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v4.js
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v4.js
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import { randomUUID } from 'crypto';
import rng from './rng.js';
import stringify from './stringify.js';
const random = randomUUID
? function () {
const hexString = randomUUID().replaceAll('-', '');
return Uint8Array.from(Buffer.from(hexString, 'hex'));
}
: rng;
function v4(options, buf, offset) {
options = options || {};
const rnds = options.random || (options.rng || random)();
// Per 4.4, set bits for version and `clock_seq_hi_and_reserved`
rnds[6] = (rnds[6] & 0x0f) | 0x40;
rnds[8] = (rnds[8] & 0x3f) | 0x80;
// Copy bytes to buffer, if provided
if (buf) {
offset = offset || 0;
for (let i = 0; i < 16; ++i) {
buf[offset + i] = rnds[i];
}
return buf;
}
return stringify(rnds);
}
export default v4;