refactor(core): added meaningful variables for boolean checks in validation.ts

Author: Reversean

packages/core/src/utils/validation.ts

@@ -64,7 +64,9 @@ export function isValidEventPayload(payload: unknown): payload is EventData<Even
     return false;
   }
 
-  return !(payload.backtrace !== undefined && !Array.isArray(payload.backtrace));
+  const isBacktraceUndefined = payload.backtrace === undefined;
+  const isBacktraceArray = Array.isArray(payload.backtrace)
+  return isBacktraceUndefined || isBacktraceArray;
 }
 
 /**
@@ -82,5 +84,7 @@ export function isValidBreadcrumb(breadcrumb: unknown): breadcrumb is Breadcrumb
     return false;
   }
 
-  return !(breadcrumb.timestamp !== undefined && typeof breadcrumb.timestamp !== 'number');
+  const isTimestampUndefined = breadcrumb.timestamp === undefined;
+  const isTimestampNumber = typeof breadcrumb.timestamp === 'number'
+  return isTimestampUndefined || isTimestampNumber;
 }