feat(es): Use minify.format.ascii_only if output.charset is not specified (#7258)

**Related issue:** - Closes #7240.

Author: kdy1

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 },
  })
  }
 }

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
+}

crates/swc/tests/fixture/issues-7xxx/7240/input/index.js

@@ -0,0 +1,5 @@
+export default {
+ \u3131: '\u11B0',
+ '\u3141': '\u11B1',
+ ['\u3142']: '\u11B2',
+}

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);