export interface RequiredElementOptions {
    required?: boolean;
}
/**
 * Decorator function that marks a property as required within an element parser.
 * It ensures that the property is defined and throws an error if the property is already associated with another element parser.
 *
 * @param {RequiredElementOptions} options - Configuration options for the required element, defaulting to `{ required: true }`.
 * This allows customization of the requirement behavior, although currently only supports the `required` flag.
 *
 * @returns {Function} A decorator function that takes a target object and a property key, and applies the required configuration.
 *
 * @throws {Error} Throws an error if the property is already associated with an element parser, indicating incorrect decorator order.
 *
 * @example
 * ```typescript
 * class Example {
 * @ElementRequired()
 * @ElementTextContent()
 * public title: string;
 * }
 * ```
 * In this example, the `title` property of the `Example` class is marked as required and associated with text content from an element.
 * The `@ElementRequired` decorator must be used after any `@Element...` decorators to ensure proper metadata registration.
 */
export declare function ElementRequired(options?: RequiredElementOptions): (target: any, propertyKey: string) => void;
export declare class RequiredElementMixin {
    readonly options: any;
    get required(): boolean;
}