ERROR in Entry module not found: Error: Cannot resolve 'file' or 'directory'

When using 1.4.0 I get the error above, <1.4.0 works great. complaint is ./spec/index.js, I assume files is the culprit, not preprocessors:

files: [
    './spec/index.js'
],

or

preprocessors: {
    './spec/index.js': ['webpack']
},

Coincidentally, I see the new webpack-karma reporter is spec, however I can’t imagine that causing a clash.

[moreirayokoyama]

@Keats post on Stackoverflow has a good solution.

set the extensions property on Webpack resolve configuration like this:

webpackConfig.resolve.extensions = [‘’, ‘.js’, ‘.coffee’] //ts, or anything else

That solved it for me.

[tiye]

I think Webpack’s error are really unfriendly… I tried for half an hour but failed to found out what’s wrong when it gives this error.