import type { RuntimeExecutionId } from "./types.js";
export declare const ACTIVE_RUNTIME_TTL_MS: number;
export interface ActiveRuntimeRecord {
    runtime: RuntimeExecutionId;
    updatedAt: string;
    writer: "hook" | "cli" | string;
}
export interface ActiveRuntimeReadResult {
    record?: ActiveRuntimeRecord;
    status: "missing" | "stale" | "fresh" | "corrupted";
}
export declare function activeRuntimePath(root: string): string;
export declare function isActiveRuntimeFresh(record: ActiveRuntimeRecord, now?: number, ttlMs?: number): boolean;
export declare function readActiveRuntime(root: string, now?: number, ttlMs?: number): Promise<ActiveRuntimeReadResult>;
export declare function writeActiveRuntime(root: string, runtime: RuntimeExecutionId, options?: {
    writer?: string;
    now?: number;
}): Promise<ActiveRuntimeRecord>;