {
+                    eP({
                         type: "focus"
                     });
-                }, []), eN = t.useCallback(function() {
-                    eC({
+                }, []), eH = t.useCallback(function() {
+                    eP({
                         type: "blur"
                     });
-                }, []), eU = t.useCallback(function() {
-                    em || (V() ? setTimeout(e$, 0) : e$());
+                }, []), eN = t.useCallback(function() {
+                    em || (V() ? setTimeout(eK, 0) : eK());
                 }, [
                     em,
-                    e$
+                    eK
                 ]), Ae = function(e) {
                     return b ? null : e;
                 }, Oe = function(e) {
@@ -1238,18 +1231,18 @@ exports.modules = {
                     return ey ? null : Ae(e);
                 }, ke = function(e) {
                     eb && e.stopPropagation();
-                }, eW = t.useMemo(function() {
+                }, eU = t.useMemo(function() {
                     return function() {
                         var e = arguments.length > 0 && void 0 !== arguments[0] ? arguments[0] : {}, t = e.refKey, n = e.role, i = e.onKeyDown, w = e.onFocus, R = e.onBlur, T = e.onClick, I = e.onDragEnter, M = e.onDragOver, L = e.onDragLeave, q = e.onDrop, et = l(e, er);
                         return c(c(u({
-                            onKeyDown: Oe(X(i, eX)),
-                            onFocus: Oe(X(w, eH)),
-                            onBlur: Oe(X(R, eN)),
-                            onClick: Ae(X(T, eU)),
-                            onDragEnter: Ee(X(I, eM)),
-                            onDragOver: Ee(X(M, eL)),
-                            onDragLeave: Ee(X(L, e_)),
-                            onDrop: Ee(X(q, eK)),
+                            onKeyDown: Oe(X(i, e$)),
+                            onFocus: Oe(X(w, eX)),
+                            onBlur: Oe(X(R, eH)),
+                            onClick: Ae(X(T, eN)),
+                            onDragEnter: Ee(X(I, eI)),
+                            onDragOver: Ee(X(M, eM)),
+                            onDragLeave: Ee(X(L, eL)),
+                            onDrop: Ee(X(q, eB)),
                             role: "string" == typeof n && "" !== n ? n : "presentation"
                         }, void 0 === t ? "ref" : t, eF), b || eg ? {} : {
                             tabIndex: 0
@@ -1257,48 +1250,48 @@ exports.modules = {
                     };
                 }, [
                     eF,
+                    e$,
                     eX,
                     eH,
                     eN,
-                    eU,
+                    eI,
                     eM,
                     eL,
-                    e_,
-                    eK,
+                    eB,
                     eg,
                     ey,
                     b
-                ]), eG = t.useCallback(function(e) {
+                ]), eW = t.useCallback(function(e) {
                     e.stopPropagation();
-                }, []), eY = t.useMemo(function() {
+                }, []), eG = t.useMemo(function() {
                     return function() {
-                        var e = arguments.length > 0 && void 0 !== arguments[0] ? arguments[0] : {}, t = e.refKey, n = e.onChange, i = e.onClick, b = l(e, eo), w = u({
+                        var e = arguments.length > 0 && void 0 !== arguments[0] ? arguments[0] : {}, t = e.refKey, n = e.onChange, i = e.onClick, b = l(e, eo);
+                        return c(c({}, u({
                             accept: ew,
                             multiple: I,
                             type: "file",
                             style: {
                                 display: "none"
                             },
-                            onChange: Ae(X(n, eK)),
-                            onClick: Ae(X(i, eG)),
+                            onChange: Ae(X(n, eB)),
+                            onClick: Ae(X(i, eW)),
                             tabIndex: -1
-                        }, void 0 === t ? "ref" : t, ej);
-                        return c(c({}, w), b);
+                        }, void 0 === t ? "ref" : t, ej)), b);
                     };
                 }, [
                     ej,
                     i,
                     I,
-                    eK,
+                    eB,
                     b
                 ]);
-                return c(c({}, eP), {}, {
-                    isFocused: eS && !b,
-                    getRootProps: eW,
-                    getInputProps: eY,
+                return c(c({}, eE), {}, {
+                    isFocused: eC && !b,
+                    getRootProps: eU,
+                    getInputProps: eG,
                     rootRef: eF,
                     inputRef: ej,
-                    open: Ae(e$)
+                    open: Ae(eK)
                 });
             }
             function ve(e, t) {
@@ -1345,6 +1338,6 @@ exports.modules = {
             }, e.default = ei, e.useDropzone = de, Object.defineProperty(e, "__esModule", {
                 value: !0
             });
-        });
+        }(t, n(9885), n(5601));
     }
 };
diff --git a/crates/swc_ecma_minifier/tests/passing.txt b/crates/swc_ecma_minifier/tests/passing.txt
index ab0647af1078..252de272a74b 100644
--- a/crates/swc_ecma_minifier/tests/passing.txt
+++ b/crates/swc_ecma_minifier/tests/passing.txt
@@ -188,6 +188,7 @@ collapse_vars/issue_2203_1/input.js
 collapse_vars/issue_2203_3/input.js
 collapse_vars/issue_2250_1/input.js
 collapse_vars/issue_2250_2/input.js
+collapse_vars/issue_2298/input.js
 collapse_vars/issue_2313_1/input.js
 collapse_vars/issue_2313_2/input.js
 collapse_vars/issue_2319_2/input.js
@@ -459,6 +460,7 @@ drop_unused/issue_3192/input.js
 drop_unused/issue_805_1/input.js
 drop_unused/issue_805_2/input.js
 drop_unused/issue_t161_top_retain_1/input.js
+drop_unused/issue_t161_top_retain_11/input.js
 drop_unused/issue_t161_top_retain_13/input.js
 drop_unused/issue_t161_top_retain_14/input.js
 drop_unused/issue_t161_top_retain_2/input.js
@@ -467,6 +469,8 @@ drop_unused/issue_t161_top_retain_4/input.js
 drop_unused/issue_t161_top_retain_5/input.js
 drop_unused/issue_t161_top_retain_6/input.js
 drop_unused/issue_t161_top_retain_7/input.js
+drop_unused/issue_t161_top_retain_8/input.js
+drop_unused/issue_t161_top_retain_9/input.js
 drop_unused/keep_fnames/input.js
 drop_unused/unused_block_decls/input.js
 drop_unused/unused_block_decls_in_catch/input.js
@@ -624,6 +628,7 @@ functions/issue_2531_2/input.js
 functions/issue_2531_3/input.js
 functions/issue_2601_1/input.js
 functions/issue_2604_1/input.js
+functions/issue_2604_2/input.js
 functions/issue_2616/input.js
 functions/issue_2620_1/input.js
 functions/issue_2620_4/input.js
@@ -1308,10 +1313,14 @@ reduce_vars/issue_1533_1/input.js
 reduce_vars/issue_1533_2/input.js
 reduce_vars/issue_1595_1/input.js
 reduce_vars/issue_1595_2/input.js
+reduce_vars/issue_1595_3/input.js
 reduce_vars/issue_1595_4/input.js
 reduce_vars/issue_1606/input.js
 reduce_vars/issue_1670_1/input.js
+reduce_vars/issue_1670_2/input.js
 reduce_vars/issue_1670_3/input.js
+reduce_vars/issue_1670_4/input.js
+reduce_vars/issue_1670_5/input.js
 reduce_vars/issue_1670_6/input.js
 reduce_vars/issue_1814_1/input.js
 reduce_vars/issue_1814_2/input.js
@@ -1352,6 +1361,7 @@ reduce_vars/issue_2496/input.js
 reduce_vars/issue_2598/input.js
 reduce_vars/issue_2669/input.js
 reduce_vars/issue_2670/input.js
+reduce_vars/issue_2757_1/input.js
 reduce_vars/issue_2757_2/input.js
 reduce_vars/issue_2774/input.js
 reduce_vars/issue_2799_1/input.js
diff --git a/crates/swc_ecma_minifier/tests/terser/compress/drop_unused/issue_t161_top_retain_14/output.js b/crates/swc_ecma_minifier/tests/terser/compress/drop_unused/issue_t161_top_retain_14/output.js
index ffc287766515..3fc81a2d17f3 100644
--- a/crates/swc_ecma_minifier/tests/terser/compress/drop_unused/issue_t161_top_retain_14/output.js
+++ b/crates/swc_ecma_minifier/tests/terser/compress/drop_unused/issue_t161_top_retain_14/output.js
@@ -4,7 +4,7 @@ class Alpha {
     }
 }
 let x = 2, z = 4;
-console.log(2, 3, 4, 6, 8, 12, 2, 3, 4, new Alpha().num(), new class {
+console.log(2, 3, z, 6, 2 * z, 3 * z, 2, 3, z, new Alpha().num(), new class {
     num() {
         return 3;
     }
diff --git a/crates/swc_ecma_minifier/tests/terser/compress/drop_unused/issue_t161_top_retain_3/output.js b/crates/swc_ecma_minifier/tests/terser/compress/drop_unused/issue_t161_top_retain_3/output.js
index 2f276ce45e88..446e64265475 100644
--- a/crates/swc_ecma_minifier/tests/terser/compress/drop_unused/issue_t161_top_retain_3/output.js
+++ b/crates/swc_ecma_minifier/tests/terser/compress/drop_unused/issue_t161_top_retain_3/output.js
@@ -1 +1,4 @@
-console.log(2, 3);
+function f() {
+    return 2;
+}
+console.log(f(), 3);
diff --git a/crates/swc_ecma_minifier/tests/terser/compress/drop_unused/vardef_value/output.js b/crates/swc_ecma_minifier/tests/terser/compress/drop_unused/vardef_value/output.js
index c1ac28d23483..528a05163fdf 100644
--- a/crates/swc_ecma_minifier/tests/terser/compress/drop_unused/vardef_value/output.js
+++ b/crates/swc_ecma_minifier/tests/terser/compress/drop_unused/vardef_value/output.js
@@ -1,6 +1,5 @@
 function f() {
-    var a = (function () {
+    return (function() {
         return x();
-    })();
-    return a(42);
+    })()(42);
 }
diff --git a/crates/swc_ecma_minifier/tests/terser/compress/functions/issue_2663_3/output.js b/crates/swc_ecma_minifier/tests/terser/compress/functions/issue_2663_3/output.js
index 510f9716e3a9..d135a3374f16 100644
--- a/crates/swc_ecma_minifier/tests/terser/compress/functions/issue_2663_3/output.js
+++ b/crates/swc_ecma_minifier/tests/terser/compress/functions/issue_2663_3/output.js
@@ -1,12 +1,11 @@
 (function(outputs) {
     var handlers = [];
     for(var i = 0; i < outputs.length; i++){
-        var output = outputs[i];
         var handleEventClosure = function(eventName) {
             return function() {
                 return console.log(eventName);
             };
-        }(output.eventName);
+        }(outputs[i].eventName);
         handlers.push(handleEventClosure);
     }
     return handlers;
diff --git a/crates/swc_ecma_minifier/tests/terser/compress/functions/issue_2842/output.js b/crates/swc_ecma_minifier/tests/terser/compress/functions/issue_2842/output.js
index 1c76575b74c2..6d3b61fb0b31 100644
--- a/crates/swc_ecma_minifier/tests/terser/compress/functions/issue_2842/output.js
+++ b/crates/swc_ecma_minifier/tests/terser/compress/functions/issue_2842/output.js
@@ -1,14 +1,11 @@
 (function() {
     (function() {
-        {
-            const data = function(data) {
-                return data[data[0]];
-            }([
-                1,
-                2,
-                3
-            ]);
-            console.log(data);
-        }
+        console.log(function(data) {
+            return data[data[0]];
+        }([
+            1,
+            2,
+            3
+        ]));
     })();
 })();
diff --git a/crates/swc_ecma_minifier/tests/terser/compress/issue_1609/chained_evaluation_1/output.js b/crates/swc_ecma_minifier/tests/terser/compress/issue_1609/chained_evaluation_1/output.js
index 5190f9d8d7e4..9a4742864df4 100644
--- a/crates/swc_ecma_minifier/tests/terser/compress/issue_1609/chained_evaluation_1/output.js
+++ b/crates/swc_ecma_minifier/tests/terser/compress/issue_1609/chained_evaluation_1/output.js
@@ -1,5 +1 @@
-(function () {
-    (function () {
-        f(1).bar = 1;
-    })();
-})();
+f(1).bar = 1;
diff --git a/crates/swc_ecma_minifier/tests/terser/compress/issue_1609/chained_evaluation_2/output.js b/crates/swc_ecma_minifier/tests/terser/compress/issue_1609/chained_evaluation_2/output.js
index 90abd344fc0f..127fc602c90e 100644
--- a/crates/swc_ecma_minifier/tests/terser/compress/issue_1609/chained_evaluation_2/output.js
+++ b/crates/swc_ecma_minifier/tests/terser/compress/issue_1609/chained_evaluation_2/output.js
@@ -1,6 +1,4 @@
-(function () {
-    (function () {
-        var b = "long piece of string";
-        f(b).bar = b;
-    })();
+(function() {
+    var b;
+    b = "long piece of string", f(b).bar = b;
 })();
diff --git a/crates/swc_ecma_minifier/tests/terser/compress/issue_1656/f7/output.js b/crates/swc_ecma_minifier/tests/terser/compress/issue_1656/f7/output.js
index 1dc131a91fdb..223ae0cd40b3 100644
--- a/crates/swc_ecma_minifier/tests/terser/compress/issue_1656/f7/output.js
+++ b/crates/swc_ecma_minifier/tests/terser/compress/issue_1656/f7/output.js
@@ -1,4 +1,2 @@
 var b = 10;
-!function() {
-    b = 100;
-}(), console.log(100, b);
+console.log(100, b = 100);
diff --git a/crates/swc_ecma_minifier/tests/terser/compress/reduce_vars/boolean_binary_assign/output.js b/crates/swc_ecma_minifier/tests/terser/compress/reduce_vars/boolean_binary_assign/output.js
index 915e71b8c6b4..4df86f06d751 100644
--- a/crates/swc_ecma_minifier/tests/terser/compress/reduce_vars/boolean_binary_assign/output.js
+++ b/crates/swc_ecma_minifier/tests/terser/compress/reduce_vars/boolean_binary_assign/output.js
@@ -1,4 +1,4 @@
-!(function () {
+!function() {
     var a;
     console.log(a);
-})();
+}();
diff --git a/crates/swc_ecma_minifier/tests/terser/compress/reduce_vars/cond_assign/output.js b/crates/swc_ecma_minifier/tests/terser/compress/reduce_vars/cond_assign/output.js
index 915e71b8c6b4..4df86f06d751 100644
--- a/crates/swc_ecma_minifier/tests/terser/compress/reduce_vars/cond_assign/output.js
+++ b/crates/swc_ecma_minifier/tests/terser/compress/reduce_vars/cond_assign/output.js
@@ -1,4 +1,4 @@
-!(function () {
+!function() {
     var a;
     console.log(a);
-})();
+}();
diff --git a/crates/swc_ecma_minifier/tests/terser/compress/reduce_vars/defun_reference/output.js b/crates/swc_ecma_minifier/tests/terser/compress/reduce_vars/defun_reference/output.js
index ced459561939..234b5b6082f9 100644
--- a/crates/swc_ecma_minifier/tests/terser/compress/reduce_vars/defun_reference/output.js
+++ b/crates/swc_ecma_minifier/tests/terser/compress/reduce_vars/defun_reference/output.js
@@ -3,10 +3,7 @@ function f() {
         x();
         return a;
     }
-    var a = function() {
-        y();
-        return 2;
-    }();
+    var a = (y(), 2);
     var b = 2;
     return a + 2;
 }
diff --git a/crates/swc_ecma_minifier/tests/terser/compress/reduce_vars/iife_assign/output.js b/crates/swc_ecma_minifier/tests/terser/compress/reduce_vars/iife_assign/output.js
index 96b2b6a0dd1b..296d5492b003 100644
--- a/crates/swc_ecma_minifier/tests/terser/compress/reduce_vars/iife_assign/output.js
+++ b/crates/swc_ecma_minifier/tests/terser/compress/reduce_vars/iife_assign/output.js
@@ -1,10 +1 @@
-!(function () {
-    var a = 1,
-        b = 0;
-    !(function () {
-        b++;
-        return;
-        a = 2;
-    })();
-    console.log(a);
-})();
+console.log(1);
diff --git a/crates/swc_ecma_minifier/tests/terser/compress/reduce_vars/immutable/output.js b/crates/swc_ecma_minifier/tests/terser/compress/reduce_vars/immutable/output.js
index 6cf85793521d..86cac6b94aa3 100644
--- a/crates/swc_ecma_minifier/tests/terser/compress/reduce_vars/immutable/output.js
+++ b/crates/swc_ecma_minifier/tests/terser/compress/reduce_vars/immutable/output.js
@@ -1,3 +1 @@
-!(function () {
-    console.log("test".indexOf("e"));
-})();
+console.log("test".indexOf("e"));
diff --git a/crates/swc_ecma_minifier/tests/terser/compress/reduce_vars/inner_var_for_in_1/output.js b/crates/swc_ecma_minifier/tests/terser/compress/reduce_vars/inner_var_for_in_1/output.js
index 531609c6dea5..3954b13c27a0 100644
--- a/crates/swc_ecma_minifier/tests/terser/compress/reduce_vars/inner_var_for_in_1/output.js
+++ b/crates/swc_ecma_minifier/tests/terser/compress/reduce_vars/inner_var_for_in_1/output.js
@@ -1,11 +1,7 @@
 function f() {
-    var a = 1,
-        b = 2;
-    for (b in (function () {
-        return x(1, b, c);
-    })()) {
-        var c = 3,
-            d = 4;
+    var a = 1, b = 2;
+    for(b in x(1, b, c)){
+        var c = 3, d = 4;
         x(1, b, c, d);
     }
     x(1, b, c, d);
diff --git a/crates/swc_ecma_minifier/tests/terser/compress/reduce_vars/issue_1595_2/output.js b/crates/swc_ecma_minifier/tests/terser/compress/reduce_vars/issue_1595_2/output.js
index 74462d6b35c8..4c14ab0a4ab0 100644
--- a/crates/swc_ecma_minifier/tests/terser/compress/reduce_vars/issue_1595_2/output.js
+++ b/crates/swc_ecma_minifier/tests/terser/compress/reduce_vars/issue_1595_2/output.js
@@ -1,3 +1 @@
-(function(a) {
-    return g(3);
-})(0);
+g(3);
diff --git a/crates/swc_ecma_minifier/tests/terser/compress/reduce_vars/issue_1595_3/output.js b/crates/swc_ecma_minifier/tests/terser/compress/reduce_vars/issue_1595_3/output.js
index c44c43c1d31a..4c14ab0a4ab0 100644
--- a/crates/swc_ecma_minifier/tests/terser/compress/reduce_vars/issue_1595_3/output.js
+++ b/crates/swc_ecma_minifier/tests/terser/compress/reduce_vars/issue_1595_3/output.js
@@ -1,3 +1 @@
-(function (a) {
-    return g(3);
-})();
+g(3);
diff --git a/crates/swc_ecma_minifier/tests/terser/compress/reduce_vars/issue_1670_1/output.js b/crates/swc_ecma_minifier/tests/terser/compress/reduce_vars/issue_1670_1/output.js
index 8385afee60ed..5669eec47340 100644
--- a/crates/swc_ecma_minifier/tests/terser/compress/reduce_vars/issue_1670_1/output.js
+++ b/crates/swc_ecma_minifier/tests/terser/compress/reduce_vars/issue_1670_1/output.js
@@ -1,4 +1 @@
-(function () {
-    var a;
-    void 0 === a ? console.log("PASS") : console.log("FAIL");
-})();
+console.log("PASS");
diff --git a/crates/swc_ecma_minifier/tests/terser/compress/reduce_vars/issue_1670_2/output.js b/crates/swc_ecma_minifier/tests/terser/compress/reduce_vars/issue_1670_2/output.js
index 1d10f61fe231..5669eec47340 100644
--- a/crates/swc_ecma_minifier/tests/terser/compress/reduce_vars/issue_1670_2/output.js
+++ b/crates/swc_ecma_minifier/tests/terser/compress/reduce_vars/issue_1670_2/output.js
@@ -1,3 +1 @@
-(function () {
-    console.log("PASS");
-})();
+console.log("PASS");
diff --git a/crates/swc_ecma_minifier/tests/terser/compress/reduce_vars/issue_1670_3/output.js b/crates/swc_ecma_minifier/tests/terser/compress/reduce_vars/issue_1670_3/output.js
index 8385afee60ed..5669eec47340 100644
--- a/crates/swc_ecma_minifier/tests/terser/compress/reduce_vars/issue_1670_3/output.js
+++ b/crates/swc_ecma_minifier/tests/terser/compress/reduce_vars/issue_1670_3/output.js
@@ -1,4 +1 @@
-(function () {
-    var a;
-    void 0 === a ? console.log("PASS") : console.log("FAIL");
-})();
+console.log("PASS");
diff --git a/crates/swc_ecma_minifier/tests/terser/compress/reduce_vars/issue_1670_4/output.js b/crates/swc_ecma_minifier/tests/terser/compress/reduce_vars/issue_1670_4/output.js
index 1d10f61fe231..5669eec47340 100644
--- a/crates/swc_ecma_minifier/tests/terser/compress/reduce_vars/issue_1670_4/output.js
+++ b/crates/swc_ecma_minifier/tests/terser/compress/reduce_vars/issue_1670_4/output.js
@@ -1,3 +1 @@
-(function () {
-    console.log("PASS");
-})();
+console.log("PASS");
diff --git a/crates/swc_ecma_minifier/tests/terser/compress/reduce_vars/issue_1670_5/output.js b/crates/swc_ecma_minifier/tests/terser/compress/reduce_vars/issue_1670_5/output.js
index 17a626e090fb..296d5492b003 100644
--- a/crates/swc_ecma_minifier/tests/terser/compress/reduce_vars/issue_1670_5/output.js
+++ b/crates/swc_ecma_minifier/tests/terser/compress/reduce_vars/issue_1670_5/output.js
@@ -1,3 +1 @@
-(function () {
-    console.log(1);
-})();
+console.log(1);
diff --git a/crates/swc_ecma_minifier/tests/terser/compress/reduce_vars/issue_1814_1/output.js b/crates/swc_ecma_minifier/tests/terser/compress/reduce_vars/issue_1814_1/output.js
index 6bf7793cafb0..3f684501d414 100644
--- a/crates/swc_ecma_minifier/tests/terser/compress/reduce_vars/issue_1814_1/output.js
+++ b/crates/swc_ecma_minifier/tests/terser/compress/reduce_vars/issue_1814_1/output.js
@@ -1,6 +1,5 @@
 const a = 42;
 !function() {
-    !function(a) {
-        console.log(a++, 42);
-    }(0);
+    var a;
+    a = 0, console.log(a++, 42);
 }();
diff --git a/crates/swc_ecma_minifier/tests/terser/compress/reduce_vars/issue_1814_2/output.js b/crates/swc_ecma_minifier/tests/terser/compress/reduce_vars/issue_1814_2/output.js
index 0743f91fda70..a2756e48d5f1 100644
--- a/crates/swc_ecma_minifier/tests/terser/compress/reduce_vars/issue_1814_2/output.js
+++ b/crates/swc_ecma_minifier/tests/terser/compress/reduce_vars/issue_1814_2/output.js
@@ -1,6 +1,5 @@
 const a = "32";
 !function() {
-    !function(a) {
-        console.log("321", a++);
-    }(0);
+    var a;
+    a = 0, console.log("321", a++);
 }();
diff --git a/crates/swc_ecma_minifier/tests/terser/compress/reduce_vars/lvalues_def_2/output.js b/crates/swc_ecma_minifier/tests/terser/compress/reduce_vars/lvalues_def_2/output.js
index c9757f3de3fc..42a40d68d719 100644
--- a/crates/swc_ecma_minifier/tests/terser/compress/reduce_vars/lvalues_def_2/output.js
+++ b/crates/swc_ecma_minifier/tests/terser/compress/reduce_vars/lvalues_def_2/output.js
@@ -1,3 +1,3 @@
-var b = 1;
-var a = b += 1, b = NaN;
+var b;
+var a = b = 2, b = NaN;
 console.log(a, b);
diff --git a/crates/swc_ecma_minifier/tests/terser/compress/reduce_vars/toplevel_on_loops_1/output.js b/crates/swc_ecma_minifier/tests/terser/compress/reduce_vars/toplevel_on_loops_1/output.js
index 23806c824580..3efbb16ddd20 100644
--- a/crates/swc_ecma_minifier/tests/terser/compress/reduce_vars/toplevel_on_loops_1/output.js
+++ b/crates/swc_ecma_minifier/tests/terser/compress/reduce_vars/toplevel_on_loops_1/output.js
@@ -1,5 +1,3 @@
 var x = 3;
-do (function() {
-    console.log("bar:", --x);
-})();
+do console.log("bar:", --x);
 while (x)
diff --git a/crates/swc_ecma_minifier/tests/terser/compress/reduce_vars/toplevel_on_loops_2/output.js b/crates/swc_ecma_minifier/tests/terser/compress/reduce_vars/toplevel_on_loops_2/output.js
index 82d1caa8657a..1e52ba580cd0 100644
--- a/crates/swc_ecma_minifier/tests/terser/compress/reduce_vars/toplevel_on_loops_2/output.js
+++ b/crates/swc_ecma_minifier/tests/terser/compress/reduce_vars/toplevel_on_loops_2/output.js
@@ -1,3 +1 @@
-for(;;)(function() {
-    console.log("bar:");
-})();
+for(;;)console.log("bar:");
diff --git a/crates/swc_ecma_minifier/tests/terser/compress/reduce_vars/var_assign_1/output.js b/crates/swc_ecma_minifier/tests/terser/compress/reduce_vars/var_assign_1/output.js
index 80cde5a86f24..e00b68aa31ad 100644
--- a/crates/swc_ecma_minifier/tests/terser/compress/reduce_vars/var_assign_1/output.js
+++ b/crates/swc_ecma_minifier/tests/terser/compress/reduce_vars/var_assign_1/output.js
@@ -1,3 +1 @@
-!(function () {
-    console.log(2);
-})();
+console.log(2);
diff --git a/crates/swc_ecma_minifier/tests/terser/compress/reduce_vars/var_assign_2/output.js b/crates/swc_ecma_minifier/tests/terser/compress/reduce_vars/var_assign_2/output.js
index 6aa4f3429c94..e00b68aa31ad 100644
--- a/crates/swc_ecma_minifier/tests/terser/compress/reduce_vars/var_assign_2/output.js
+++ b/crates/swc_ecma_minifier/tests/terser/compress/reduce_vars/var_assign_2/output.js
@@ -1,3 +1 @@
-!function() {
-    console.log(2);
-}();
+console.log(2);
diff --git a/crates/swc_ecma_minifier/tests/terser/compress/reduce_vars/var_assign_5/output.js b/crates/swc_ecma_minifier/tests/terser/compress/reduce_vars/var_assign_5/output.js
index b6a1c4996a6b..3150c743eeaa 100644
--- a/crates/swc_ecma_minifier/tests/terser/compress/reduce_vars/var_assign_5/output.js
+++ b/crates/swc_ecma_minifier/tests/terser/compress/reduce_vars/var_assign_5/output.js
@@ -1,6 +1,5 @@
 !function() {
     var a;
-    !function(b) {
-        console.log(a = 2, b);
-    }(a);
+    var b;
+    b = a, console.log(a = 2, b);
 }();
diff --git a/crates/swc_ecma_minifier/tests/terser/compress/reduce_vars/var_assign_6/output.js b/crates/swc_ecma_minifier/tests/terser/compress/reduce_vars/var_assign_6/output.js
index 46c2da7be8b1..653cbc482c32 100644
--- a/crates/swc_ecma_minifier/tests/terser/compress/reduce_vars/var_assign_6/output.js
+++ b/crates/swc_ecma_minifier/tests/terser/compress/reduce_vars/var_assign_6/output.js
@@ -1,4 +1,4 @@
-!(function () {
-    var a = (function () {})((a = 1));
+!function() {
+    var a = void (a = 1);
     console.log(a);
-})();
+}();