Add typescript definitions

src/index.d.ts

@@ -65,7 +65,7 @@ export function onError(cb: (error: Error) => void): () => void
 
 export class Provider extends React.Component<any, {}> {}
 
-export class Observer extends React.Component<{ children?: () => React.ReactNode }, {}> {}
+export class Observer extends React.Component<{ children?: () => React.ReactNode, render?: () => React.ReactNode, inject?: IStoresToProps |  string[] }, {}> {}
 
 export function useStaticRendering(value: boolean): void
 

test/ts/compile-ts.tsx

@@ -191,6 +191,18 @@ class ObserverTest extends Component<any, any> {
 	}
 }
 
+class ObserverTest2 extends Component<any, any> {
+	render() {
+		return <Observer render={() => <div>test</div>} />;
+	}
+}
+
+class ObserverTest3 extends Component<any, any> {
+	render() {
+		return <Observer inject={["store"]} render={() => <div>test</div>} />;
+	}
+}
+
 @observer
 class ComponentWithoutPropsAndState extends Component<{}, {}> {
     componentDidUpdate() {