export declare class Bools {
    /**
     * Determines if a value is strictly a boolean `true` or `false`. Anything else
     * will result in the method returning `false`.
     *
     * Useful in cases where you have an optional boolean parameter that you need
     * to assign a default value to by determining if it had been set or not.
     *
     * @param val The value to be decided on whether it's strictly boolean `true`
     * or `false`.
     */
    static isBooleanStrict(val: unknown): boolean;
}