Adds new Mutable type

Author: eamodio

src/@types/global.d.ts

@@ -6,6 +6,7 @@ export declare global {
 	export type PickPartialDeep<T, K extends keyof T> = Omit<Partial<T>, K> & { [P in K]?: Partial<T[P]> };
 
 	export type Mutable<T> = { -readonly [P in keyof T]: T[P] };
+	export type MutableDeep<T> = { -readonly [P in keyof T]: MutableDeep<T[P]> };
 	export type PickMutable<T, K extends keyof T> = Omit<T, K> & { -readonly [P in K]: T[P] };
 
 	export type EntriesType<T> = T extends Record<infer K, infer V> ? [K, V] : never;