import { PiContextUsage } from "../types.js";
import { SessionEntry } from "@earendil-works/pi-coding-agent";
//#region src/node/contextUsage.d.ts
/**
 * Context usage for a thread, computed purely from persisted data. Returns
 * `undefined` when usage can't be known (no model / no context window).
 */
export declare const deriveContextUsage: (contextWindow: number, branch: readonly SessionEntry[], messages: readonly unknown[]) => PiContextUsage | undefined;
//#endregion
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