import { Predicate, Context } from './predicate';
export declare class BooleanPredicate extends Predicate<boolean> {
    /**
     * @hidden
     */
    constructor(context?: Context<boolean>);
    /**
     * Test a boolean to be true.
     */
    readonly true: this;
    /**
     * Test a boolean to be false.
     */
    readonly false: this;
}