vue ui fails on 3.0.0-rc.7 and Win10

Version

3.0.0-rc.7

Node and OS info

Node v8.11.3 / NPM 5.7.1 / Windows 10

Steps to reproduce

vue ui fails on arbitrary projects with error:

ERROR  Error: EISDIR: illegal operation on a directory, read
Error: EISDIR: illegal operation on a directory, read
    at Object.fs.readSync (fs.js:675:18)
    at tryReadSync (fs.js:540:20)
    at Object.fs.readFileSync (fs.js:583:19)
    at windowsConfigPath (C:\Users\beat.grabe\AppData\Roaming\npm\node_modules\@vue\cli\lib\util\rcPath.js:30:35)
    at exports.getRcPath.file (C:\Users\beat.grabe\AppData\Roaming\npm\node_modules\@vue\cli\lib\util\rcPath.js:41:3)
    at Object.<anonymous> (C:\Users\beat.grabe\AppData\Roaming\npm\node_modules\@vue\cli\node_modules\@vue\cli-ui\apollo-server\util\db.js:18:5)
    at Module._compile (module.js:652:30)
    at Object.Module._extensions..js (module.js:663:10)
    at Module.load (module.js:565:32)
    at tryModuleLoad (module.js:505:12)

What is expected?

The vue-cli user interface will open

What is actually happening?

The command is failing

[yyx990803]

@Akryum I’m going to revert it because I don’t see much benefit. The user who wants a different config location can use VUE_CLI_CONFIG_PATH anyway.

[Samuell1]

I think its because it wants to read folder .vue-cli-ui but it should read only file.