export declare type Nullable<T> = T | undefined | null;
export declare type Guard<T> = (x: unknown) => x is T;
export interface GuardFunction<T> {
    (x: unknown): T;
}
export interface GuardFunctionWithArray<T> extends GuardFunction<T> {
    array: GuardFunction<Array<T>>;
    arrayNotEmpty: GuardFunction<Array<T>>;
}
export interface OptionalGuardFunctionWithArray<T> extends GuardFunction<Nullable<T>> {
    array: GuardFunction<Nullable<Array<T>>>;
}
export interface GuardClass<T> {
    optional: OptionalGuardFunctionWithArray<T>;
    required: GuardFunctionWithArray<T>;
}