Simplify class usage

Dashboard/src/serial/PortController.ts

@@ -1,35 +1,33 @@
 import SerialPort, { parsers } from "serialport";
 
 class PortController {
-  path: null | string;
+  path: string;
 
-  port: null | SerialPort;
+  port: SerialPort;
 
   parser: any;
 
   onCloseCallback: (error:Error)=>void;
 
-  constructor() {
+  constructor(path: string) {
-    this.path = null;
-    this.port = null;
-    this.onCloseCallback = () => {};
-  }
-
-  get isOpen() {
-    if (!this.port) {
-      return false;
-    }
-    return this.port.isOpen;
-  }
-
-  create(path: string) {
     this.path = path;
     this.port = new SerialPort(path, {
       baudRate: 9600,
       autoOpen: false,
     });
-
     this.parser = this.port.pipe(new parsers.Readline({ delimiter: "\r\n" }));
+    this.onCloseCallback = () => {};
+  }
+
+  get isOpen(): boolean {
+    if (this.port == null) {
+      return false;
+    }
+    return this.port.isOpen;
+  }
+
+  get getParser(): any {
+    return this.parser;
   }
 
   open(callback: (error:Error | null | undefined)=>void, onCloseCallback:(error:Error | null | undefined)=>void) {
@@ -37,10 +35,6 @@ class PortController {
       throw new Error("Port already open");
     }
 
-    if (this.port === null) {
-      throw new Error("Port must be created first");
-    }
-
     this.port.open((error) => callback(error));
     this.port.on("close", onCloseCallback);
     this.onCloseCallback = onCloseCallback;