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| import rng from './rng.js'; | |
| import { unsafeStringify } from './stringify.js'; | |
| function v4(options, buf, offset) { | |
| if (!buf && !options && crypto.randomUUID) { | |
| return crypto.randomUUID(); | |
| } | |
| return _v4(options, buf, offset); | |
| } | |
| function _v4(options, buf, offset) { | |
| 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; | |