export type UidSet = {
    study: string;
    series: string;
    sop: string;
};
export declare function hashUid(salt: string, key: string): string;
export declare function seedToSalt(seed: number | undefined): string | undefined;
export declare const PARAMETRIC_STREAM_OFFSET = 2246822507;
export declare function seededStream(seed: number, offset: number): () => number;
export type GroupUidGenerator = {
    study: (studyIndex: number) => string;
    series: (studyIndex: number, seriesIndex: number) => string;
};
export declare function makeGroupUidGenerator(salt?: string): GroupUidGenerator;
export type UidGenerator = (fileIndex: number) => UidSet;
export declare function makeUidGenerator(salt?: string): UidGenerator;