diff --git a/packages/babel-core/src/config/files/module-types.ts b/packages/babel-core/src/config/files/module-types.ts
index 909ac44637d8..d9a43822eba7 100644
--- a/packages/babel-core/src/config/files/module-types.ts
+++ b/packages/babel-core/src/config/files/module-types.ts
@@ -74,6 +74,7 @@ function loadCtsDefault(filepath: string) {
           {
             allowDeclareFields: true,
             disallowAmbiguousJSXLike: true,
+            allExtensions: true,
             onlyRemoveTypeImports: true,
             optimizeConstEnums: true,
           },