export type WatchGrewFn = (jsonlPath: string, timeoutMs: number) => Promise<boolean>;
export type FindJsonlFn = (sessionId: string) => string | null;
export declare function findJsonlForSessionId(sessionId: string, env?: NodeJS.ProcessEnv): string | null;
/**
 * Watch `jsonlPath` for any byte growth within `timeoutMs` ms.
 * Returns true if the file grew before the deadline, false otherwise.
 * Returns false immediately if the file cannot be statted.
 */
export declare function watchForGrowth(jsonlPath: string, timeoutMs: number): Promise<boolean>;
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