diff --git a/packages/tsconfig-utils/tests/lib/getParsedConfigFile.test.ts b/packages/tsconfig-utils/tests/getParsedConfigFile.test.ts
similarity index 88%
rename from packages/tsconfig-utils/tests/lib/getParsedConfigFile.test.ts
rename to packages/tsconfig-utils/tests/getParsedConfigFile.test.ts
index d26919b52b5c..661c84dcb6b0 100644
--- a/packages/tsconfig-utils/tests/lib/getParsedConfigFile.test.ts
+++ b/packages/tsconfig-utils/tests/getParsedConfigFile.test.ts
@@ -1,7 +1,7 @@
-import path from 'node:path';
+import * as path from 'node:path';
 import * as ts from 'typescript';
 
-import { getParsedConfigFile } from '../../src/getParsedConfigFile';
+import { getParsedConfigFile } from '../src/getParsedConfigFile.js';
 
 const mockGetParsedCommandLineOfConfigFile = vi.fn();
 
@@ -22,9 +22,9 @@ describe(getParsedConfigFile, () => {
   });
 
   it('throws an error when tsserver.sys is undefined', () => {
-    expect(() =>
-      getParsedConfigFile({} as typeof ts, './tsconfig.json'),
-    ).toThrow(
+    expect(() => {
+      getParsedConfigFile({} as typeof ts, './tsconfig.json');
+    }).toThrow(
       '`getParsedConfigFile` is only supported in a Node-like environment.',
     );
   });
@@ -72,9 +72,9 @@ describe(getParsedConfigFile, () => {
         },
       ] satisfies ts.Diagnostic[],
     });
-    expect(() => getParsedConfigFile(mockTsserver, './tsconfig.json')).toThrow(
-      /.+ error TS1234: Oh no!/,
-    );
+    expect(() => {
+      getParsedConfigFile(mockTsserver, './tsconfig.json');
+    }).toThrow(/.+ error TS1234: Oh no!/);
   });
 
   it('throws a diagnostic error when getParsedCommandLineOfConfigFile throws an error', () => {
@@ -96,9 +96,9 @@ describe(getParsedConfigFile, () => {
         } satisfies ts.Diagnostic);
       },
     );
-    expect(() => getParsedConfigFile(mockTsserver, './tsconfig.json')).toThrow(
-      /.+ error TS1234: Oh no!/,
-    );
+    expect(() => {
+      getParsedConfigFile(mockTsserver, './tsconfig.json');
+    }).toThrow(/.+ error TS1234: Oh no!/);
   });
 
   it('uses compiler options when parsing a config file succeeds', () => {
diff --git a/packages/tsconfig-utils/tsconfig.build.json b/packages/tsconfig-utils/tsconfig.build.json
index 2250b25126e4..4a1f19accacd 100644
--- a/packages/tsconfig-utils/tsconfig.build.json
+++ b/packages/tsconfig-utils/tsconfig.build.json
@@ -1,14 +1,5 @@
 {
-  "extends": "../../tsconfig.base.json",
-  "compilerOptions": {
-    "baseUrl": ".",
-    "rootDir": "src",
-    "outDir": "dist",
-    "tsBuildInfoFile": "dist/tsconfig.build.tsbuildinfo",
-    "emitDeclarationOnly": false,
-    "types": ["node"]
-  },
-  "include": ["src/**/*.ts", "typings"],
-  "exclude": ["vitest.config.mts", "src/**/*.spec.ts", "src/**/*.test.ts"],
+  "extends": "../../tsconfig.build.json",
+  "compilerOptions": {},
   "references": []
 }
diff --git a/packages/tsconfig-utils/tsconfig.spec.json b/packages/tsconfig-utils/tsconfig.spec.json
index 21fcf7e24f3f..29124fc697d3 100644
--- a/packages/tsconfig-utils/tsconfig.spec.json
+++ b/packages/tsconfig-utils/tsconfig.spec.json
@@ -1,20 +1,8 @@
 {
   "extends": "../../tsconfig.base.json",
   "compilerOptions": {
-    "outDir": "../../dist/out-tsc/packages/tsconfig-utils",
-    "module": "NodeNext",
-    "resolveJsonModule": true,
-    "types": ["node", "vitest/globals", "vitest/importMeta"]
+    "outDir": "../../dist/packages/tsconfig-utils"
   },
-  "include": [
-    "vitest.config.mts",
-    "package.json",
-    "src/**/*.test.ts",
-    "src/**/*.spec.ts",
-    "src/**/*.d.ts",
-    "tests"
-  ],
-  "exclude": ["**/fixtures/**"],
   "references": [
     {
       "path": "./tsconfig.build.json"
diff --git a/packages/tsconfig-utils/vitest.config.mts b/packages/tsconfig-utils/vitest.config.mts
index 9cadb9dea2bb..ddc038f86b56 100644
--- a/packages/tsconfig-utils/vitest.config.mts
+++ b/packages/tsconfig-utils/vitest.config.mts
@@ -11,14 +11,9 @@ const vitestConfig = mergeConfig(
     root: import.meta.dirname,
 
     test: {
-      diff: {
-        maxDepth: 1,
-      },
-
       dir: path.join(import.meta.dirname, 'tests'),
       name: packageJson.name.replace('@typescript-eslint/', ''),
       root: import.meta.dirname,
-      testTimeout: 10_000,
     },
   }),
 );

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