update loaders to webpack 2.x specifics

[NigelEarle]

Updated loaders but still not working. Getting ambiguous error ERROR in Path must be a string. Received undefined.

[lenin-anzen]

You need to Update Babel to the next versions on order to remove the error:

    "babel-core": "^6.25.0",
    "babel-loader": "^7.1.1",
    "babel-polyfill": "6.3.14",
    "babel-preset-es2015": "6.1.18",

[tisto]

Thanks @lenin-anzen! @NigelEarle would you mind giving this a shot?

[tisto]

@NigelEarle I fixed the test problem on travis in master branch. If you would rebase with master, the build should be green and we can merge...

[NigelEarle]

@tisto So sorry for no response earlier. Rebased with origin master as well as updated babel dependencies but error ERROR in Path must be a string. Received undefined. persists. Will look into it very soon. Thanks!

[tisto]

@NigelEarle it seems this is more complex than anticipated. Just upgrading from Node 4.x to 6.x triggers the "Path must be a string" error...