import type { DeliverHookPayload, DeliverPayload } from "#channel/types.js";
import type { DurableSessionState } from "#execution/durable-session-store.js";
import type { SessionCommandInbox } from "#execution/session-command-inbox.js";
/** What the parked driver should do with the next session activity. */
export type NextTurnInstruction = {
    readonly kind: "clear";
} | {
    readonly kind: "compact";
} | {
    readonly kind: "expired";
} | {
    readonly kind: "reset";
} | {
    readonly kind: "closed";
} | {
    readonly kind: "cancel-turn";
} | {
    readonly kind: "turn";
    readonly deliver: DeliverHookPayload;
    readonly remainder: DeliverPayload;
};
/**
 * Awaits the next delivery that requires driver action while the session
 * is parked. Deliveries fully routed to a descendant leave the parent with
 * no turn to run, so this keeps waiting until a delivery produces a parent
 * turn, a cancellation, expiry, or hook closure. The wait is unbounded by
 * design: a parked session lives until something addresses it.
 */
export declare function nextTurnDelivery(input: {
    readonly bufferedDeliveries: DeliverHookPayload[];
    readonly bufferedSessionControls: Array<"clear" | "compact" | "expired" | "reset">;
    readonly commandInbox: SessionCommandInbox;
    readonly driverWritable: WritableStream<Uint8Array>;
    readonly sessionState: DurableSessionState;
}): Promise<NextTurnInstruction>;