diff --git a/src/index.d.ts b/src/index.d.ts
new file mode 100644
index 0000000..d020cdf
--- /dev/null
+++ b/src/index.d.ts
@@ -0,0 +1,13 @@
+export declare class ValidationError {
+  readonly valueName: string;
+  readonly expectedTypes: ReadonlyArray<string>;
+  readonly value: unknown;
+  readonly nested: ReadonlyArray<ValidationError>;
+
+  constructor(
+    valueName: string,
+    value: unknown,
+    expectedTypes?: string | ReadonlyArray<string>,
+    nested?: ReadonlyArray<ValidationError>,
+  );
+}