Preserve Literals

👨‍💼 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:

Add as const to the roles object so roles.admin.canDeleteUsers stays the literal type true
Create a Role type from the keys of roles
Remove the @ts-expect-error once adminCanDelete: true type-checks
Implement canDeleteUsers(role: Role): boolean using the roles data (admin → true, editor/viewer → false)
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

💰 as const preserves true and false as literal types, not just boolean.

📜 TypeScript Handbook - Literal Types

03. Literal Types/01. Preserve Literals (💪 problem)

Preserve Literals

Completion criteria