import { BaseXMLUIParser } from './BaseXMLUIParser.js';
import type { Widget } from '../widgets/Widget.js';
import type { XMLUIParserContext } from './XMLUIParserContext.js';
import type { LayerInit } from '../core/LayerInit.js';
/**
 * A layer parameter for a {@link WidgetXMLInputConfig}.
 *
 * @category XML
 */
export interface WidgetXMLInputConfigLayerParameter {
    mode: 'layer';
    name: string;
    optional?: boolean;
    list?: boolean;
    validator?: <W extends Widget>(value: LayerInit<Widget>) => LayerInit<W>;
}
/**
 * Deserializes an XML <layer> element, as a {@link LayerInit} value.
 *
 * @param parser - The parser that is calling this deserializer
 * @param context - The current parser context, shared with all other initializations
 * @param elem - The element to deserialize
 * @returns Returns a new LayerInit instance, to be used as a parameter
 *
 * @category XML
 */
export declare function deserializeLayerElement(parser: BaseXMLUIParser, context: XMLUIParserContext, elem: Element): LayerInit<Widget>;
/**
 * Deserializes an attribute with an options prefix. The value will be added as
 * a field in an options object, or completely replace the options object.
 *
 * @param parser - The parser that is calling this deserializer
 * @param context - The current parser context, shared with all other initializations
 * @param instantiationContext - The current parser context, only available to this instantiation
 * @param attribute - The attribute to deserialize - the attribute name decides the options object field, but `_` replaces the options object
 *
 * @category XML
 */
export declare function deserializeOptionsAttribute(parser: BaseXMLUIParser, context: XMLUIParserContext, instantiationContext: Record<string, unknown>, attribute: Attr): void;
/**
 * Deserializes an attribute with an event on/once prefix. The attribute will
 * decide which event listener to add to the instance post-initialization. The
 * listeners will be added to the instantiation context for later use.
 *
 * @param once - Should `once` be set to true in {@link Widget#on}?
 * @param parser - The parser that is calling this deserializer
 * @param context - The current parser context, shared with all other initializations
 * @param instantiationContext - The current parser context, only available to this instantiation
 * @param attribute - The attribute to deserialize - the attribute name decides the event type to listen to
 *
 * @category XML
 */
export declare function deserializeEventAttribute(once: boolean, parser: BaseXMLUIParser, context: XMLUIParserContext, instantiationContext: Record<string, unknown>, attribute: Attr): void;
/**
 * Adds an options object to the end of an argument list.
 *
 * @param _parser - The parser that is calling this deserializer (unused)
 * @param _context - The current parser context, shared with all other initializations (unused)
 * @param instantiationContext - The current parser context, only available to this instantiation
 * @param args - The argument list that will be modified
 *
 * @category XML
 */
export declare function addOptionsObjectToArguments(_parser: BaseXMLUIParser, _context: XMLUIParserContext, instantiationContext: Record<string, unknown>, args: Array<unknown>): void;
/**
 * Adds a list of event listeners to a widget instance. The event listeners will
 * be retrieved from the instantiation context.
 *
 * @param _parser - The parser that is calling this deserializer (unused)
 * @param _context - The current parser context, shared with all other initializations (unused)
 * @param instantiationContext - The current parser context, only available to this instantiation
 * @param instance - The widget instance for which the event listeners will be added to
 *
 * @category XML
 */
export declare function addEventListenersToWidget(_parser: BaseXMLUIParser, _context: XMLUIParserContext, instantiationContext: Record<string, unknown>, instance: Widget): void;
/**
 * An XML UI parser.
 *
 * Unlike {@link BaseXMLUIParser}:
 *
 * - All default widgets are pre-registered
 * - `<layer>` elements are treated as LayerInit parameters ("layer" parameter mode)
 * - Attribute values starting with a backslash are always treated as strings, with the backslash removed
 * - Attribute values starting with a dollar sign are always treated as variables
 * - Attribute values starting with an at sign are always treated as JSON-encoded values
 * - Attributes with the `lazy-widgets:options` namespace will be added to an options object and passed to a widget factory
 * - Attributes with the `lazy-widgets:on` namespace will add event listeners to a widget
 * - Similarly, attributes with the `lazy-widgets:once` namespace will add event listeners to a widget, but with `once` set to true
 * - A lot of built-in validators are pre-registered
 *
 * @category XML
 */
export declare class XMLUIParser extends BaseXMLUIParser {
    constructor();
}