diff --git a/index.d.ts b/index.d.ts
index ac48a0e1..571c2aba 100644
--- a/index.d.ts
+++ b/index.d.ts
@@ -45,6 +45,7 @@ interface Props {
 }
 
 declare class Pdf extends React.Component<Props, any> {
+    setPage: (pageNumber: number) => void;
 }
 
 export default Pdf;
diff --git a/index.js b/index.js
index 5cc9f192..edd49e82 100644
--- a/index.js
+++ b/index.js
@@ -375,9 +375,9 @@ export default class Pdf extends Component {
             } else if (message[0] === 'error') {
                 this._onError(new Error(message[1]));
             } else if (message[0] === 'pageSingleTap') {
-                this.props.onPageSingleTap && this.props.onPageSingleTap(message[1], message[2], message[3]);
+                this.props.onPageSingleTap && this.props.onPageSingleTap(Number(message[1]), Number(message[2]), Number(message[3]));
             } else if (message[0] === 'scaleChanged') {
-                this.props.onScaleChanged && this.props.onScaleChanged(message[1]);
+                this.props.onScaleChanged && this.props.onScaleChanged(Number(message[1]));
             } else if (message[0] === 'linkPressed') {
                 this.props.onPressLink && this.props.onPressLink(message[1]);
             }
diff --git a/index.js.flow b/index.js.flow
index 1957e5f3..148edcd8 100644
--- a/index.js.flow
+++ b/index.js.flow
@@ -58,4 +58,6 @@ export type Props = {
   testID?: string
 };
 
-declare export default class Pdf extends Component<Props> {}
+declare export default class Pdf extends Component<Props> {
+  setPage: (pageNumber: number) => void;
+}