/**
 * @license
 * Copyright 2026 Steven Roussey <sroussey@gmail.com>
 * SPDX-License-Identifier: Apache-2.0
 */
import type { TaskGraph } from "@workglow/task-graph";
/**
 * Run-total usage line for a graph footer. Costs are summed per model (a blend
 * across rate cards would mis-price), and a missing rate on any contributing
 * model marks the figure partial (`~`).
 *
 * Tokens and cost only — the footer draws the run's wall-clock in its own
 * column, and a duration living inside the spend field made the two widest,
 * fastest-changing numbers on the line share one edge.
 */
export declare function useGraphUsageLine(graph: TaskGraph): string;