[Home](./index.md) > [@snowplow/react-native-tracker](./react-native-tracker.md) > [WebViewMessageHandler](./react-native-tracker.webviewmessagehandler.md) ## WebViewMessageHandler type A callback to be used for the `onMessage` prop of a `WebView` component. Signature: ```typescript export declare type WebViewMessageHandler = (message: { nativeEvent: { data: string; }; }) => void; ```