helpertypes

import type { PartialDeep, RequiredDeep, ObjectLookupString } from 'helpertypes'; interface UserProfile { id: string; name: string; settings: { theme: 'dark' | 'light'; notifications: boolean; }; tags?: string[]; } // Create a deeply partial version of UserProfile type PartialUserProfile = PartialDeep<UserProfile>; const partialUser: PartialUserProfile = { id: 'abc-123', settings: { theme: 'dark' } // Only define some nested properties }; console.log(partialUser); // Create a deeply required version, making all optional properties required (if possible) type FullyRequiredUserProfile = RequiredDeep<UserProfile>; const fullUser: FullyRequiredUserProfile = { id: 'def-456', name: 'Jane Doe', settings: { theme: 'light', notifications: true }, tags: [] // 'tags' is now required }; console.log(fullUser); interface NestedObject { a: { b: { c: string } }; d: number; } // Look up a string path in a nested object type type PathA_B_C = ObjectLookupString<NestedObject, 'a.b.c'>; // Expected: string type PathD = ObjectLookupString<NestedObject, 'd'>; // Expected: number // Type checking for example usage (won't run in JS) const val1: PathA_B_C = 'hello'; // @ts-expect-error - Type 'number' is not assignable to type 'string'. const val2: PathA_B_C = 123; console.log('Demonstrating type utilities. Check TypeScript compiler for full effect.');