sonic-boom.reopen file descriptor should be optional

types/sonic-boom/index.d.ts

@@ -31,7 +31,7 @@ declare class SonicBoom extends EventEmitter {
     /**
      * Reopen the file in place, useful for log rotation.
      */
-    reopen(file: string): void;
+    reopen(fileDescriptor?: string | number): void;
 
     /**
      * Flushes the buffered data synchronously. This is a costly operation.

types/sonic-boom/sonic-boom-tests.ts

@@ -7,6 +7,8 @@ sonic.flush();
 
 sonic.flushSync();
 
+sonic.reopen();
+
 sonic.end();
 
 sonic.destroy();