refactor: set changedRows as a required property of ResultSetHeader

Author: wellwelwel

lib/packets/resultset_header.js

@@ -94,6 +94,8 @@ class ResultSetHeader {
     const m = this.info.match(/\schanged:\s*(\d+)/i);
     if (m !== null) {
       this.changedRows = parseInt(m[1], 10);
+    } else {
+      this.changedRows = 0;
     }
   }
 

typings/mysql/lib/protocol/packets/ResultSetHeader.d.ts

@@ -8,7 +8,7 @@ declare interface ResultSetHeader {
   insertId: number;
   serverStatus: number;
   warningStatus: number;
-  changedRows?: number;
+  changedRows: number;
 }
 
 export { ResultSetHeader };