@fullstory/react-native/lib/module/utils.js

The official FullStory React Native plugin

/* eslint-disable no-bitwise */
export const generateUUID = function () {
  function hex8(n) {
    return ((n >>> 0) + 4294967296).toString(16).substring(1).toUpperCase();
  }

  // state (a is always initialized to odd value, so state is never 0)
  var a = Math.random() * 4294967296 | 1,
    b = Math.random() * 4294967296 | 0,
    c = Date.now() / 4294967296 ^ Math.random() * 4294967296,
    d = Date.now() ^ Math.random() * 4294967296;

  // four applications of xorshift128
  var f = function () {
    var t = d | 0;
    t ^= t << 11;
    t ^= t >>> 8;
    d = t ^ a ^ a >>> 19;
    t = c | 0;
    t ^= t << 11;
    t ^= t >>> 8;
    c = t ^ d ^ d >>> 19;
    t = b | 0;
    t ^= t << 11;
    t ^= t >>> 8;
    b = t ^ c ^ c >>> 19;
    t = a | 0;
    t ^= t << 11;
    t ^= t >>> 8;
    a = t ^ b ^ b >>> 19;
    return hex8(a) + '-' + hex8(b).substring(0, 4) + '-' + hex8(b).substring(4) + '-' + hex8(c).substring(0, 4) + '-' + hex8(c).substring(4) + hex8(d);
  };

  // mix initial state - not strictly necessary
  f();
  f();
  f();
  f();
  return f;
}();
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