[ReactNative] Bring back crash reporting

React/Base/RCTBridge.m

@@ -1038,6 +1038,9 @@ static id<RCTJavaScriptExecutor> _latestJSExecutor;
     }
     @catch (NSException *exception) {
       RCTLogError(@"Exception thrown while invoking %@ on target %@ with params %@: %@", method.JSMethodName, module, params, exception);
+      if ([exception.name rangeOfString:@"Unhandled JS Exception"].location != NSNotFound) {
+        @throw;
+      }
     }
   });
 

React/Modules/RCTExceptionsManager.h

@@ -21,4 +21,6 @@
 
 - (instancetype)initWithDelegate:(id<RCTExceptionsManagerDelegate>)delegate NS_DESIGNATED_INITIALIZER;
 
+@property (nonatomic, assign) NSUInteger maxReloadAttempts;
+
 @end

React/Modules/RCTExceptionsManager.m

@@ -9,19 +9,27 @@
 
 #import "RCTExceptionsManager.h"
 
+#import "RCTLog.h"
 #import "RCTRedBox.h"
+#import "RCTRootView.h"
 
 @implementation RCTExceptionsManager
 {
   __weak id<RCTExceptionsManagerDelegate> _delegate;
+  NSUInteger _reloadRetries;
 }
 
+#ifndef DEBUG
+static NSUInteger RCTReloadRetries = 0;
+#endif
+
 RCT_EXPORT_MODULE()
 
 - (instancetype)initWithDelegate:(id<RCTExceptionsManagerDelegate>)delegate
 {
   if ((self = [super init])) {
     _delegate = delegate;
+    _maxReloadAttempts = 0;
   }
   return self;
 }
@@ -36,9 +44,40 @@ RCT_EXPORT_METHOD(reportUnhandledException:(NSString *)message
 {
   if (_delegate) {
     [_delegate unhandledJSExceptionWithMessage:message stack:stack];
-  } else {
-    [[RCTRedBox sharedInstance] showErrorMessage:message withStack:stack];
+    return;
   }
+
+#ifdef DEBUG
+    [[RCTRedBox sharedInstance] showErrorMessage:message withStack:stack];
+#else
+  if (RCTReloadRetries < _maxReloadAttempts) {
+    RCTReloadRetries++;
+    dispatch_async(dispatch_get_main_queue(), ^{
+      [[NSNotificationCenter defaultCenter] postNotificationName:RCTReloadNotification object:nil];
+    });
+  } else {
+    NSError *error;
+    const NSUInteger MAX_SANITIZED_LENGTH = 75;
+    // Filter out numbers so the same base errors are mapped to the same categories independent of incorrect values.
+    NSString *pattern = @"[+-]?\\d+[,.]?\\d*";
+    NSRegularExpression *regex = [NSRegularExpression regularExpressionWithPattern:pattern options:0 error:&error];
+    RCTAssert(error == nil, @"Bad regex pattern: %@", pattern);
+    NSString *sanitizedMessage = [regex stringByReplacingMatchesInString:message
+                                                                 options:0
+                                                                   range:NSMakeRange(0, message.length)
+                                                            withTemplate:@"<num>"];
+    if (sanitizedMessage.length > MAX_SANITIZED_LENGTH) {
+      sanitizedMessage = [[sanitizedMessage substringToIndex:MAX_SANITIZED_LENGTH] stringByAppendingString:@"..."];
+    }
+    NSMutableString *prettyStack = [@"\n" mutableCopy];
+    for (NSDictionary *frame in stack) {
+      [prettyStack appendFormat:@"%@@%@:%@\n", frame[@"methodName"], frame[@"lineNumber"], frame[@"column"]];
+    }
+
+    NSString *name = [@"Unhandled JS Exception: " stringByAppendingString:sanitizedMessage];
+    [NSException raise:name format:@"Message: %@, stack: %@", message, prettyStack];
+  }
+#endif
 }
 
 RCT_EXPORT_METHOD(updateExceptionMessage:(NSString *)message