import type { IPolicy } from './policy';
export declare const LITERAL_STRING_KEY = "LiteralString";
/**
 * Helper class that maintains the set of attached policies for a principal.
 */
export declare class AttachedPolicies {
    private policies;
    /**
     * Adds a policy to the list of attached policies.
     *
     * If this policy is already, attached, returns false.
     * If there is another policy attached with the same name, throws an exception.
     */
    attach(policy: IPolicy): void;
}