refactor: move things to core, imports not fixed yet

src/core/structures/wrapper.ts

@@ -0,0 +1,16 @@
+import type { Dependencies } from '../../types/handler';
+
+/**
+ * @since 1.0.0
+ * An object to be passed into Sern#init() function.
+ * @typedef {object} Wrapper
+ */
+interface Wrapper {
+    readonly defaultPrefix?: string;
+    readonly commands: string;
+    readonly events?: string;
+    readonly containerConfig: {
+        get: (...keys: (keyof Dependencies)[]) => unknown[];
+    };
+}
+export default Wrapper;