Add onFileDownload

Author: MoOx

README.md

@@ -615,6 +615,14 @@ Specifies function to be invoked when the WebView content process is terminated.
 />
 ```
 
+#### `onFileDownload: WebViewDownloadEvent.t => unit`
+
+_iOS only_
+
+Specifies function to be invoked when the `WebView` is about to download a file.
+
+<https://github.com/react-native-webview/react-native-webview/blob/master/docs/Reference.md#onFileDownload>
+
 #### `onError: WebViewErrorEvent.t => unit`
 
 Specifies function to be invoked when the `WebView` fails to load.

src/ReactNativeWebView.bs.js

@@ -8,6 +8,10 @@ var Source = {};
 
 Event$ReactNative.SyntheticEvent({});
 
+var WebViewDownloadEvent = {};
+
+Event$ReactNative.SyntheticEvent({});
+
 var WebViewErrorEvent = {};
 
 Event$ReactNative.SyntheticEvent({});
@@ -42,6 +46,7 @@ exports.Source = Source;
 exports.DataDetectorTypes = DataDetectorTypes;
 exports.DecelerationRate = DecelerationRate;
 exports.NavigationType = NavigationType;
+exports.WebViewDownloadEvent = WebViewDownloadEvent;
 exports.WebViewErrorEvent = WebViewErrorEvent;
 exports.WebViewHttpErrorEvent = WebViewHttpErrorEvent;
 exports.WebViewMessageEvent = WebViewMessageEvent;

src/ReactNativeWebView.re

@@ -87,6 +87,14 @@ class type virtual webViewShouldStartLoadWithRequest = {
 
 type webViewNavigationOrError;
 
+module WebViewDownloadEvent = {
+  type payload = {downloadUrl: string};
+
+  include Event.SyntheticEvent({
+    type _payload = payload;
+  });
+};
+
 module WebViewErrorEvent = {
   type payload = Js.t(webViewError);
   include Event.SyntheticEvent({
@@ -192,6 +200,7 @@ external make:
     ~mixedContentMode: [ | `never | `always | `compatibility]=?,
     ~nativeConfig: nativeConfig=?,
     ~onContentProcessDidTerminate: WebViewTerminatedEvent.t => unit=?,
+    ~onFileDownload: WebViewDownloadEvent.t => unit=?,
     ~onError: WebViewErrorEvent.t => unit=?,
     ~onHttpError: WebViewHttpErrorEvent.t => unit=?,
     ~onLoad: WebViewNavigationEvent.t => unit=?,