From 439ae641aa5232b69d340901e23f2ee1a2d478b0 Mon Sep 17 00:00:00 2001
From: francesco <francesco.bagnoli.69@gmail.com>
Date: Mon, 22 Sep 2025 17:06:19 +0200
Subject: [PATCH 1/2] perf: simple asString

close #786

Signed-off-by: francesco <francesco.bagnoli.69@gmail.com>
---
 lib/serializer.js | 29 +----------------------------
 1 file changed, 1 insertion(+), 28 deletions(-)

diff --git a/lib/serializer.js b/lib/serializer.js
index d92a4e32..320f36b1 100644
--- a/lib/serializer.js
+++ b/lib/serializer.js
@@ -88,34 +88,7 @@ module.exports = class Serializer {
   }
 
   asString (str) {
-    const len = str.length
-    if (len < 42) {
-      // magically escape strings for json
-      // relying on their charCodeAt
-      // everything below 32 needs JSON.stringify()
-      // every string that contain surrogate needs JSON.stringify()
-      // 34 and 92 happens all the time, so we
-      // have a fast case for them
-      let result = ''
-      let last = -1
-      let point = 255
-      for (let i = 0; i < len; i++) {
-        point = str.charCodeAt(i)
-        if (
-          point === 0x22 || // '"'
-          point === 0x5c // '\'
-        ) {
-          last === -1 && (last = 0)
-          result += str.slice(last, i) + '\\'
-          last = i
-        } else if (point < 32 || (point >= 0xD800 && point <= 0xDFFF)) {
-          // The current character is non-printable characters or a surrogate.
-          return JSON.stringify(str)
-        }
-      }
-      return (last === -1 && ('"' + str + '"')) || ('"' + result + str.slice(last) + '"')
-    } else if (len < 5000 && str.isWellFormed()) {
-      // Only use the regular expression for shorter input. The overhead is otherwise too much.
+    if (str.isWellFormed()) {
       return '"' + str + '"'
     } else {
       return JSON.stringify(str)

From 2a2e4e4f51edba080adfc14646c67bb0b58c7fba Mon Sep 17 00:00:00 2001
From: francesco <francesco.bagnoli.69@gmail.com>
Date: Mon, 22 Sep 2025 17:11:15 +0200
Subject: [PATCH 2/2] fix: isWellFormed

Signed-off-by: francesco <francesco.bagnoli.69@gmail.com>
---
 lib/serializer.js | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/lib/serializer.js b/lib/serializer.js
index 320f36b1..31319ea4 100644
--- a/lib/serializer.js
+++ b/lib/serializer.js
@@ -1,5 +1,7 @@
 'use strict'
 
+const findEscapeSequence = /["\b\t\n\v\f\r\/]/
+
 module.exports = class Serializer {
   constructor (options) {
     switch (options && options.rounding) {
@@ -88,10 +90,10 @@ module.exports = class Serializer {
   }
 
   asString (str) {
-    if (str.isWellFormed()) {
-      return '"' + str + '"'
-    } else {
+    if (findEscapeSequence.test(str)) {
       return JSON.stringify(str)
+    } else {
+      return '"' + str + '"'
     }
   }