feat: compare fingerprints for repeated message-based events

Author: kevinehosford

packages/raven-js/src/raven.js

@@ -1921,6 +1921,9 @@ Raven.prototype = {
     } else if (current.exception || last.exception) {
       // Exception interface (i.e. from captureException/onerror)
       return isSameException(current.exception, last.exception);
+    } else if (current.fingerprint || last.fingerprint) {
+      return Boolean(current.fingerprint && last.fingerprint) &&
+        JSON.stringify(current.fingerprint) === JSON.stringify(last.fingerprint)
     }
 
     return true;

packages/raven-js/test/raven.test.js

@@ -3856,6 +3856,30 @@ describe('Raven (private methods)', function() {
         assert.isFalse(Raven._isRepeatData(data));
       });
 
+      it('should return false for different fingerprints', function() {
+        var data = JSON.parse(JSON.stringify(Raven._lastData)); // copy
+        data.fingerprint = ['{{ default }}', 'grouping-identifier'];
+
+        assert.isFalse(Raven._isRepeatData(data));
+
+        Raven._lastData.fingerprint = ['{{ default }}', 'other-grouping-identifier'];
+
+        assert.isFalse(Raven._isRepeatData(data));
+
+        delete data.fingerprint;
+
+        assert.isFalse(Raven._isRepeatData(data));
+      });
+
+      it('should return false for different messages and identical fingerprints', function () {
+        Raven._lastData.message = 'the thing broke';
+        Raven._lastData.fingerprint = ['{{ default }}', 'grouping-identifier'];
+        var data = JSON.parse(JSON.stringify(Raven._lastData)); // copy
+        data.message = 'the other thing broke';
+
+        assert.isFalse(Raven._isRepeatData(data));
+      });
+
       it('should return false for different captureMessage payloads w/ synthetic traces', function() {
         Raven._lastData.stacktrace = {
           frames: [