export type TGuardFunction<T> = (dataArg: T) => Promise<boolean>;
export interface IGuardOptions {
    name?: string;
    failedHint?: string;
}
export declare class Guard<T> {
    private guardFunction;
    options: IGuardOptions;
    constructor(guardFunctionArg: TGuardFunction<T>, optionsArg?: IGuardOptions);
    /**
     * executes the guard against a data argument;
     * @param dataArg
     */
    exec(dataArg: T): Promise<boolean>;
    getFailedHint(dataArg: T): Promise<string>;
}