import { AssetId, InstrumentSlotId } from "../interfaces";
export declare function groupByKey<T, S = string>(items: T[], keyGetter: (o: T) => S): Map<S, T[]>;
export declare function getSlotId(assetIds: AssetId[], assetId: AssetId): InstrumentSlotId;
export declare function peekItem<T>(items: T[], offset?: number, last?: boolean): T | undefined;
export declare function takeByKey<T>(items: T[], keyGetter: (o: T) => string, keys: string[]): {
    result: T[];
    remaining: T[];
};
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