From f85e5d8434b47e053a2da154876f1279b8365357 Mon Sep 17 00:00:00 2001
From: Luke Miles <luke@restocks.io>
Date: Tue, 6 Dec 2016 18:23:41 -0800
Subject: [PATCH 01/13] Add injectJavaScript function for iOS webviews

---
 Libraries/Components/WebView/WebView.ios.js | 12 ++++++++++++
 React/Views/RCTWebView.h                    |  1 +
 React/Views/RCTWebView.m                    |  5 +++++
 React/Views/RCTWebViewManager.m             | 12 ++++++++++++
 4 files changed, 30 insertions(+)

diff --git a/Libraries/Components/WebView/WebView.ios.js b/Libraries/Components/WebView/WebView.ios.js
index 7961d777f7fc..5fe2035d7472 100644
--- a/Libraries/Components/WebView/WebView.ios.js
+++ b/Libraries/Components/WebView/WebView.ios.js
@@ -489,6 +489,18 @@ class WebView extends React.Component {
     );
   };
 
+  /**
+    * Injects Javascript into the currently
+    * running view.
+     */
+  injectJavaScript = (data) => {
+    UIManager.dispatchViewManagerCommand(
+      this.getWebViewHandle(),
+      UIManager.RCTWebView.Commands.injectJavaScript,
+      [String(data)]
+    );
+  };
+
   /**
    * We return an event with a bunch of fields including:
    *  url, title, loading, canGoBack, canGoForward
diff --git a/React/Views/RCTWebView.h b/React/Views/RCTWebView.h
index e4f57567d3a3..92e9c6bb7ea7 100644
--- a/React/Views/RCTWebView.h
+++ b/React/Views/RCTWebView.h
@@ -43,5 +43,6 @@ shouldStartLoadForRequest:(NSMutableDictionary<NSString *, id> *)request
 - (void)reload;
 - (void)stopLoading;
 - (void)postMessage:(NSString *)message;
+- (void)injectJavaScript:(NSString *)script;
 
 @end
diff --git a/React/Views/RCTWebView.m b/React/Views/RCTWebView.m
index 23fe37b84dca..7220fddeb8b3 100644
--- a/React/Views/RCTWebView.m
+++ b/React/Views/RCTWebView.m
@@ -96,6 +96,11 @@ - (void)postMessage:(NSString *)message
   [_webView stringByEvaluatingJavaScriptFromString:source];
 }
 
+- (void)injectJavaScript:(NSString *)script
+{
+  [_webView stringByEvaluatingJavaScriptFromString:script];
+}
+
 - (void)setSource:(NSDictionary *)source
 {
   if (![_source isEqualToDictionary:source]) {
diff --git a/React/Views/RCTWebViewManager.m b/React/Views/RCTWebViewManager.m
index 2730124fffa2..ddc66e2b8f13 100644
--- a/React/Views/RCTWebViewManager.m
+++ b/React/Views/RCTWebViewManager.m
@@ -111,6 +111,18 @@ - (UIView *)view
   }];
 }
 
+RCT_EXPORT_METHOD(injectJavaScript:(nonnull NSNumber *)reactTag script:(NSString *)script)
+{
+  [self.bridge.uiManager addUIBlock:^(__unused RCTUIManager *uiManager, NSDictionary<NSNumber *, RCTWebView *> *viewRegistry) {
+    RCTWebView *view = viewRegistry[reactTag];
+    if (![view isKindOfClass:[RCTWebView class]]) {
+      RCTLogError(@"Invalid view returned from registry, expecting RCTWebView, got: %@", view);
+    } else {
+      [view injectJavaScript:script];
+    }
+  }];
+}
+
 #pragma mark - Exported synchronous methods
 
 - (BOOL)webView:(__unused RCTWebView *)webView

From 55d38af0170415c9cba7a4ce91aa0dc03ccaeddf Mon Sep 17 00:00:00 2001
From: Luke Miles <luke@restocks.io>
Date: Wed, 7 Dec 2016 16:20:35 -0800
Subject: [PATCH 02/13] Add android support for webview JS injection

---
 Libraries/Components/WebView/WebView.android.js           | 8 ++++++++
 .../facebook/react/views/webview/ReactWebViewManager.java | 8 +++++++-
 2 files changed, 15 insertions(+), 1 deletion(-)

diff --git a/Libraries/Components/WebView/WebView.android.js b/Libraries/Components/WebView/WebView.android.js
index 4617b2cb6a73..bf326bd96cac 100644
--- a/Libraries/Components/WebView/WebView.android.js
+++ b/Libraries/Components/WebView/WebView.android.js
@@ -286,6 +286,14 @@ class WebView extends React.Component {
     );
   };
 
+  injectJavaScript = (data) => {
+    UIManager.dispatchViewManagerCommand(
+      this.getWebViewHandle(),
+      UIManager.RCTWebView.Commands.injectJavaScript,
+      [String(data)]
+    );
+  };
+
   /**
    * We return an event with a bunch of fields including:
    *  url, title, loading, canGoBack, canGoForward
diff --git a/ReactAndroid/src/main/java/com/facebook/react/views/webview/ReactWebViewManager.java b/ReactAndroid/src/main/java/com/facebook/react/views/webview/ReactWebViewManager.java
index 650701851877..73412959d3c5 100644
--- a/ReactAndroid/src/main/java/com/facebook/react/views/webview/ReactWebViewManager.java
+++ b/ReactAndroid/src/main/java/com/facebook/react/views/webview/ReactWebViewManager.java
@@ -95,6 +95,7 @@ public class ReactWebViewManager extends SimpleViewManager<WebView> {
   public static final int COMMAND_RELOAD = 3;
   public static final int COMMAND_STOP_LOADING = 4;
   public static final int COMMAND_POST_MESSAGE = 5;
+  public static final int COMMAND_INJECT_JAVASCRIPT = 6;
 
   // Use `webView.loadUrl("about:blank")` to reliably reset the view
   // state and release page resources (including any running JavaScript).
@@ -477,7 +478,9 @@ protected void addEventEmitters(ThemedReactContext reactContext, WebView view) {
         "goForward", COMMAND_GO_FORWARD,
         "reload", COMMAND_RELOAD,
         "stopLoading", COMMAND_STOP_LOADING,
-        "postMessage", COMMAND_POST_MESSAGE);
+        "postMessage", COMMAND_POST_MESSAGE,
+        "injectJavaScript", COMMAND_INJECT_JAVASCRIPT
+      );
   }
 
   @Override
@@ -504,6 +507,9 @@ public void receiveCommand(WebView root, int commandId, @Nullable ReadableArray
           throw new RuntimeException(e);
         }
         break;
+      case COMMAND_INJECT_JAVASCRIPT:
+        root.loadUrl("javascript:" + args.getString(0);
+        break;
     }
   }
 

From 3e821177e6e53ea6865daba252a43b68a1295d5c Mon Sep 17 00:00:00 2001
From: Luke Miles <luke@restocks.io>
Date: Wed, 7 Dec 2016 16:34:40 -0800
Subject: [PATCH 03/13] Fix typo: close parentheses

---
 .../com/facebook/react/views/webview/ReactWebViewManager.java   | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/ReactAndroid/src/main/java/com/facebook/react/views/webview/ReactWebViewManager.java b/ReactAndroid/src/main/java/com/facebook/react/views/webview/ReactWebViewManager.java
index 73412959d3c5..9671dac654e1 100644
--- a/ReactAndroid/src/main/java/com/facebook/react/views/webview/ReactWebViewManager.java
+++ b/ReactAndroid/src/main/java/com/facebook/react/views/webview/ReactWebViewManager.java
@@ -508,7 +508,7 @@ public void receiveCommand(WebView root, int commandId, @Nullable ReadableArray
         }
         break;
       case COMMAND_INJECT_JAVASCRIPT:
-        root.loadUrl("javascript:" + args.getString(0);
+        root.loadUrl("javascript:" + args.getString(0));
         break;
     }
   }

From 00c03f5ef4fdb6654b7f4bf2dbd9efca186321c7 Mon Sep 17 00:00:00 2001
From: Luke Miles <luke@restocks.io>
Date: Thu, 8 Dec 2016 12:40:52 -0800
Subject: [PATCH 04/13] Add test for injectJS to UIExplorer

---
 Examples/UIExplorer/js/WebViewExample.js | 39 +++++++++++++++++++++++-
 1 file changed, 38 insertions(+), 1 deletion(-)

diff --git a/Examples/UIExplorer/js/WebViewExample.js b/Examples/UIExplorer/js/WebViewExample.js
index be1fb44aec11..1d1283c1dd22 100644
--- a/Examples/UIExplorer/js/WebViewExample.js
+++ b/Examples/UIExplorer/js/WebViewExample.js
@@ -264,6 +264,39 @@ class MessagingTest extends React.Component {
   }
 }
 
+class InjectJS extends React.Component {
+  webview = null;
+  injectJS = () => {
+    const script = `
+    var colors = ['green', 'red', 'blue', 'purple', 'yellow'];
+    var color = colors[Math.floor(Math.random() * colors.length)];
+    document.body.style.backgroundColor = color;
+    `;
+    if (this.webview) {
+      this.webview.injectJavaScript(script);
+    }
+  }
+  render() {
+    return (
+      <View>
+        <WebView
+          ref={webview => { this.webview = webview; }}
+          style={{
+            backgroundColor: BGWASH,
+            height: 300,
+          }}
+          source={{uri: 'https://www.google.com'}}
+          scalesPageToFit={true}
+        />
+        <View style={styles.buttons}>
+          <Button text="Inject JS (change bg color of webpage)" enabled onPress={this.injectJS} />
+        </View>
+    </View>
+    );
+  }
+}
+
+
 var styles = StyleSheet.create({
   container: {
     flex: 1,
@@ -442,5 +475,9 @@ exports.examples = [
   {
     title: 'Mesaging Test',
     render(): ReactElement<any> { return <MessagingTest />; }
-  }
+  },
+  {
+    title: 'Inject JavaScript',
+    render(): React.Element<any> { return <InjectJS/>; }
+  },
 ];

From 0987da294bd865426261c1cad862aba0bb9c1b6e Mon Sep 17 00:00:00 2001
From: Luke Miles <luke@restocks.io>
Date: Thu, 8 Dec 2016 12:47:53 -0800
Subject: [PATCH 05/13] Improve comments for method

---
 Libraries/Components/WebView/WebView.android.js |  8 ++++++++
 Libraries/Components/WebView/WebView.ios.js     | 10 +++++++---
 2 files changed, 15 insertions(+), 3 deletions(-)

diff --git a/Libraries/Components/WebView/WebView.android.js b/Libraries/Components/WebView/WebView.android.js
index bf326bd96cac..670923e893d9 100644
--- a/Libraries/Components/WebView/WebView.android.js
+++ b/Libraries/Components/WebView/WebView.android.js
@@ -286,6 +286,14 @@ class WebView extends React.Component {
     );
   };
 
+  /**
+    * Injects a javascript string into the referenced
+    * WebView. Deliberately does not return a response
+    * because using eval() to return a response breaks
+    * this method on pages with a Content Security Policy
+    * that disallows eval(). If you need that functionality,
+    * look into postMessage/onMessage.
+    */
   injectJavaScript = (data) => {
     UIManager.dispatchViewManagerCommand(
       this.getWebViewHandle(),
diff --git a/Libraries/Components/WebView/WebView.ios.js b/Libraries/Components/WebView/WebView.ios.js
index 5fe2035d7472..21822e0886de 100644
--- a/Libraries/Components/WebView/WebView.ios.js
+++ b/Libraries/Components/WebView/WebView.ios.js
@@ -490,9 +490,13 @@ class WebView extends React.Component {
   };
 
   /**
-    * Injects Javascript into the currently
-    * running view.
-     */
+    * Injects a javascript string into the referenced
+    * WebView. Deliberately does not return a response
+    * because using eval() to return a response breaks
+    * this method on pages with a Content Security Policy
+    * that disallows eval(). If you need that functionality,
+    * look into postMessage/onMessage.
+    */
   injectJavaScript = (data) => {
     UIManager.dispatchViewManagerCommand(
       this.getWebViewHandle(),

From 43ce911dcd8ca86ce50d31a2266c79564af6b7b1 Mon Sep 17 00:00:00 2001
From: Luke Miles <luke@restocks.io>
Date: Mon, 12 Dec 2016 15:05:40 -0800
Subject: [PATCH 06/13] Fix comment indentation

---
 Libraries/Components/WebView/WebView.android.js | 14 +++++++-------
 Libraries/Components/WebView/WebView.ios.js     | 14 +++++++-------
 2 files changed, 14 insertions(+), 14 deletions(-)

diff --git a/Libraries/Components/WebView/WebView.android.js b/Libraries/Components/WebView/WebView.android.js
index 670923e893d9..67101a7369f5 100644
--- a/Libraries/Components/WebView/WebView.android.js
+++ b/Libraries/Components/WebView/WebView.android.js
@@ -287,13 +287,13 @@ class WebView extends React.Component {
   };
 
   /**
-    * Injects a javascript string into the referenced
-    * WebView. Deliberately does not return a response
-    * because using eval() to return a response breaks
-    * this method on pages with a Content Security Policy
-    * that disallows eval(). If you need that functionality,
-    * look into postMessage/onMessage.
-    */
+  * Injects a javascript string into the referenced
+  * WebView. Deliberately does not return a response
+  * because using eval() to return a response breaks
+  * this method on pages with a Content Security Policy
+  * that disallows eval(). If you need that functionality,
+  * look into postMessage/onMessage.
+  */
   injectJavaScript = (data) => {
     UIManager.dispatchViewManagerCommand(
       this.getWebViewHandle(),
diff --git a/Libraries/Components/WebView/WebView.ios.js b/Libraries/Components/WebView/WebView.ios.js
index 21822e0886de..3de2bbb0d4b8 100644
--- a/Libraries/Components/WebView/WebView.ios.js
+++ b/Libraries/Components/WebView/WebView.ios.js
@@ -490,13 +490,13 @@ class WebView extends React.Component {
   };
 
   /**
-    * Injects a javascript string into the referenced
-    * WebView. Deliberately does not return a response
-    * because using eval() to return a response breaks
-    * this method on pages with a Content Security Policy
-    * that disallows eval(). If you need that functionality,
-    * look into postMessage/onMessage.
-    */
+  * Injects a javascript string into the referenced
+  * WebView. Deliberately does not return a response
+  * because using eval() to return a response breaks
+  * this method on pages with a Content Security Policy
+  * that disallows eval(). If you need that functionality,
+  * look into postMessage/onMessage.
+  */
   injectJavaScript = (data) => {
     UIManager.dispatchViewManagerCommand(
       this.getWebViewHandle(),

From d2f4f6642cb70b796cc1daf893715b0d0bda0fad Mon Sep 17 00:00:00 2001
From: Luke Miles <luke@restocks.io>
Date: Mon, 12 Dec 2016 15:06:18 -0800
Subject: [PATCH 07/13] Add space after component name

---
 Examples/UIExplorer/js/WebViewExample.js | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/Examples/UIExplorer/js/WebViewExample.js b/Examples/UIExplorer/js/WebViewExample.js
index 1d1283c1dd22..789c404a74b6 100644
--- a/Examples/UIExplorer/js/WebViewExample.js
+++ b/Examples/UIExplorer/js/WebViewExample.js
@@ -478,6 +478,6 @@ exports.examples = [
   },
   {
     title: 'Inject JavaScript',
-    render(): React.Element<any> { return <InjectJS/>; }
+    render(): React.Element<any> { return <InjectJS />; }
   },
 ];

From 2b098454059638be02734e7e69d2ebf322c6593e Mon Sep 17 00:00:00 2001
From: Luke Miles <luke@restocks.io>
Date: Mon, 12 Dec 2016 17:18:25 -0800
Subject: [PATCH 08/13] Tweak example test

---
 Examples/UIExplorer/js/WebViewExample.js | 10 +++-------
 1 file changed, 3 insertions(+), 7 deletions(-)

diff --git a/Examples/UIExplorer/js/WebViewExample.js b/Examples/UIExplorer/js/WebViewExample.js
index 789c404a74b6..53c59f905ada 100644
--- a/Examples/UIExplorer/js/WebViewExample.js
+++ b/Examples/UIExplorer/js/WebViewExample.js
@@ -267,11 +267,7 @@ class MessagingTest extends React.Component {
 class InjectJS extends React.Component {
   webview = null;
   injectJS = () => {
-    const script = `
-    var colors = ['green', 'red', 'blue', 'purple', 'yellow'];
-    var color = colors[Math.floor(Math.random() * colors.length)];
-    document.body.style.backgroundColor = color;
-    `;
+    const script = 'document.write("Injected JS ")';
     if (this.webview) {
       this.webview.injectJavaScript(script);
     }
@@ -285,11 +281,11 @@ class InjectJS extends React.Component {
             backgroundColor: BGWASH,
             height: 300,
           }}
-          source={{uri: 'https://www.google.com'}}
+          source={{uri: "https://www.facebook.com"}}
           scalesPageToFit={true}
         />
         <View style={styles.buttons}>
-          <Button text="Inject JS (change bg color of webpage)" enabled onPress={this.injectJS} />
+          <Button text="Inject JS" enabled onPress={this.injectJS} />
         </View>
     </View>
     );

From 6206476a08367026392efe6efc496a9ced47f47c Mon Sep 17 00:00:00 2001
From: Luke Miles <luke@restocks.io>
Date: Mon, 12 Dec 2016 18:49:48 -0800
Subject: [PATCH 09/13] fix quotes

---
 Examples/UIExplorer/js/WebViewExample.js | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/Examples/UIExplorer/js/WebViewExample.js b/Examples/UIExplorer/js/WebViewExample.js
index 53c59f905ada..f64d1116209e 100644
--- a/Examples/UIExplorer/js/WebViewExample.js
+++ b/Examples/UIExplorer/js/WebViewExample.js
@@ -267,7 +267,7 @@ class MessagingTest extends React.Component {
 class InjectJS extends React.Component {
   webview = null;
   injectJS = () => {
-    const script = 'document.write("Injected JS ")';
+    const script = `document.write('Injected JS ')`;
     if (this.webview) {
       this.webview.injectJavaScript(script);
     }

From e90335eca2f22f5939b918901e302c6525820c7c Mon Sep 17 00:00:00 2001
From: Luke Miles <luke@restocks.io>
Date: Mon, 12 Dec 2016 20:35:22 -0800
Subject: [PATCH 10/13] trick stupid linter

---
 Examples/UIExplorer/js/WebViewExample.js | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/Examples/UIExplorer/js/WebViewExample.js b/Examples/UIExplorer/js/WebViewExample.js
index f64d1116209e..0429ad4a916a 100644
--- a/Examples/UIExplorer/js/WebViewExample.js
+++ b/Examples/UIExplorer/js/WebViewExample.js
@@ -267,7 +267,7 @@ class MessagingTest extends React.Component {
 class InjectJS extends React.Component {
   webview = null;
   injectJS = () => {
-    const script = `document.write('Injected JS ')`;
+    const script = `document.write("I'm injected! ")`;
     if (this.webview) {
       this.webview.injectJavaScript(script);
     }

From b6210613dba4dcc25d0adae66ab83a744d43ddb1 Mon Sep 17 00:00:00 2001
From: Luke Miles <luke@restocks.io>
Date: Mon, 12 Dec 2016 21:38:32 -0800
Subject: [PATCH 11/13] disable linter on infringing line

---
 Examples/UIExplorer/js/WebViewExample.js | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/Examples/UIExplorer/js/WebViewExample.js b/Examples/UIExplorer/js/WebViewExample.js
index 0429ad4a916a..2008e467c6e0 100644
--- a/Examples/UIExplorer/js/WebViewExample.js
+++ b/Examples/UIExplorer/js/WebViewExample.js
@@ -267,7 +267,7 @@ class MessagingTest extends React.Component {
 class InjectJS extends React.Component {
   webview = null;
   injectJS = () => {
-    const script = `document.write("I'm injected! ")`;
+    const script = 'document.write("Injected JS ")';  // eslint-disable-line quotes
     if (this.webview) {
       this.webview.injectJavaScript(script);
     }

From 9b46d04bb7a8ca2594c298699981966fd1d2e2cb Mon Sep 17 00:00:00 2001
From: Luke Miles <luke@restocks.io>
Date: Fri, 6 Jan 2017 14:56:45 -0800
Subject: [PATCH 12/13] Fix single quote; don't cast to string

---
 Examples/UIExplorer/js/WebViewExample.js        | 2 +-
 Libraries/Components/WebView/WebView.android.js | 2 +-
 Libraries/Components/WebView/WebView.ios.js     | 2 +-
 3 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/Examples/UIExplorer/js/WebViewExample.js b/Examples/UIExplorer/js/WebViewExample.js
index 2008e467c6e0..a0f3c635737c 100644
--- a/Examples/UIExplorer/js/WebViewExample.js
+++ b/Examples/UIExplorer/js/WebViewExample.js
@@ -281,7 +281,7 @@ class InjectJS extends React.Component {
             backgroundColor: BGWASH,
             height: 300,
           }}
-          source={{uri: "https://www.facebook.com"}}
+          source={{uri: 'https://www.facebook.com'}}
           scalesPageToFit={true}
         />
         <View style={styles.buttons}>
diff --git a/Libraries/Components/WebView/WebView.android.js b/Libraries/Components/WebView/WebView.android.js
index 67101a7369f5..2ef606d5f1b4 100644
--- a/Libraries/Components/WebView/WebView.android.js
+++ b/Libraries/Components/WebView/WebView.android.js
@@ -298,7 +298,7 @@ class WebView extends React.Component {
     UIManager.dispatchViewManagerCommand(
       this.getWebViewHandle(),
       UIManager.RCTWebView.Commands.injectJavaScript,
-      [String(data)]
+      [data]
     );
   };
 
diff --git a/Libraries/Components/WebView/WebView.ios.js b/Libraries/Components/WebView/WebView.ios.js
index 3de2bbb0d4b8..5305d34b7738 100644
--- a/Libraries/Components/WebView/WebView.ios.js
+++ b/Libraries/Components/WebView/WebView.ios.js
@@ -501,7 +501,7 @@ class WebView extends React.Component {
     UIManager.dispatchViewManagerCommand(
       this.getWebViewHandle(),
       UIManager.RCTWebView.Commands.injectJavaScript,
-      [String(data)]
+      [data]
     );
   };
 

From 02704cdcfc11681fbe26d6c5d6d7369e0b8216f1 Mon Sep 17 00:00:00 2001
From: Luke Miles <luke@restocks.io>
Date: Fri, 6 Jan 2017 15:02:13 -0800
Subject: [PATCH 13/13] Fix wrapping of comments

---
 Libraries/Components/WebView/WebView.android.js | 10 ++++------
 Libraries/Components/WebView/WebView.ios.js     | 10 ++++------
 2 files changed, 8 insertions(+), 12 deletions(-)

diff --git a/Libraries/Components/WebView/WebView.android.js b/Libraries/Components/WebView/WebView.android.js
index 2ef606d5f1b4..294095035d36 100644
--- a/Libraries/Components/WebView/WebView.android.js
+++ b/Libraries/Components/WebView/WebView.android.js
@@ -287,12 +287,10 @@ class WebView extends React.Component {
   };
 
   /**
-  * Injects a javascript string into the referenced
-  * WebView. Deliberately does not return a response
-  * because using eval() to return a response breaks
-  * this method on pages with a Content Security Policy
-  * that disallows eval(). If you need that functionality,
-  * look into postMessage/onMessage.
+  * Injects a javascript string into the referenced WebView. Deliberately does not
+  * return a response because using eval() to return a response breaks this method
+  * on pages with a Content Security Policy that disallows eval(). If you need that
+  * functionality, look into postMessage/onMessage.
   */
   injectJavaScript = (data) => {
     UIManager.dispatchViewManagerCommand(
diff --git a/Libraries/Components/WebView/WebView.ios.js b/Libraries/Components/WebView/WebView.ios.js
index 5305d34b7738..15409e2cc2b2 100644
--- a/Libraries/Components/WebView/WebView.ios.js
+++ b/Libraries/Components/WebView/WebView.ios.js
@@ -490,12 +490,10 @@ class WebView extends React.Component {
   };
 
   /**
-  * Injects a javascript string into the referenced
-  * WebView. Deliberately does not return a response
-  * because using eval() to return a response breaks
-  * this method on pages with a Content Security Policy
-  * that disallows eval(). If you need that functionality,
-  * look into postMessage/onMessage.
+  * Injects a javascript string into the referenced WebView. Deliberately does not
+  * return a response because using eval() to return a response breaks this method
+  * on pages with a Content Security Policy that disallows eval(). If you need that
+  * functionality, look into postMessage/onMessage.
   */
   injectJavaScript = (data) => {
     UIManager.dispatchViewManagerCommand(