v4.js 676 B

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  1. import native from './native.js';
  2. import rng from './rng.js';
  3. import { unsafeStringify } from './stringify.js';
  4. function v4(options, buf, offset) {
  5. if (native.randomUUID && !buf && !options) {
  6. return native.randomUUID();
  7. }
  8. options = options || {};
  9. var rnds = options.random || (options.rng || rng)();
  10. // Per 4.4, set bits for version and `clock_seq_hi_and_reserved`
  11. rnds[6] = rnds[6] & 0x0f | 0x40;
  12. rnds[8] = rnds[8] & 0x3f | 0x80;
  13. // Copy bytes to buffer, if provided
  14. if (buf) {
  15. offset = offset || 0;
  16. for (var i = 0; i < 16; ++i) {
  17. buf[offset + i] = rnds[i];
  18. }
  19. return buf;
  20. }
  21. return unsafeStringify(rnds);
  22. }
  23. export default v4;