export interface ProgressCheckResult {
    alive: boolean;
    reasons: string[];
    backgroundTaskCount: number;
}
export interface ProgressCheckOptions {
    pid: number;
    cliHomeDir?: string | null;
    cwd?: string | null;
    freshMs: number;
}
export declare function encodeProjectDirName(cwd: string): string;
export declare function newestMtimeUnder(rootDir: string | null | undefined, { maxEntries, maxDepth }?: {
    maxEntries?: number;
    maxDepth?: number;
}): Promise<number | null>;
export declare function checkSessionProgress(opts: ProgressCheckOptions, lastOutputAtMs: number | null | undefined): Promise<ProgressCheckResult>;