feat: add typescript declarations

Author: dobesv

src/index.d.ts

@@ -0,0 +1,17 @@
+declare module 'react-optimize' {
+  import { ComponentType, ReactNode } from 'react';
+  interface ExperimentProps {
+    children: ReactNode;
+    id: string;
+    loader?: ReactNode;
+    timeout?: number;
+  }
+
+  const Experiment: ComponentType<ExperimentProps>;
+
+  interface VariantProps {
+    children: ReactNode;
+    id: string;
+  }
+  const Variant: ComponentType<VariantProps>;
+}