import type { Tagged } from "type-fest";
/**
 * An ArrayBuffer known to be 16 bytes, for holding UUID data.
 */
export type UUIDBuffer = Tagged<ArrayBuffer, "FixedLengthArrayBuffer", {
    length: 16;
}>;
export declare function makeUUIDBuffer(): UUIDBuffer;
export type UUID = Tagged<string, "UUID">;
export type UUIDV4 = Tagged<UUID, "UUIDV4">;
export type UUIDV8 = Tagged<UUID, "UUIDV8">;
export declare function isUUIDV8(id: string): id is UUIDV8;
/**
 * MODIFIES THE GIVEN BUFFER IN PLACE.
 *
 * Adds the version and variant bits at the place that the uuid spec mandates.
 * In the process, it shifts subsequent bits to the right, which means that the
 * last 6 bits of the buffer are discarded (so these should be data you don't
 * care about).
 */
export declare function interposeVersionAndVariant(buf: UUIDBuffer): UUIDBuffer;
export declare function assertUnreachable(it: never, errorMessage?: string): never;
/**
 * Creates a type representing a string where some set of allowed characters
 * repeat N times. Requires full padding to make all the strings N chars long.
 */
export type RepeatedString<Len extends number, LegalChars extends string, Arr extends LegalChars[] = []> = Arr["length"] extends Len ? ArrayJoin<Arr> : RepeatedString<Len, LegalChars, [...Arr, LegalChars]>;
type ArrayJoin<Arr extends string[]> = Arr extends [
    infer First extends string,
    ...infer Rest extends string[]
] ? `${First}${ArrayJoin<Rest>}` : "";
export {};
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