Add TypeScript definition

Author: chiefGui

index.d.ts

@@ -0,0 +1,35 @@
+declare module "react-visibility-sensor" {
+  import * as React from "react";
+
+  interface Shape {
+    top?: number;
+    left?: number;
+    bottom?: number;
+    right?: number;
+  }
+
+  interface Props {
+    onChange?: (isVisible: boolean) => void;
+    active?: boolean;
+    partialVisibility?: boolean;
+    offset?: Shape;
+    minTopValue?: number;
+    intervalCheck?: boolean;
+    intervalDelay?: number;
+    scrollCheck?: boolean;
+    scrollDelay?: number;
+    scrollThrottle?: number;
+    resizeCheck?: boolean;
+    resizeDelay?: number;
+    resizeThrottle?: number;
+    containment?: any;
+    delayedCall?: boolean;
+    children?: (
+      args: { isVisible: boolean; visibilityRect?: Shape }
+    ) => React.ReactNode;
+  }
+
+  const ReactVisibilitySensor: React.StatelessComponent<Props>;
+
+  export default ReactVisibilitySensor;
+}