/**
 * A stateful {@link Specification} that passes when the value of the data item
 * a changes. This specification will never pass on the first data item tested.
 * Each invocation compares the previous data item to the current data item,
 * which means the specification can only pass on the second (or subsequent)
 * invocation.
 *
 * @public
 * @extends {Specification}
 */
export default class Changes extends Specification {
    /**
     * @protected
     * @override
     * @param {*} data
     * @returns {boolean}
     */
    protected override _evaluate(data: any): boolean;
    #private;
}
import Specification from './Specification.js';