refactor/project structure

src/util/Validation.ts

@@ -0,0 +1,11 @@
+/**
+ * isDefined simply ensures a given input is not
+ * null, undefined, an empty string or NaN.
+ *
+ * @param n to validate
+ * @returns if this object exists (boolean)
+ */
+export default function isDefined<T>(n: T | null | undefined | "" | number): n is T
+{
+    return typeof n === "number" ? !isNaN(n) : n !== null && n !== undefined && n !== "";
+}