Scaffold ESM TypeScript rewrite as @larvit/smpp

src/result.ts

@@ -0,0 +1,9 @@
+/**
+ * Either a failure carrying err, or a success carrying T. Both branches declare every key, so
+ * callers can destructure once and let `if (err)` narrow what is left.
+ */
+export type Result<T> =
+	| ({ err: Error } & Partial<Record<keyof T, undefined>>)
+	| ({ err?: undefined } & T);
+
+export type VoidResult = { err?: Error };