/**
 * Bytewise ordering helpers for semantic-set arrays. Identifiers, hashes, and
 * URNs in dapp-kit documents are ASCII, so UTF-16 code-unit order equals UTF-8
 * byte order and matches the JCS property order used for hashing.
 */
export declare function compareCodeUnits(left: string, right: string): number;
export declare function compareNumbers(left: number, right: number): number;
export interface SortedUniqueIssue {
    index: number;
    message: string;
}
/**
 * Reports the first position at which `values` stops being strictly ascending
 * under `compare`; equal neighbours are duplicates, descending neighbours are
 * unsorted. Returns `undefined` when the array is sorted and unique.
 */
export declare function findSortedUniqueIssue<T>(values: readonly T[], compare: (left: T, right: T) => number, subject: string): SortedUniqueIssue | undefined;
export declare function isSortedUniqueStrings(values: readonly string[]): boolean;
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