/**
 * Chronological ordering for chat messages.
 *
 * The server orders by `(created_at, id)`. The widget store must match
 * that contract whenever messages are inserted out of band (streaming
 * races, Ably echoes) so bubbles don't land in append order.
 */
import type { ChatMessage } from "../../../utils/globals";
/** Compare two messages the way Postgres orders inbox rows. */
export declare function compareMessagesChronologically(a: ChatMessage, b: ChatMessage): number;
export declare function sortMessagesChronologically(messages: ChatMessage[]): ChatMessage[];
export declare function insertMessageChronologically(messages: ChatMessage[], incoming: ChatMessage): ChatMessage[];