import type { Catalogs } from 'workspace-tools';
/**
 * Returns a `Catalogs` containing only the entries that were added or changed in `after`
 * relative to `before`. Removed entries (and removed named catalogs) are excluded.
 * Returns `undefined` if nothing was added or changed.
 *
 * (It's possible that newly-added catalog entries didn't actually change from their
 * prior versions, but it's better to be conservative and include them.)
 */
export declare function diffCatalogs(options: {
    before: Catalogs;
    after: Catalogs;
}): Catalogs | undefined;
//# sourceMappingURL=diffCatalogs.d.ts.map