/**
 * Definition for class type reference.
 *
 * @since v0.6.0
 */
export type Instance<T, U extends any[] = any[]> = abstract new (...args: U) => T;
/**
 * Creates a type guard that returns true if a passed argument is an instance of a given `type`.
 *
 * @since v0.3.0
 */
export declare function isInstanceOf<T, U extends any[] = any[]>(type: Instance<T, U>): (value: unknown) => value is T;
/**
 * Creates a type guard that returns true if a passed argument is not an instance of a given `type`.
 *
 * @since v0.3.0
 */
export declare function isNotInstanceOf<T, U extends any[] = any[], V = unknown>(type: Instance<T, U>): (value: T | V) => value is V;