import { DataFrame } from "./DataFrame";
import { FragmentFrame } from "./FragmentFrame";
import { GroupProps, DimensionValue } from "./types";
export declare class GroupFrame<Name extends string = string> {
    private readonly prop;
    private readonly origin;
    private rowIndex;
    private unique;
    private groups;
    constructor(origin: DataFrame<Name> | FragmentFrame<Name>, prop: GroupProps<Name>);
    getCursor(column: Name): import("./types").ColumnCursor<Name, any>;
    ungroup(): DataFrame<Name> | FragmentFrame<Name>;
    map<A>(callback: (row: FragmentFrame<Name>, index: number) => A): Array<A>;
    uniqueValues(): DimensionValue[][];
    private buildIndex;
}
export declare const isGroupFrame: (x: any) => x is GroupFrame<string>;
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