fix(core): update

ts/dnsly.plugins.ts

@@ -13,3 +13,10 @@ export { smartdelay, smartpromise, smartrequest };
 import * as tsclass from '@tsclass/tsclass';
 
 export { tsclass };
+
+// third party scope
+import dns2 from 'dns2';
+
+export {
+  dns2
+}

ts/index.ts

@@ -24,6 +24,8 @@ export class Smartdns {
   public dnsServerIp: string;
   public dnsServerPort: number;
 
+  public dns2 = new plugins.dns2();
+
   public dnsTypeMap: { [key: string]: number } = {
     A: 1,
     AAAA: 28,
@@ -65,6 +67,8 @@ export class Smartdns {
             return true;
           } else {
             await plugins.smartdelay.delayFor(intervalArg);
+            // lets try backup strategy
+            const backupResult = this.dns2[`resolve${recordTypeArg}`]('google.com')
             return await doCheck();
           }
         } catch (err) {