export type ConditionFn<T = any> = (subject: T) => boolean;
export interface Rule<A extends string = string, S extends string = string, T = any> {
    action: A;
    subject: S;
    condition?: ConditionFn<T>;
}
export declare class Ability<A extends string = string, S extends string = string> {
    private rules;
    constructor();
    can<T>(action: A, subject: S, object?: T): boolean;
    allow<T>(action: A, subject: S, condition?: ConditionFn<T>): void;
    deny(action: A, subject: S): void;
    getRules(): Rule<A, S>[];
    clear(): void;
}