@react-query-builder-express/core/modules/utils/uuid.js

User-friendly query builder for React. Core

// Had to make uuid use a constant seed so it would generate same sequence across runs. This was needed
// so server side rendering and client side rendering yield same results (e.g. the uuid is used when rendering
// the concunctions with their name and id)
var query_builder_seed = 0;
export default () => {
  // Generate a random GUID http://stackoverflow.com/a/2117523.
  const timePart = (new Date().getTime().toString(16)+"FF").substr(0,11);
  const s = "ssssssss-xxxx-4xxx-yxxx-x".replace(/[xys]/g, (c) => {
    const r = c === "s" ? Math.floor(Math.random() * 16) : (query_builder_seed++) & 0xf;
    const v = c === "x" ? r : (r & 0x3 | 0x8);
    return v.toString(16);
  });
  return s + timePart;
};