create base error class & unified error import #3

api/src/errors/lib-error.ts

@@ -0,0 +1,14 @@
+// Errors in custom libs
+import { BaseError } from "./base-error";
+
+export class LibError extends BaseError{}
+
+export class FetchError extends LibError{
+    constructor(cause?: unknown, source?: string){
+        super(
+            source
+            ? `Fetching data from ${source} failed`
+            : 'Fetching data failed',
+            cause);
+    }
+}