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

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

var shared = require('./_shared')('keys');
var uid = require('./_uid');
module.exports = function (key) {
  return shared[key] || (shared[key] = uid(key));
};