/** A running watch over one or more config files; call stop() to release it. */
export interface ConfigFileWatchHandle {
    stop(): void;
}
/**
 * Watch each path for content changes (mtime, size, or existence), invoking
 * `onChange` once per poll in which at least one watched path changed.
 * Duplicate paths are watched once.
 */
export declare function watchConfigFiles(paths: readonly string[], onChange: () => void, intervalMs?: number): ConfigFileWatchHandle;
/** Injectable dependencies for reloadAndNotifyChanges (ConfigManager provides these). */
export interface ReloadDeps {
    readonly listenerKeys: Iterable<string>;
    readonly get: (key: string) => unknown;
    readonly load: () => void;
    readonly notify: (key: string, oldValue: unknown, newValue: unknown) => void;
}
/**
 * Snapshot every subscribed key, reload from disk, then fire `notify` for each
 * key whose value actually changed, so an in-process set() that already
 * notified does not double-fire (its value is unchanged on reload), and an
 * external edit reaches subscribers exactly once. A failed reload keeps the
 * in-memory config and notifies nobody.
 */
export declare function reloadAndNotifyChanges(deps: ReloadDeps): void;
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