Support case variants for insensitive lexical sort

package.json

@@ -1,6 +1,6 @@
 {
   "name": "prettier-plugin-sort-json",
-  "version": "3.1.0",
+  "version": "3.1.1",
   "description": "Prettier plugin to sort JSON files alphanumerically by key",
   "repository": {
     "type": "git",

src/index.test.ts

@@ -727,6 +727,58 @@ test('should sort an unsorted JSON object with a complex custom sort', async (t)
   t.snapshot(output);
 });
 
+test('should sort an unsorted JSON object with complex case sensitivies, preferring determinsistic order', async (t) => {
+  const fixture = {
+    c: 6,
+    a: 2,
+    C: 5,
+    B: 3,
+    b: 4,
+    A: 1,
+  };
+
+  const input = JSON.stringify(fixture, null, 2);
+  const output = await format(input, {
+    filepath: 'foo.json',
+    parser: 'json',
+    plugins: [SortJsonPlugin],
+    ...{
+      jsonSortOrder: JSON.stringify({
+        '/(.+)/': 'caseInsensitiveLexical',
+      }),
+    },
+  });
+
+  t.snapshot(output);
+});
+
+test('should sort an unsorted JSON object with complex case sensitivies, preferring original sort order', async (t) => {
+  const fixture = {
+    c: 6,
+    a: 2,
+    C: 5,
+    B: 3,
+    b: 4,
+    A: 1,
+  };
+
+  const input = JSON.stringify(fixture, null, 2);
+  const output = await format(input, {
+    filepath: 'foo.json',
+    parser: 'json',
+    plugins: [SortJsonPlugin],
+    ...{
+      jsonSortOrder: JSON.stringify({
+        '/^[Aa]/': 'none',
+        '/^[Bb]/': 'none',
+        '/^[Cc]/': 'none',
+      }),
+    },
+  });
+
+  t.snapshot(output);
+});
+
 test('should validate a sorted JSON object with the none order', async (t) => {
   const fixture = {
     a: 1,

src/index.test.ts.md

@@ -492,6 +492,34 @@ Generated by [AVA](https://avajs.dev).
     }␊
     `
 
+## should sort an unsorted JSON object with complex case sensitivies, preferring determinsistic order
+
+> Snapshot 1
+
+    `{␊
+      "A": 1,␊
+      "a": 2,␊
+      "B": 3,␊
+      "b": 4,␊
+      "C": 5,␊
+      "c": 6␊
+    }␊
+    `
+
+## should sort an unsorted JSON object with complex case sensitivies, preferring original sort order
+
+> Snapshot 1
+
+    `{␊
+      "a": 2,␊
+      "A": 1,␊
+      "B": 3,␊
+      "b": 4,␊
+      "c": 6,␊
+      "C": 5␊
+    }␊
+    `
+
 ## should validate a sorted JSON object with the none order
 
 > Snapshot 1

src/index.ts

@@ -19,7 +19,13 @@ import { parsers as babelParsers } from 'prettier/plugins/babel';
  * @returns A number indicating which element should come first.
  */
 function lexicalSort(a: string, b: string) {
-  return a > b ? 1 : -1;
+  if (a > b) {
+    return 1;
+  }
+  if (a < b) {
+    return -1;
+  }
+  return 0;
 }
 
 const integerPrefixRegex = /^(\d+)/u;
@@ -78,7 +84,7 @@ function reverseSort(sortFunction: (a: string, b: string) => number) {
  */
 function caseInsensitiveSort(sortFunction: (a: string, b: string) => number) {
   return (a: string, b: string) => {
-    return sortFunction(a.toLowerCase(), b.toLowerCase());
+    return sortFunction(a.toLowerCase(), b.toLowerCase()) || sortFunction(a, b);
   };
 }