fix(es/codegen): Wrap quote for length greater than one (#8351)

Author: bvanjoi

crates/swc_ecma_codegen/src/lib.rs

@@ -3820,7 +3820,7 @@ fn get_ascii_only_ident(sym: &str, target: EsVersion) -> Cow<str> {
                         let h = ((c as u32 - 0x10000) / 0x400) + 0xd800;
                         let l = (c as u32 - 0x10000) % 0x400 + 0xdc00;
 
-                        let _ = write!(buf, "\\u{:04X}\\u{:04X}", h, l);
+                        let _ = write!(buf, r#""\u{:04X}\u{:04X}""#, h, l);
                     } else {
                         let _ = write!(buf, "\\u{{{:04X}}}", c as u32);
                     }

crates/swc_ecma_minifier/tests/format.rs

@@ -82,3 +82,25 @@ console.log("</sCrIpT>");
         Config::default().with_inline_script(true).with_minify(true),
     )
 }
+
+#[test]
+fn rspack_issue_4797() {
+    let src = r#"
+obj = {
+    𝒩: "a",
+    "𝒩": "a",
+    𝒩: "𝒩"
+}
+"#;
+    assert_format(
+        src,
+        r#"obj = {
+    "\uD835\uDCA9": "a",
+    "\uD835\uDCA9": "a",
+    "\uD835\uDCA9": "\uD835\uDCA9"
+};"#,
+        Config::default()
+            .with_ascii_only(true)
+            .with_target(EsVersion::Es5),
+    )
+}