import type { Heartbeat } from "./types.js";
/**
 * Push one heartbeat tick into its owning session through the durable session
 * outbox — the same path parent callbacks use, so heartbeats inherit its retry,
 * dead-lettering and once-only semantics rather than adding a second way to put
 * text into a session.
 *
 * `sourceId` + `sourceAttempt` key the outbox's composite identity index on
 * (heartbeat, fire number), so a tick re-attempted after a failed delivery is a
 * no-op instead of a duplicate wake.
 *
 * The engine-facing `message` is the stored text with nothing composed around
 * it: a heartbeat says what its session told it to say. Only the human-facing
 * banner is clipped, exactly as parent callbacks do.
 */
export declare function deliverHeartbeat(heartbeat: Heartbeat, fireCount: number): void;
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