Add Event Emitter

source/types.ts

@@ -0,0 +1,8 @@
+/**
+ * A deeply readonly type.
+ * @template T - The type to make deeply readonly.
+ * @returns The deeply readonly type.
+ */
+export type DeeplyReadonly<T> = {
+    readonly [K in keyof T]: T[K] extends (...args: never[]) => unknown ? T[K] : DeeplyReadonly<T[K]>;
+};