From 8ecaa40c6e7c9936476b22e994947982a40e0b50 Mon Sep 17 00:00:00 2001
From: "Alex Lam S.L" <alexlamsl@gmail.com>
Date: Mon, 19 Oct 2020 02:34:17 +0100
Subject: extend support for Unicode (#4228)

---
 lib/output.js | 3 +++
 1 file changed, 3 insertions(+)

(limited to 'lib/output.js')

diff --git a/lib/output.js b/lib/output.js
index 8068648e..ef1d41f6 100644
--- a/lib/output.js
+++ b/lib/output.js
@@ -107,6 +107,9 @@ function OutputStream(options) {
     var OUTPUT = "";
 
     var to_utf8 = options.ascii_only ? function(str, identifier) {
+        if (identifier) str = str.replace(/[\ud800-\udbff][\udc00-\udfff]/g, function(ch) {
+            return "\\u{" + (ch.charCodeAt(0) - 0xd7c0 << 10 | ch.charCodeAt(1) - 0xdc00).toString(16) + "}";
+        });
         return str.replace(/[\u0000-\u001f\u007f-\uffff]/g, function(ch) {
             var code = ch.charCodeAt(0).toString(16);
             if (code.length <= 2 && !identifier) {
-- 
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