From 1fe5c3a803daf247709ac51f8c637ba7e56181bc Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Donny/=EA=B0=95=EB=8F=99=EC=9C=A4?= <kdy1997.dev@gmail.com>
Date: Thu, 13 Apr 2023 15:58:43 +0900
Subject: [PATCH] feat(es): Use `minify.format.ascii_only` if `output.charset`
 is not specified (#7258)

**Related issue:**

 - Closes https://github.com/swc-project/swc/issues/7240.
---
 crates/swc/src/config/mod.rs                  | 10 +++++-
 .../fixture/issues-7xxx/7240/input/.swcrc     | 33 +++++++++++++++++++
 .../fixture/issues-7xxx/7240/input/index.js   |  5 +++
 .../fixture/issues-7xxx/7240/output/index.js  | 13 ++++++++
 4 files changed, 60 insertions(+), 1 deletion(-)
 create mode 100644 crates/swc/tests/fixture/issues-7xxx/7240/input/.swcrc
 create mode 100644 crates/swc/tests/fixture/issues-7xxx/7240/input/index.js
 create mode 100644 crates/swc/tests/fixture/issues-7xxx/7240/output/index.js

diff --git a/crates/swc/src/config/mod.rs b/crates/swc/src/config/mod.rs
index 9b1dbae148a4..81d56b6d1b33 100644
--- a/crates/swc/src/config/mod.rs
+++ b/crates/swc/src/config/mod.rs
@@ -577,6 +577,14 @@ impl Options {
             _ => TsImportExportAssignConfig::Classic,
         };
 
+        let charset = cfg.jsc.output.charset.or_else(|| {
+            if js_minify.as_ref()?.format.ascii_only {
+                Some(OutputCharset::Ascii)
+            } else {
+                None
+            }
+        });
+
         let pass = PassBuilder::new(
             cm,
             handler,
@@ -782,7 +790,7 @@ impl Options {
             comments: comments.cloned(),
             preserve_comments,
             emit_source_map_columns: cfg.emit_source_map_columns.into_bool(),
-            output: cfg.jsc.output,
+            output: JscOutputConfig { charset },
         })
     }
 }
diff --git a/crates/swc/tests/fixture/issues-7xxx/7240/input/.swcrc b/crates/swc/tests/fixture/issues-7xxx/7240/input/.swcrc
new file mode 100644
index 000000000000..0b9b2b894465
--- /dev/null
+++ b/crates/swc/tests/fixture/issues-7xxx/7240/input/.swcrc
@@ -0,0 +1,33 @@
+{
+    "jsc": {
+        "parser": {
+            "syntax": "ecmascript",
+            "jsx": false
+        },
+        "target": "es5",
+        "loose": true,
+        "minify": {
+            "compress": {
+                "dead_code": true,
+                "drop_console": true,
+                "drop_debugger": true,
+                "passes": 3
+            },
+            "format": {
+                "asciiOnly": true
+            },
+            "mangle": {
+                "toplevel": false,
+                "keep_classnames": false,
+                "keep_fnames": false,
+                "keep_private_props": false,
+                "ie8": false,
+                "safari10": false
+            }
+        }
+    },
+    "module": {
+        "type": "commonjs"
+    },
+    "isModule": true
+}
\ No newline at end of file
diff --git a/crates/swc/tests/fixture/issues-7xxx/7240/input/index.js b/crates/swc/tests/fixture/issues-7xxx/7240/input/index.js
new file mode 100644
index 000000000000..9f3bf303445e
--- /dev/null
+++ b/crates/swc/tests/fixture/issues-7xxx/7240/input/index.js
@@ -0,0 +1,5 @@
+export default {
+    \u3131: '\u11B0',
+    '\u3141': '\u11B1',
+    ['\u3142']: '\u11B2',
+}
diff --git a/crates/swc/tests/fixture/issues-7xxx/7240/output/index.js b/crates/swc/tests/fixture/issues-7xxx/7240/output/index.js
new file mode 100644
index 000000000000..240bd27309fd
--- /dev/null
+++ b/crates/swc/tests/fixture/issues-7xxx/7240/output/index.js
@@ -0,0 +1,13 @@
+"use strict";
+Object.defineProperty(exports, "__esModule", {
+    value: !0
+}), Object.defineProperty(exports, "default", {
+    enumerable: !0,
+    get: function() {
+        return _default;
+    }
+});
+var _obj, _default = ((_obj = {
+    \u3131: "\u11B0",
+    \u3141: "\u11B1"
+})["\u3142"] = "\u11B2", _obj);