Bump TypeScript version to 2.4.2

* This is due to a bug about spread operator usage fixed on TypeScript 2.4.0 (microsoft/TypeScript#5296)
* With this change now a warning will be given about the TS version used. This is expected, you see the discussion about it  on angular/angular-cli#7625

package.json

@@ -59,6 +59,6 @@
     "protractor": "~5.1.2",
     "ts-node": "~3.2.0",
     "tslint": "~5.3.2",
-    "typescript": "2.3.4"
+    "typescript": "2.4.2"
   }
 }

src/app/shared/metric.model.ts

@@ -16,14 +16,23 @@ export class Metric {
    * parameters and/or using interfaces.
    *
    * For the sake of brevity and simplicity of this model we are gonna
-   * assume only one single constructor right now (being a single string array
-   * with all data), and depending on the mileage we might take another route.
+   * assume only one single constructor right now
+   * (̶b̶e̶i̶n̶g̶ ̶a̶ ̶s̶i̶n̶g̶l̶e̶ ̶s̶t̶r̶i̶n̶g̶ ̶a̶r̶r̶a̶y̶ ̶w̶i̶t̶h̶ ̶a̶l̶l̶ ̶d̶a̶t̶a̶)̶,
+   * (being the four parameters of the model),
+   * and depending on the mileage we might take another route.
    */
-  constructor(metricData: Array<string>) {
-    this.microservice = metricData[0];
-    this.date = new Date(+metricData[1]);
-    this.metric = metricData[2];
-    this.value = +metricData[3];
+  // constructor(metricData: Array<string>) {
+  //   this.microservice = metricData[0];
+  //   this.date = new Date(+metricData[1]);
+  //   this.metric = metricData[2];
+  //   this.value = +metricData[3];
+  // }
+
+  constructor(microservice?: string, date?: string, metric?: string, value?: string) {
+    this.microservice = microservice;
+    this.date = new Date(+date);
+    this.metric = metric;
+    this.value = +value;
   }
 
 }

src/app/ws-viewer/ws-viewer.component.ts

@@ -25,7 +25,7 @@ export class WsViewerComponent implements OnInit {
     // this.subscription = this.wsService.getSubject('handshake')
     this.subscription = this.wsService.getSubject()
       .subscribe(
-        async (msg) => this.metric = new Metric((await msg).split(' '))
+        async (msg) => this.metric = new Metric(...(await msg).split(' '))
       );
   }
 

yarn.lock

@@ -5274,9 +5274,9 @@ type-is@~1.6.15:
     media-typer "0.3.0"
     mime-types "~2.1.15"
 
-typescript@2.3.4:
-  version "2.3.4"
-  resolved "https://registry.yarnpkg.com/typescript/-/typescript-2.3.4.tgz#3d38321828231e434f287514959c37a82b629f42"
+typescript@2.4.2:
+  version "2.4.2"
+  resolved "https://registry.yarnpkg.com/typescript/-/typescript-2.4.2.tgz#f8395f85d459276067c988aa41837a8f82870844"
 
 "typescript@>=2.0.0 <2.6.0", typescript@^2.3.3:
   version "2.5.2"