refactor(errors): add HttpError class and extend existing errors from it

src/errors/http_error.ts

@@ -0,0 +1,13 @@
+class HttpError extends Error {
+
+    statusCode: number;
+
+    constructor(message: string, statusCode: number) {
+        super(message);
+        this.name = "HttpError";
+        this.statusCode = statusCode;
+    }
+
+}
+
+export default HttpError;

src/errors/not_found_error.ts

@@ -1,10 +1,12 @@
-class NotFoundError extends Error {
-    statusCode: number;
+import HttpError from "./http_error.js";
+
+class NotFoundError extends HttpError {
+
     constructor(message: string) {
-        super(message);
+        super(message, 404);
         this.name = "NotFoundError";
-        this.statusCode = 404;
     }
+
 }
 
 export default NotFoundError;

src/errors/validation_error.ts

@@ -1,9 +1,10 @@
-class ValidationError extends Error {
-    statusCode: number;
+import HttpError from "./http_error.js";
+
+class ValidationError extends HttpError {
+
     constructor(message: string) {
-        super(message)
+        super(message, 400)
         this.name = "ValidationError";
-        this.statusCode = 400;
     }
 
 }