解决vue项目build的时候报错Warning: Accessing non-existent property ‘cat‘ of module exports inside circular

* 正在执行任务: npm run build

> selection-tool@1.0.0 build
> node build/build.js

- building for production...(node:8992) Warning: Accessing non-existent property 'cat' of module exports inside circular dependency
(Use `node --trace-warnings ...` to show where the warning was created)
(node:8992) Warning: Accessing non-existent property 'cd' of module exports inside circular dependency
(node:8992) Warning: Accessing non-existent property 'chmod' of module exports inside circular dependency
(node:8992) Warning: Accessing non-existent property 'cp' of module exports inside circular dependency
(node:8992) Warning: Accessing non-existent property 'dirs' of module exports inside circular dependency
(node:8992) Warning: Accessing non-existent property 'pushd' of module exports inside circular dependency
(node:8992) Warning: Accessing non-existent property 'popd' of module exports inside circular dependency
(node:8992) Warning: Accessing non-existent property 'echo' of module exports inside circular dependency
(node:8992) Warning: Accessing non-existent property 'tempdir' of module exports inside circular dependency
(node:8992) Warning: Accessing non-existent property 'pwd' of module exports inside circular dependency
(node:8992) Warning: Accessing non-existent property 'exec' of module exports inside circular dependency
(node:8992) Warning: Accessing non-existent property 'ls' of module exports inside circular dependency
(node:8992) Warning: Accessing non-existent property 'find' of module exports inside circular dependency
(node:8992) Warning: Accessing non-existent property 'grep' of module exports inside circular dependency
(node:8992) Warning: Accessing non-existent property 'head' of module exports inside circular dependency
(node:8992) Warning: Accessing non-existent property 'ln' of module exports inside circular dependency
(node:8992) Warning: Accessing non-existent property 'mkdir' of module exports inside circular dependency
(node:8992) Warning: Accessing non-existent property 'rm' of module exports inside circular dependency
(node:8992) Warning: Accessing non-existent property 'mv' of module exports inside circular dependency
(node:8992) Warning: Accessing non-existent property 'sed' of module exports inside circular dependency
(node:8992) Warning: Accessing non-existent property 'set' of module exports inside circular dependency
(node:8992) Warning: Accessing non-existent property 'sort' of module exports inside circular dependency
(node:8992) Warning: Accessing non-existent property 'tail' of module exports inside circular dependency
(node:8992) Warning: Accessing non-existent property 'test' of module exports inside circular dependency
(node:8992) Warning: Accessing non-existent property 'to' of module exports inside circular dependency
(node:8992) Warning: Accessing non-existent property 'toEnd' of module exports inside circular dependency
(node:8992) Warning: Accessing non-existent property 'touch' of module exports inside circular dependency
(node:8992) Warning: Accessing non-existent property 'uniq' of module exports inside circular dependency
(node:8992) Warning: Accessing non-existent property 'which' of module exports inside circular dependency
Hash: be3696dd62e82cf71a71
Version: webpack 3.12.0
Time: 28676ms

package.json里面的 "shelljs":版本修改为0.8.4重新 npm i 然后npm run build即可