fix(es/codegen): Preserve parens for new in optional chaining (#6484)

crates/swc/tests/fixture/issues-6xxx/6438/input/.swcrc

@@ -0,0 +1,72 @@
+{
+    "jsc": {
+        "parser": {
+            "syntax": "typescript",
+            "tsx": true
+        },
+        "transform": {
+            "react": {
+                "runtime": "automatic",
+                "importSource": "preact",
+                "development": true
+            }
+        },
+        "target": "es2022",
+        "loose": false,
+        "minify": {
+            "compress": {
+                "arguments": false,
+                "arrows": true,
+                "booleans": true,
+                "booleans_as_integers": false,
+                "collapse_vars": true,
+                "comparisons": true,
+                "computed_props": true,
+                "conditionals": true,
+                "dead_code": true,
+                "directives": true,
+                "drop_console": false,
+                "drop_debugger": true,
+                "evaluate": true,
+                "expression": false,
+                "hoist_funs": false,
+                "hoist_props": true,
+                "hoist_vars": false,
+                "if_return": true,
+                "join_vars": true,
+                "keep_classnames": false,
+                "keep_fargs": true,
+                "keep_fnames": false,
+                "keep_infinity": false,
+                "loops": true,
+                "negate_iife": true,
+                "properties": true,
+                "reduce_funcs": false,
+                "reduce_vars": false,
+                "side_effects": true,
+                "switches": true,
+                "typeofs": true,
+                "unsafe": false,
+                "unsafe_arrows": false,
+                "unsafe_comps": false,
+                "unsafe_Function": false,
+                "unsafe_math": false,
+                "unsafe_symbols": false,
+                "unsafe_methods": false,
+                "unsafe_proto": false,
+                "unsafe_regexp": false,
+                "unsafe_undefined": false,
+                "unused": true,
+                "const_to_let": true,
+                "pristine_globals": true,
+                "passes": 2
+            },
+            "mangle": false
+        }
+    },
+    "module": {
+        "type": "es6"
+    },
+    "minify": true,
+    "isModule": true
+}

crates/swc/tests/fixture/issues-6xxx/6438/input/index.js

@@ -0,0 +1 @@
+new Date()?.toLocaleDateString()

crates/swc/tests/fixture/issues-6xxx/6438/output/index.js

@@ -0,0 +1 @@
+new Date()?.toLocaleDateString();

crates/swc_ecma_codegen/src/lib.rs

@@ -810,7 +810,11 @@ where
 
         match n.base {
             OptChainBase::Member(ref e) => {
-                emit!(e.obj);
+                if let Expr::New(new) = &*e.obj {
+                    self.emit_new(new, false)?;
+                } else {
+                    emit!(e.obj);
+                }
                 punct!("?.");
 
                 match &e.prop {
@@ -820,11 +824,8 @@ where
                 }
             }
             OptChainBase::Call(ref e) => {
-                if let Expr::New(new) = &*e.callee {
-                    self.emit_new(new, false)?;
-                } else {
-                    emit!(e.callee);
-                }
+                debug_assert!(!e.callee.is_new());
+                emit!(e.callee);
                 punct!("?.");
 
                 punct!("(");