From af348d723586bc06f93a510d30154bd484052165 Mon Sep 17 00:00:00 2001
From: Jos de Jong <wjosdejong@gmail.com>
Date: Tue, 13 Jun 2023 12:06:57 +0200
Subject: [PATCH] fix: #93 repair `undefined` values by replacing them with
 `null`

---
 src/jsonrepair.test.ts | 6 ++++++
 src/jsonrepair.ts      | 2 +-
 2 files changed, 7 insertions(+), 1 deletion(-)

diff --git a/src/jsonrepair.test.ts b/src/jsonrepair.test.ts
index 6d87b83..ecc04fd 100644
--- a/src/jsonrepair.test.ts
+++ b/src/jsonrepair.test.ts
@@ -146,6 +146,12 @@ describe('jsonRepair', () => {
       strictEqual(jsonrepair('{"a":'), '{"a":null}')
     })
 
+    it('should repair undefined values', () => {
+      strictEqual(jsonrepair('{"a":undefined}'), '{"a":null}')
+      strictEqual(jsonrepair('[undefined]'), '[null]')
+      strictEqual(jsonrepair('undefined'), 'null')
+    })
+
     it('should escape unescaped control characters', () => {
       strictEqual(jsonrepair('"hello\bworld"'), '"hello\\bworld"')
       strictEqual(jsonrepair('"hello\fworld"'), '"hello\\fworld"')
diff --git a/src/jsonrepair.ts b/src/jsonrepair.ts
index b0864d9..cd7f78d 100644
--- a/src/jsonrepair.ts
+++ b/src/jsonrepair.ts
@@ -596,7 +596,7 @@ export function jsonrepair(text: string): string {
         }
 
         const symbol = text.slice(start, i)
-        output += JSON.stringify(symbol)
+        output += symbol === 'undefined' ? 'null' : JSON.stringify(symbol)
 
         return true
       }