import type { DeliverPayload, SessionAuthContext } from "#channel/types.js";
import type { DurableSessionState } from "#execution/durable-session-store.js";
/**
 * Coalesces inbound deliver payloads and routes any descendant-bound input
 * responses down to the owning child, returning the parent-local remainder
 * (or `undefined` when the whole payload routed away).
 *
 * Short-circuits via `hasProxyInputRequests` so the common no-active-descendant
 * path skips a durable step boundary. Lives in its own non-step module so both
 * the driver and the active turn can share it (a `"use step"` module cannot
 * re-export plain helpers into a workflow body).
 */
export declare function routeDeliverToChildren(input: {
    readonly auth?: SessionAuthContext | null;
    readonly parentWritable: WritableStream<Uint8Array>;
    readonly payloads: readonly DeliverPayload[];
    readonly sessionState: DurableSessionState;
}): Promise<DeliverPayload | undefined>;