/**
 * UTF-16 code-unit order — what `<` and `>` compare, and what
 * `Array.prototype.sort` gives with no comparator. It differs from true code
 * point order only for astral characters, and it is deliberately this order
 * rather than that one, so a producer agrees with any consumer that reorders
 * the same names with a bare `.sort()`.
 *
 * D90 R3(a) rules the locale dependence out at the root: `localeCompare`
 * follows the collation the process environment selects, so any list ordered
 * with it reorders when the machine's `LC_ALL` changes. Core orders two lists
 * this way — a Runtime Type's metadata entries, which decide a type identity
 * string, and the diagnostic tiebreaker, which decides what a reader sees
 * first — and neither may move with the environment.
 */
export declare function byCodeUnit(left: string, right: string): number;
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