refactor: add typeScript support to enforce valid translation keys (#6776)

src/utility-types.ts

@@ -50,3 +50,7 @@ export type ExtractSetType<T extends Set<any>> = T extends Set<infer U>
 
 export type SameType<T, U> = T extends U ? (U extends T ? true : false) : false;
 export type Assert<T extends true> = T;
+
+export type NestedKeyOf<T, K = keyof T> = K extends keyof T & (string | number)
+  ? `${K}` | (T[K] extends object ? `${K}.${NestedKeyOf<T[K]>}` : never)
+  : never;