03./01. (πŸ’ͺ)

Preserve Literals

Preserve Literals
Preserve Literals
πŸ‘¨β€πŸ’Ό We store role permissions in a configuration object. Without as const, TypeScript widens the booleans to boolean, which loses useful information.
🐨 Open
index.ts
and:
  1. Add as const to the roles object so roles.admin.canDeleteUsers stays the literal type true
  2. Create a Role type from the keys of roles
  3. Remove the @ts-expect-error once adminCanDelete: true type-checks
  4. Implement canDeleteUsers(role: Role): boolean using the roles data (admin β†’ true, editor/viewer β†’ false)
  5. Export roles, adminCanDelete, and canDeleteUsers by name

Completion criteria

  • Named exports: roles, adminCanDelete, canDeleteUsers
  • canDeleteUsers('admin') is true; 'editor' and 'viewer' are false
  • With as const, adminCanDelete can be annotated as the literal true
πŸ’° as const preserves true and false as literal types, not just boolean.
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