Error: vue-loader was used without the corresponding plugin

[indus]

Version

15.2.1

I'm getting the error in the title because this if statement is always false. And that's because the paths used to check for the existence of the plugin doesn't match. They have different separators:

value of NS:               "D:\<root>\node_modules\vue-loader\lib"
property of loaderContext: "D:\\<root>\\node_modules\\vue-loader\\lib"

It is hard to provide a reproduction link because this propably just depends on the OS you are using. Nevertheless this property-lookup-test is insuffiecent for me on windows 7.

ref: vuejs/vue-cli#1345
(when I just uncomment the test, everything works as expected)

[yyx990803]

This is very weird... looks like the value was somehow escaped when being exposed on loaderContext? Can you try to modify NS to a constant string in your local node_modules/vue-loader/lib/plugin.js to see if that solves the problem?

[indus]

Windows and paths 😩
I can't reproduce the error on my own computer (Windows 10; node 8.6.0; npm 5.3.0) - but on Monday I'm back in the office and can tell you if a simple string fixes the problem (I would guess so).
Looks like this is somewhat specific to my environment - but I'm unaware of any strange aspects in my setup.