Added getEventArgs() to EventContext base interface. Returns null for non-save events according to Microsoft Documentation https://msdn.microsoft.com/en-us/library/gg328130.aspx#BKMK_getEventArgs

types/xrm/index.d.ts

@@ -1397,6 +1397,12 @@ declare namespace Xrm {
              */
             getDepth(): number;
 
+            /**
+             * Get event args returns null for non-save operations
+             *
+             * @return null
+             */
+            getEventArgs(): null;
             /**
              * Gets a reference to the object for which event occurred.
              *

types/xrm/v8/index.d.ts

@@ -1089,6 +1089,13 @@ declare namespace Xrm {
              */
             getDepth(): number;
 
+            /**
+             * Get event args returns null for non-save operations
+             *
+             * @return null
+             */
+            getEventArgs(): null;
+
             /**
              * Gets a reference to the object for which event occurred.
              *