运行npm run dev 启动项目后，出现如下 Warning
[2019-06-05T17:13:16.265] [INFO] - WARNING Compiled with 2 warnings
17:13:16
[2019-06-05T17:13:16.265] [INFO] -
[2019-06-05T17:13:16.268] [INFO] - warning in ./node_modules/es6-promise/dist/es6-promise.js
[2019-06-05T17:13:16.268] [INFO] -
[2019-06-05T17:13:16.269] [INFO] - There are multiple modules with names that only differ in casing.
This can lead to unexpected behavior when compiling on a filesystem with other case-semantic.
Use equal casing. Compare these module identifiers:
* E:\RAIS\rais-project\node_modules\es6-promise\dist\es6-promise.js
Used by 11 module(s), i. e.
E:\RAIS\rais-project\node_modules\babel-polyfill\node_modules\regenerator-runtime\runtime.js
* e:\RAIS\rais-project\node_modules\es6-promise\dist\es6-promise.js
Used by 1 module(s), i. e.
e:\RAIS\rais-project\node_modules\_@ckeditor_ckeditor5-build-classic@12.1.0@@ckeditor\ckeditor5-build-classic\build\ckeditor.js
[2019-06-05T17:13:16.269] [INFO] -
[2019-06-05T17:13:16.270] [INFO] - warning in ./node_modules/process/browser.js
[2019-06-05T17:13:16.270] [INFO] -
[2019-06-05T17:13:16.271] [INFO] - There are multiple modules with names that only differ in casing.
This can lead to unexpected behavior when compiling on a filesystem with other case-semantic.
Use equal casing. Compare these module identifiers:
* E:\RAIS\rais-project\node_modules\process\browser.js
Used by 13 module(s), i. e.
E:\RAIS\rais-project\node_modules\vue-localstorage\dist\vue-local-storage.js
* e:\RAIS\rais-project\node_modules\process\browser.js
Used by 1 module(s), i. e.
e:\RAIS\rais-project\node_modules\es6-promise\dist\es6-promise.js 
问题原因：
windows下盘符的大小写导致的。
实际上，上面显示的警告，是指引用文件的时候大小写错了，有时候是盘符，有时候是引入文件的时候插件名
我打开VS Code 在cmd里运行的时候，自动定位到项目地址，盘符是大写，改成小写的e盘符就没问题了。
npm run dev 启动项目后，出现编译警告 Compiled with 2 warnings
原文：https://www.cnblogs.com/JasmineLily/p/10981051.html