/**
 * The single statement of the rule that decides an exhausted failure's
 * terminal status.
 *
 * Previously each terminal-failure write site restated the rule and only two
 * of them implemented it, so `control.optional` meant different things per
 * node kind. Every such site now routes through here.
 *
 * @docLink packages/flow-engine/concepts#optional-failure
 */
import type { FlowNode } from "./types.js";
/**
 * Terminal status for a node whose execution failed with no retry budget left.
 *
 * Invariant: an optional node never ends terminally `failed`. Only `complete`
 * and `skipped` satisfy a hard `flow` edge (see `isBlocking`), so leaving one
 * `failed` stalls every dependent at the node the author called expendable.
 *
 * A router is the deliberate exception: a `skipped` router leaves the gated
 * set (`unsettledRouterBranchIds`) while satisfying every outgoing hard edge,
 * so skipping it admits *all* of its branches instead of selecting one.
 */
export declare function resolveTerminalFailureStatus(node: FlowNode): "failed" | "skipped";
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