Try finding the leak

packages/cspell-lib/package.json

@@ -93,6 +93,7 @@
     "@cspell/dict-python": "^4.1.11",
     "@types/configstore": "^6.0.2",
     "cspell-dict-nl-nl": "^1.1.2",
+    "leaked-handles": "^5.2.0",
     "lorem-ipsum": "^2.0.8"
   }
 }

packages/cspell-lib/src/lib/leaked-handles.d.ts

@@ -0,0 +1,10 @@
+declare module 'leaked-handles' {
+    export interface Options {
+        timeout?: number;
+        fullStack?: boolean;
+        debugErrors?: boolean;
+        debugSockets?: boolean;
+    }
+
+    export function set(opts: Options);
+}

packages/cspell-lib/src/lib/util/resolveFile.test.ts

@@ -2,6 +2,7 @@ import { parse } from 'comment-json';
 import type { VFileSystemProvider } from 'cspell-io';
 import { createRedirectProvider, createVirtualFS } from 'cspell-io';
 import * as fs from 'fs';
+import leakedHandles from 'leaked-handles';
 import * as os from 'os';
 import * as path from 'path';
 import { fileURLToPath, pathToFileURL } from 'url';
@@ -35,6 +36,8 @@ const rr = {
 const oc = expect.objectContaining;
 const sm = expect.stringMatching;
 
+leakedHandles.set({ fullStack: true });
+
 describe('Validate resolveFile', () => {
     const redirects: [VFileSystemProvider, ...VFileSystemProvider[]] = [
         createRedirectProvider('google', new URL('https://google.com/'), notFoundURL),