css-loader: css-loader doesn't work anymore with v0.15.1

after updated to v0.15.1 from v0.14.x, css loader doesn’t work any more.

here is the config:

const sassLoaders = [
  "css",
  "sass?" + ["outputStyle=expanded",
    "includePaths[]=" + nodeModulesPath,
    "includePaths[]=" + bowerComponentsPath].join("&")
].join("!");

later on

{
        test: /\.scss$/,
        loader: ExtractTextPlugin.extract("style-loader", sassLoaders, {
          publicPath: './'
        })

      },