type AnyClass = { new(...args: any[]): any }
/**
/**
 * Simple User class with scopes
/**
 * Simple User class with scopes
 */
class User {
    id: string
    scope: Set<string>
    constructor(id: string, scopes: string[]) {
        this.id = id
        this.scope = new Set(scopes)
    }
}
/**
/**
 * A decorator which limits other class definitions to use the scope
/**
 * A decorator which limits other class definitions to use the scope
 */
function limitScope(...scopes: string[]) {
    return function<T extends AnyClass>(target: T): T {
        
        // Create a synthetic superclass
        return class extends target {
            constructor(...args: any[]) {
                super(...args)
                // Search constructor arguments for a User object
                const user = args.find((arg) => (arg instanceof User))
                if (user) {
                    // Check scopes and throw error
                    if (! scopes.every((scope) => user.scope.has(scope))) {
                        throw new Error('User does not have scope')
                    }
                }
                else if (scopes.length > 0)
                    throw new Error('No User provided to validate scopes')
            }
        } as T
    }
}
@limitScope('admin')
class Refund {
    constructor(createdBy: User) {
        console.log('Creating a refund')
    }
    
}
const admin = new User('admin_user_id', ['admin'])
const customer = new User('customer_id', ['user'])
const refund = new Refund(admin)