diff --git a/source/index.ts b/source/index.ts
index f8c4e6f..ba578a4 100644
--- a/source/index.ts
+++ b/source/index.ts
@@ -4,6 +4,8 @@
 
 import {Class, TypedArray, ObservableLike, Primitive} from './types';
 
+export {Class, TypedArray, ObservableLike, Primitive};
+
 const typedArrayTypeNames = [
 	'Int8Array',
 	'Uint8Array',
diff --git a/source/types.ts b/source/types.ts
index dcae015..8bdd0f5 100644
--- a/source/types.ts
+++ b/source/types.ts
@@ -1,3 +1,5 @@
+// Extracted from https://github.com/sindresorhus/type-fest/blob/78019f42ea888b0cdceb41a4a78163868de57555/index.d.ts
+
 /**
 Matches any [primitive value](https://developer.mozilla.org/en-US/docs/Glossary/Primitive).
 */