chore: eslint and fix up old code

src/app.ts

@@ -9,7 +9,7 @@ import { startTLSServer } from './tls/crypt';
 
 /* test node version */
 const testSocket = startTLSServer();
-if (typeof (testSocket.tls as any).exportKeyingMaterial !== 'function') {
+if (typeof testSocket.tls.exportKeyingMaterial !== 'function') {
 	console.error(`UNSUPPORTED NODE VERSION (${process.version}) FOUND!!`);
 
 	console.log('min version supported is node js 14. run "sudo npx n 14"');

src/radius/handler/eap/eapMethods/EAP-TTLS.ts

@@ -23,12 +23,10 @@ import { secret } from '../../../../../config';
 
 const log = debug('radius:eap:ttls');
 
-function tlsHasExportKeyingMaterial(
+function tlsHasExportKeyingMaterial(tlsSocket): tlsSocket is {
-	tlsSocket
-): tlsSocket is {
 	exportKeyingMaterial: (length: number, label: string, context?: Buffer) => Buffer;
 } {
-	return typeof (tlsSocket as any).exportKeyingMaterial === 'function';
+	return typeof tlsSocket.exportKeyingMaterial === 'function';
 }
 
 interface IAVPEntry {