v4.js 1.0 KB

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  1. "use strict";
  2. Object.defineProperty(exports, "__esModule", { value: true });
  3. const native_js_1 = require("./native.js");
  4. const rng_js_1 = require("./rng.js");
  5. const stringify_js_1 = require("./stringify.js");
  6. function v4(options, buf, offset) {
  7. if (native_js_1.default.randomUUID && !buf && !options) {
  8. return native_js_1.default.randomUUID();
  9. }
  10. options = options || {};
  11. const rnds = options.random ?? options.rng?.() ?? (0, rng_js_1.default)();
  12. if (rnds.length < 16) {
  13. throw new Error('Random bytes length must be >= 16');
  14. }
  15. rnds[6] = (rnds[6] & 0x0f) | 0x40;
  16. rnds[8] = (rnds[8] & 0x3f) | 0x80;
  17. if (buf) {
  18. offset = offset || 0;
  19. if (offset < 0 || offset + 16 > buf.length) {
  20. throw new RangeError(`UUID byte range ${offset}:${offset + 15} is out of buffer bounds`);
  21. }
  22. for (let i = 0; i < 16; ++i) {
  23. buf[offset + i] = rnds[i];
  24. }
  25. return buf;
  26. }
  27. return (0, stringify_js_1.unsafeStringify)(rnds);
  28. }
  29. exports.default = v4;