diff --git a/packages/type-utils/src/TypeOrValueSpecifier.ts b/packages/type-utils/src/TypeOrValueSpecifier.ts
index a926af02735e..091528c1b227 100644
--- a/packages/type-utils/src/TypeOrValueSpecifier.ts
+++ b/packages/type-utils/src/TypeOrValueSpecifier.ts
@@ -1,5 +1,5 @@
 import path from 'path';
-import type * as ts from 'typescript';
+import * as ts from 'typescript';
 
 interface FileSpecifier {
   from: 'file';
@@ -134,9 +134,23 @@ function typeDeclaredInFile(
 ): boolean {
   if (relativePath === undefined) {
     const cwd = program.getCurrentDirectory().toLowerCase();
-    return declarationFiles.some(declaration =>
-      declaration.fileName.toLowerCase().startsWith(cwd),
+    const typeRoots = ts.getEffectiveTypeRoots(
+      program.getCompilerOptions(),
+      program,
     );
+
+    return declarationFiles.some(declaration => {
+      if (program.isSourceFileFromExternalLibrary(declaration)) {
+        return false;
+      }
+      const fileName = declaration.fileName.toLowerCase();
+      if (!fileName.startsWith(cwd)) {
+        return false;
+      }
+      return (
+        typeRoots?.some(typeRoot => fileName.startsWith(typeRoot)) !== true
+      );
+    });
   }
   const absolutePath = path
     .join(program.getCurrentDirectory(), relativePath)
diff --git a/packages/type-utils/tests/TypeOrValueSpecifier.test.ts b/packages/type-utils/tests/TypeOrValueSpecifier.test.ts
index 4deefa9e96d1..a1a6bfc6fd04 100644
--- a/packages/type-utils/tests/TypeOrValueSpecifier.test.ts
+++ b/packages/type-utils/tests/TypeOrValueSpecifier.test.ts
@@ -210,6 +210,15 @@ describe('TypeOrValueSpecifier', () => {
             path: 'tests/fixtures/file.ts',
           },
         ]),
+        ['type RegExp = {prop: string};'].map(
+          (test): [string, TypeOrValueSpecifier] => [
+            test,
+            {
+              from: 'file',
+              name: 'RegExp',
+            },
+          ],
+        ),
       ].flat(),
     )('matches a matching file specifier: %s', runTestPositive);
 
@@ -234,6 +243,13 @@ describe('TypeOrValueSpecifier', () => {
           path: 'tests/fixtures/wrong-file.ts',
         },
       ],
+      [
+        'type Test = RegExp & {prop: string};',
+        {
+          from: 'file',
+          name: 'RegExp',
+        },
+      ],
     ])("doesn't match a mismatched file specifier: %s", runTestNegative);
 
     it.each<[string, TypeOrValueSpecifier]>([