/**
 * UUID version 7 (RFC 9562 §5.7): a 48-bit Unix millisecond timestamp, then
 * randomness, so ids sort by creation time as plain strings.
 *
 * Every `generate*Id` mints through here. A session log names its records,
 * turns and child sessions by these ids, and a directory listing or an index
 * ordered by id is then ordered by time with no second column.
 *
 * **Monotonic within one process.** RFC 9562 §6.2 method 3: inside one
 * millisecond, or when the wall clock steps backwards, the 42 bits after the
 * version are treated as a counter and incremented, so every id this
 * generator returns sorts strictly after the one before it. When that counter
 * would overflow, the timestamp field advances by one millisecond rather than
 * wrapping. The 32 bits after the counter stay random on every call, which is
 * what keeps two processes minting in the same millisecond apart.
 *
 * Layout (hex digits): `tttttttt-tttt-7ccc-Vccc-cccrrrrrrrr`, where `t` is
 * the timestamp, `c` the 42-bit counter (12 bits in `rand_a`, 30 at the top of
 * `rand_b`), `V` the RFC variant nibble `8`–`b`, and `r` fresh randomness.
 */
export interface UuidV7Source {
    /** Current time in Unix milliseconds. */
    readonly now?: () => number;
    /** Fills the buffer with cryptographically strong random bytes. */
    readonly random?: (bytes: Uint8Array) => void;
}
/** A generator with its own monotonic state. Tests inject the clock and the randomness. */
export declare function createUuidV7Generator(source?: UuidV7Source): () => string;
/** The process-wide generator every id factory shares. */
export declare const uuidv7: () => string;
/** The Unix millisecond timestamp a UUIDv7 carries, or `undefined` for any other spelling. */
export declare function uuidv7Timestamp(value: string): number | undefined;
//# sourceMappingURL=uuidv7.d.ts.map