/**
 * ### IsBoolean Rule
 *
 * Validates that the field under validation can be cast as a Boolean.
 * This rule accepts true, false, 1, 0, "1", and "0" as valid Boolean values.
 *
 * #### Valid boolean Values
 * - `true` and `false` (Boolean)
 * - `1` and `0` (number)
 * - `"1"` and `"0"` (string)
 * - `"true"` and `"false"` (case-insensitive string)
 *
 * @example
 * ```typescript
 * // With class validation
 * class UserPreferences {
 *   @IsBoolean
 *   emailNotifications: Boolean;
 *
 *   @IsBoolean
 *   darkMode: string; // Can be "true"/"false"
 * }
 * ```
 *
 * @param options - Validation options containing value and context
 * @returns Promise resolving to true if valid, rejecting with error message if invalid
 *
 * @since 1.22.0
 * @public
 */
export declare const IsBoolean: PropertyDecorator;
declare module "../types" {
    interface IValidatorRules {
        /**
         * ### Boolean Rule
         *
         * Validates that the field under validation can be cast as a Boolean.
         * This rule accepts true, false, 1, 0, "1", and "0" as valid Boolean values.
         *
         * #### Valid boolean Values
         * - `true` and `false` (Boolean)
         * - `1` and `0` (number)
         * - `"1"` and `"0"` (string)
         * - `"true"` and `"false"` (case-insensitive string)
         *
         * @example
         * ```typescript
         * // Valid boolean values
         * await Validator.validate({
         *   value: true,
         *   rules: ['Boolean']
         * }); // ✓ Valid
         *
         * await Validator.validate({
         *   value: 0,
         *   rules: ['Boolean']
         * }); // ✓ Valid
         *
         * await Validator.validate({
         *   value: 'false',
         *   rules: ['Boolean']
         * }); // ✓ Valid
         *
         * // Invalid values
         * await Validator.validate({
         *   value: 'maybe',
         *   rules: ['Boolean']
         * }); // ✗ Invalid
         *
         * // With class validation
         * ```
         *
         * @param options - Validation options containing value and context
         * @returns Promise resolving to true if valid, rejecting with error message if invalid
         *
         * @since 1.22.0
         * @public
         */
        Boolean: IValidatorRuleFunction;
    }
}