import { Config, CustomAttributeTypeInterface, ValidationError } from '../types';
/**
 * Conditional attribute type for Markdoc {% if /%} and {% else /%} tags.
 *
 * Acceptable values are:
 * - `boolean` (true or false)
 * - `null` or `undefined` (in case of using variable that's not defined)
 * - `object`
 */
export declare class ConditionalAttributeType implements CustomAttributeTypeInterface {
    validate(value: any, _config: Config, key: string): ValidationError[];
}
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