fix: use loglevel-mixin and calling super()

Author: arlac77

lib/model.js

@@ -1,29 +1,32 @@
 /* jslint node: true, esnext: true */
 "use strict";
 
-// const llm = require('loglevel-mixin');
-// class _Model {}
-// llm.defineLoggerMethods(_Model.prototype, llm.defaultLogLevels);
-// class Model extends llm.LogLevelMixin(_Model, llm.defaultLogLevels,
-// 	llm.defaultLogLevels.info) {
-
-class Model {
+const llm = require('loglevel-mixin');
+class _Model {}
+llm.defineLoggerMethods(_Model.prototype, llm.defaultLogLevels);
+class Model extends llm.LogLevelMixin(_Model, llm.defaultLogLevels,
+	llm.defaultLogLevels.info) {
 
 	log(level, arg) {
+		this._validationErrorCount++;
 		console.log(`logging goes here: ${level} ${arg}`);
 	}
 
-	error(message) {
-		this._validationErrorCount++;
-		console.log(message);
-	}
+	/*
+		error(message) {
+			this._validationErrorCount++;
+			console.log(message);
+		}
 
-	warning(message) {
-		this._validationErrorCount++;
-		console.log(message);
-	}
+		warning(message) {
+			this._validationErrorCount++;
+			console.log(message);
+		}
+	*/
 
 	constructor(opt) {
+		super();
+
 		// lookup for all the vertices
 		this.vertices = {};
 		// lookup for all the edges