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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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