only-changed-jest-watch-plugin/example/node_modules/core-js/modules/_uid.js

Jest watch plugin for running either only the modified test (for TDD), or tests of dependant modules

var id = 0;
var px = Math.random();
module.exports = function (key) {
  return 'Symbol('.concat(key === undefined ? '' : key, ')_', (++id + px).toString(36));
};