关于 NPM run watch-poll 报错问题
此教程存在缺陷，按照他的步骤，在resources/assets/sass/app.scss文件中只保留下面一行：
// Bootstrap
@import "node_modules/bootstrap-sass/assets/stylesheets/bootstrap";但是运行 npm run watch-poll时仍然报错；
查看报错信息，发现未找到 bootstrap-sass下的文件：
经核查发现node_modules/ 路径下没有bootstrap-sass包；
解决办法如下：
npm install bootstrap-sass下载bootstrap-sass包，重新编译一下
npm run watch-poll
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我执行你的方法：npm install bootstrap-sass
还是报错。我卡这一天一夜了，不知道什么时候能解决。
npm WARN rollback Rolling back @babel/core@7.5.5 failed (this is probably harmless): EBUSY: resource busy or locked, unlink '/home/vagrant/Code/weibo/node_modules/@babel/core/.nfs0000000000002d4a0000001d'
npm WARN rollback Rolling back rc@1.2.8 failed (this is probably harmless): EBUSY: resource busy or locked, unlink '/home/vagrant/Code/weibo/node_modules/fsevents/node_modules/rc/.nfs0000000000002de300000046'
npm WARN rollback Rolling back fsevents@1.2.9 failed (this is probably harmless): EBUSY: resource busy or locked, unlink '/home/vagrant/Code/weibo/node_modules/fsevents/node_modules/inflight/.nfs0000000000002dce0000004e'
npm WARN optional SKIPPING OPTIONAL DEPENDENCY: fsevents@1.2.9 (node_modules/fsevents):
npm WARN notsup SKIPPING OPTIONAL DEPENDENCY: Unsupported platform for fsevents@1.2.9: wanted {"os":"darwin","arch":"any"} (current: {"os":"linux","arch":"x64"})
npm ERR! path ../@babel/parser/bin/babel-parser.js
npm ERR! code EIO
npm ERR! errno -5
npm ERR! syscall symlink
npm ERR! EIO: i/o error, symlink '../@babel/parser/bin/babel-parser.js' -> '/home/vagrant/Code/weibo/node_modules/.bin/parser'
npm ERR! A complete log of this run can be found in:
npm ERR! /home/vagrant/.npm/_logs/2019-07-25T12_52_58_998Z-debug.log
➜ weibo git:(filling-layout-style) ✗
Windows 轻而易举搞定 $ NPM run watch-poll 全过程
分享：Windows 轻而易举搞定 $ NPM run watch-poll 全过程