cfx.simple-build-tool/example/node_modules/core-js/modules/library/_redefine-all.js

var hide = require('./_hide');
module.exports = function (target, src, safe) {
  for (var key in src) {
    if (safe && target[key]) target[key] = src[key];
    else hide(target, key, src[key]);
  } return target;
};