import type { WorkflowState } from '../types.ts';
import type { EngineInternals } from './internals.ts';
/**
 * The timestamp at which `state` becomes eligible for retention-driven
 * purge, or `null` when it is non-terminal, has no applicable retention
 * window, or (WFT-19 review round 2) its own pinned revision's retention
 * policy cannot be resolved on this process right now — an unresolvable pin
 * is NOT purge-eligible under the engine default; it is re-examined on a
 * later sweep once the pin becomes resolvable, rather than risking an
 * irreversible early purge against a shorter policy than the run's own.
 * Falls back to the resolved dynamic definition's own retention policy for a
 * `registerSource()`-registered type (see `resolveRetentionPolicyForState()`),
 * then the engine-wide default for any other type — mirroring `retention.ts`'s
 * `resolveWorkflowTypeRetention`.
 */
export declare function getWorkflowRetentionDeadline(internals: EngineInternals, state: WorkflowState): Promise<number | null>;