/**
 * Async directive rendering utilities for server-side rendering.
 *
 * @packageDocumentation
 */
import { Directive, Expression, FallbackOption } from '../types.js';
import { ContextKey } from '../context-registry.js';
/**
 * A pending stream chunk for async directives in stream mode.
 * Used by renderStream() to emit replacement scripts after initial HTML.
 *
 * @internal
 */
export interface StreamPendingChunk {
    asyncId: string;
    el: Element;
    fn: Directive;
    options: {
        template?: FallbackOption;
        [key: string]: unknown;
    };
    scopeState: Record<string, unknown>;
    rootState: Record<string, unknown>;
    expr: Expression;
    using?: ContextKey<unknown>[];
}
/**
 * Get the nesting depth of an async directive by walking up the DOM.
 *
 * @internal
 */
export declare function getAsyncDepth(el: Element, depthMap: WeakMap<Element, number>): number;
/**
 * Render fallback content for an async directive.
 *
 * @internal
 */
export declare function renderFallback(el: Element, fallback: FallbackOption, options: {
    template?: unknown;
    [key: string]: unknown;
}, ssrMode: string, streamCtx?: {
    fn: Directive;
    scopeState: Record<string, unknown>;
    rootState: Record<string, unknown>;
    expr: Expression;
    using?: ContextKey<unknown>[];
    streamPending: StreamPendingChunk[];
}): Promise<void>;