/**
 * Coverage liveness for the scoped native watcher.
 *
 * OS watches follow inodes (Linux inotify) or can go silent after a path is
 * replaced (macOS FSEvents). `reconcileCoverage` only runs when the kernel
 * delivers a rename. If the HQ root — or a watched folder — is moved or
 * swapped with no event, `watched-paths` stays stable while the tree is gone.
 * A periodic identity probe is the only way to notice that.
 */
export type WatchCoverageFailureReason = "root-missing" | "root-replaced" | "watch-stale";
export type WatchCoverageProbeResult = {
    ok: true;
} | {
    ok: false;
    reason: WatchCoverageFailureReason;
    staleWatches: number;
};
export declare function directoryIdentityAt(absolutePath: string): string | undefined;
export declare function probeScopedWatchCoverage(input: {
    root: string;
    identities: Iterable<readonly [string, string]>;
    directoryIdentity: (absolutePath: string) => string | undefined;
}): WatchCoverageProbeResult;
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