fix: bug for useCaseSensitiveFileNames (#11)

* fix: bug for useCaseSensitiveFileNames

* Create great-apples-whisper.md

Author: ota-meshi

Diff for: .changeset/great-apples-whisper.md

@@ -0,0 +1,5 @@
+---
+"typescript-eslint-parser-for-extra-files": patch
+---
+
+fix: bug for useCaseSensitiveFileNames

Diff for: src/ts.ts

@@ -363,8 +363,8 @@ function distinctArray(...list: (string | null | undefined)[]) {
   return [
     ...new Set(
       ts.sys.useCaseSensitiveFileNames
-        ? list.map((s) => s?.toLowerCase())
-        : list
+        ? list
+        : list.map((s) => s?.toLowerCase())
     ),
   ].filter((s): s is string => s != null);
 }