npm WARN弃用xxx：我该怎么办？
我已经使用了几年的咕噜声，而且一直如此，我已经看到如下的警告：
npm WARN deprecated win-spawn@2.0.0: use [cross-spawn](https://github.com/IndigoUnited/node-cross-spawn) or [cross-spawn-async](https://github.com/IndigoUnited/node-cross-spawn-async) instead. npm WARN deprecated lodash@0.9.2: lodash@<2.0.0 is no longer maintained. Upgrade to lodash@^3.0.0 npm WARN deprecated lodash@1.0.2: lodash@<3.0.0 is no longer maintained. Upgrade to lodash@^4.0.0. npm WARN deprecated graceful-fs@1.2.3: graceful-fs v3.0.0 and before will fail on node releases >= v6.0. Please update to graceful-fs@^4.0.0 as soon as possible. Use 'npm ls graceful-fs' to find it in the tree. npm WARN deprecated lodash@2.2.1: lodash@<3.0.0 is no longer maintained. Upgrade to lodash@^4.0.0. 无论如何，我的项目实际上工作，即使这些警告。 从第一天开始， lodash总是给我警告的。
这里是产生这些错误的package.json文件：
{ "name": "xxx", "version": "0.1.1", "devDependencies": { "autoprefixer": "^6.2.3", "cssnano": "^3.4.0", "grunt": "^0.4.5", "grunt-browser-sync": "^1.5.3", "grunt-contrib-clean": "^1.0.0", "grunt-contrib-concat": "~0.5.0", "grunt-contrib-copy": "^1.0.0", "grunt-contrib-htmlmin": "^0.6.0", "grunt-contrib-imagemin": "^1.0.0", "grunt-contrib-sass": "~0.7.4", "grunt-contrib-uglify": "~0.5.1", "grunt-contrib-watch": "~0.6.1", "grunt-critical": "^0.2.0", "grunt-delete-sync": "0.0.2", "grunt-newer": "^0.7.0", "grunt-postcss": "^0.7.1", "grunt-processhtml": "^0.3.13" } }
我想一些模块或依赖已经过时，但…
1）为什么还在工作？ 忽视警告是否安全？ 2）我怎么知道哪个模块已经过时，我应该怎么做？
弃用意味着它没有得到进一步发展，但也不会再改变。 如果一个模块依赖于一个具有缺陷的不推荐使用的软件包，唯一的解决方法就是升级这个依赖。 但是，没有什么变化，它会一直工作。