/** A single task's freshness relative to the reference `now`. */
export interface TaskFreshness {
    /** The task id (e.g. `T1`) as recorded in `PROGRESS.json`. */
    taskId: string;
    /** The task's raw `updatedAt` ISO timestamp, unmodified. */
    updatedAt: string;
    /** `now - updatedAt` in milliseconds. Negative if `updatedAt` is in the future (clock skew). */
    ageMs: number;
}
export interface FreshnessResult {
    /** True when the freshest task's age is within `thresholdMs` (inclusive). */
    isFresh: boolean;
    /**
     * The least-stale task among all parseable entries, regardless of whether it
     * is within the threshold — `null` only when `tasks` is empty or every
     * `updatedAt` is unparseable. Callers decide what to do with a non-fresh
     * `freshest`; this function only reports facts.
     */
    freshest: TaskFreshness | null;
}
/**
 * Assess whether any task in `tasks` (task id → `updatedAt` ISO string) was
 * touched within `thresholdMs` of `now`. Entries with an unparseable
 * `updatedAt` are skipped rather than corrupting the result — this is a pure
 * fact-reporting function, not a validator, so it degrades quietly rather
 * than throwing on bad input.
 */
export declare function assessProgressFreshness(tasks: Readonly<Record<string, string>>, now: Date, thresholdMs: number): FreshnessResult;
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