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- import native from './native.js';
- import rng from './rng.js';
- import { unsafeStringify } from './stringify.js';
- function v4(options, buf, offset) {
- if (native.randomUUID && !buf && !options) {
- return native.randomUUID();
- }
- options = options || {};
- const rnds = options.random ?? options.rng?.() ?? rng();
- if (rnds.length < 16) {
- throw new Error('Random bytes length must be >= 16');
- }
- rnds[6] = (rnds[6] & 0x0f) | 0x40;
- rnds[8] = (rnds[8] & 0x3f) | 0x80;
- if (buf) {
- offset = offset || 0;
- if (offset < 0 || offset + 16 > buf.length) {
- throw new RangeError(`UUID byte range ${offset}:${offset + 15} is out of buffer bounds`);
- }
- for (let i = 0; i < 16; ++i) {
- buf[offset + i] = rnds[i];
- }
- return buf;
- }
- return unsafeStringify(rnds);
- }
- export default v4;
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