/**
 * media.ts — The download cache under `~/.pi/wechat/media`.
 *
 * Both processes touch it: the worker sweeps it at startup and hourly, and
 * the extension reports on it (`/wechat media`) and empties it
 * (`/wechat clean`). Those were separate implementations that disagreed
 * about what "old" means — one deleted files over 24 h, the other deleted
 * everything without asking.
 *
 * Not pure, but self-contained and testable against a temp directory, the
 * way `log.ts` is. `nowMs` is a parameter rather than a clock read so the
 * age arithmetic can be tested without waiting a day. No relative imports,
 * so it loads under node's native type stripper.
 */
/** How long a download is worth keeping. Both processes must agree. */
export declare const MEDIA_MAX_AGE_MS: number;
export interface MediaSurvey {
    count: number;
    totalSize: number;
    /** How many are older than the age handed in. */
    old: number;
}
/**
 * Count and measure the cache, or null when there is no directory.
 *
 * Files that cannot be stat'd are counted but contribute no size: a listing
 * is a report, and refusing to produce one because of a single unreadable
 * entry would be worse than a slightly low total.
 */
export declare function surveyMedia(dir: string, oldAgeMs: number, nowMs: number): MediaSurvey | null;
/**
 * Delete cached downloads, keeping anything younger than `minAgeMs`.
 *
 * `minAgeMs = 0` removes everything — the `/wechat clean` case, which is why
 * that call site confirms first: these files are what the `[Image: …]` paths
 * already handed to the agent point at.
 *
 * Never throws: this runs from a worker timer where an exception would be an
 * unhandled rejection, and from a command where it would surface as a crash.
 */
export declare function sweepMedia(dir: string, minAgeMs: number, nowMs: number): number;
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