npm run dev error

Please try:

rm -rf node_modules
rm package-lock.json
npm cache clear --force
npm install

windows和linux下安装时  还会能一个提示

[root@VM_217_200_centos rap2]# npm install

> pre-commit@1.2.2 install /usr/local/rap2/node_modules/pre-commit
> node install.js

> spawn-sync@1.0.15 postinstall /usr/local/rap2/node_modules/spawn-sync
> node postinstall

npm notice created a lockfile as package-lock.json. You should commit this file.
npm WARN optional SKIPPING OPTIONAL DEPENDENCY: fsevents@1.1.3 (node_modules/fsevents):
npm WARN notsup SKIPPING OPTIONAL DEPENDENCY: Unsupported platform for fsevents@1.1.3: wanted {"os":"darwin","arch":"any"} (current: {"os":"linux","arch":"x64"})

源自stackoverflow的一个解答：
fsevents is an API available only on OSX. So if you're using another OS like Windows as do I. 
Normally software that wants to use fsevents will provide an alternative or make it optional as your message reads. To my knowledge it will not stop gulp from running.

所以，它并不影响项目的正常运行。