/** Marks a value that was cut, so a reader can tell a truncated one from a complete one. */
export declare const TRUNCATION_MARK = "\u2026";
/**
 * Cuts a string that would overrun a byte budget, marking the cut. What comes back is at most `budgetBytes`
 * long, the mark included.
 *
 * Cuts between code points rather than between bytes, so a multi-byte character is never left in halves.
 * Graphemes are left unconsidered, which can separate an emoji from a modifier following it -- a cost paid
 * only at a budget no caller here comes near.
 *
 * A budget too small to hold the mark yields nothing at all, rather than a return that overruns what the
 * caller asked for.
 */
export declare function clampToBytes(value: string, budgetBytes: number): string;