From e5252cc1dc8c00b0ab73d85bec028d2c5f0fa761 Mon Sep 17 00:00:00 2001
From: Nikaple <nikaple1@gmail.com>
Date: Mon, 23 Oct 2023 17:06:39 +0800
Subject: [PATCH] fix: object keys which starts with a number

---
 src/flatten.test.ts  | 2 ++
 src/flatten.ts       | 2 +-
 src/internal.test.ts | 5 +++++
 3 files changed, 8 insertions(+), 1 deletion(-)

diff --git a/src/flatten.test.ts b/src/flatten.test.ts
index 4972813..09e5d06 100644
--- a/src/flatten.test.ts
+++ b/src/flatten.test.ts
@@ -19,6 +19,7 @@ describe('flattenObject', () => {
         a: {
           b: {
             c: 123,
+            '2c': 456,
           },
           d: [
             {
@@ -29,6 +30,7 @@ describe('flattenObject', () => {
       },
       {
         'a.b.c': 123,
+        'a.b["2c"]': 456,
         'a.d[0].e': 456,
       },
     );
diff --git a/src/flatten.ts b/src/flatten.ts
index 421099a..ed70029 100644
--- a/src/flatten.ts
+++ b/src/flatten.ts
@@ -26,7 +26,7 @@ export const flatten = <T>(
   const getKey = (key: string, prefix: string, isNumber: boolean) => {
     let k;
     if (
-      /[.'"\s\\\b\f\n\r\t\v{}()[\];,<>=!+\-*%&|^~?:]/.test(key) ||
+      /[.'"\s\\\b\f\n\r\t\v{}()[\];,<>=!+\-*%&|^~?:]|^\d+\D/.test(key) ||
       key === ''
     ) {
       // use brackets if key contains special characters
diff --git a/src/internal.test.ts b/src/internal.test.ts
index 92b95df..0973cbe 100644
--- a/src/internal.test.ts
+++ b/src/internal.test.ts
@@ -7,6 +7,11 @@ describe('parsePath', () => {
     expect(result).toEqual(['foo', 'bar', 1, 'baz', 'qux']);
   });
 
+  it('should parse string starts with number', () => {
+    const result = parsePath('foo.1bc');
+    expect(result).toEqual(['foo', '1bc']);
+  });
+
   it('should parse escaped quotes correctly', () => {
     const result = parsePath('foo["bar\\"baz"]');
     expect(result).toEqual(['foo', 'bar"baz']);