feat(es/minifier): Improve compatibility of arrows with terser (#6862)

**Related issue:**

 - Closes #6123.

Author: kdy1

crates/swc_ecma_minifier/src/compress/pure/arrows.rs

@@ -41,10 +41,6 @@ impl Pure<'_> {
     }
 
     pub(super) fn optimize_arrow_body(&mut self, b: &mut BlockStmtOrExpr) {
-        if !self.options.arrows {
-            return;
-        }
-
         match b {
             BlockStmtOrExpr::BlockStmt(s) => {
                 if s.stmts.len() == 1 {

crates/swc_ecma_minifier/tests/fixture/issues/6730/output.js

@@ -1,6 +1,6 @@
-function n(n, e, t, r, o, u, i) {
+function n(n, e, t, r, o, i, u) {
     try {
-        var a = n[u](i);
+        var a = n[i](u);
         var c = a.value;
     } catch (n) {
         t(n);
@@ -12,20 +12,19 @@ function n(n, e, t, r, o, u, i) {
 function e(e) {
     return function() {
         var t = this, r = arguments;
-        return new Promise(function(o, u) {
-            var i = e.apply(t, r);
+        return new Promise(function(o, i) {
+            var u = e.apply(t, r);
             function a(e) {
-                n(i, o, u, a, c, "next", e);
+                n(u, o, i, a, c, "next", e);
             }
             function c(e) {
-                n(i, o, u, a, c, "throw", e);
+                n(u, o, i, a, c, "throw", e);
             }
             a(void 0);
         });
     };
 }
-export const styleLoader = ()=>{
-    return {
+export const styleLoader = ()=>({
         name: 'style-loader',
         setup (n) {
             n.onLoad({
@@ -38,5 +37,4 @@ export const styleLoader = ()=>{
                 };
             }());
         }
-    };
-};
+    });

crates/swc_ecma_minifier/tests/pass-1/issue-6123/1/config.json

@@ -0,0 +1,6 @@
+{
+    "defaults": false,
+    "conditionals": true,
+    "dead_code": true,
+    "arrows": false
+}

crates/swc_ecma_minifier/tests/pass-1/issue-6123/1/input.js

@@ -0,0 +1,12 @@
+const arrow = (param) => {
+    return Boolean(param);
+}
+
+const obj = {
+    method1() {
+        return "hello";
+    },
+    method2() {
+        return "goodbye"
+    }
+}

crates/swc_ecma_minifier/tests/pass-1/issue-6123/1/output.js

@@ -0,0 +1,9 @@
+const arrow = (param)=>Boolean(param);
+const obj = {
+    method1 () {
+        return "hello";
+    },
+    method2 () {
+        return "goodbye";
+    }
+};