import type { GroupByOpts } from "../api.js";
/**
 * Shared helper function for `groupBy*` reducers
 *
 * @param opts -
 *
 * @internal
 */
export declare const __groupByOpts: <SRC, KEY, GROUP>(opts?: Partial<GroupByOpts<SRC, PropertyKey, GROUP>>) => GroupByOpts<SRC, KEY, GROUP>;
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