/**
 * Activity runtime helpers shared by every Op activity implementation, wherever
 * it lives — the base activities in the temporal lexicon and the cloud-specific
 * appliers relocated into the aws/gcp/azure lexicons. Hosting them in core keeps
 * a cloud lexicon from having to depend on the temporal lexicon just to
 * heartbeat or sleep.
 */
/**
 * Emit an activity heartbeat if running under a Temporal worker; otherwise no-op.
 *
 * The first call kicks off a one-time lazy load of `@temporalio/activity` and
 * returns immediately; once resolved, subsequent calls heartbeat. Heartbeats
 * are periodic (every ~15s, well inside the 60s heartbeat timeout), so the
 * single missed first tick is harmless. Under chant's local executor (no
 * Temporal SDK present) it no-ops, and the module imports cleanly without the SDK.
 */
export declare function safeHeartbeat(details?: unknown): void;
/**
 * Sleep for `ms`, rejecting early if `signal` aborts. Polling activities use
 * this between attempts so a local-executor timeout or Ctrl-C interrupts the
 * wait instead of running it to completion.
 */
export declare function sleep(ms: number, signal?: AbortSignal): Promise<void>;
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