sass-loader: sass-loader creating broken paths in sourcemap

Hey all, I’m stumped, can anyone help? Sourcemaps are pointing at broken paths

See how it’s doubling up the paths, some with forward slash, some with backslash? I’m on Windows…

When I replace sass-loader with just css-loader, or even post-css-loader + css-loader, sourcemaps work, so that’s why I think it’s sass-loader

Not sure what else will be helpful, so here’s the full webpack config:

const path = require('path');
const webpack = require('webpack');

module.exports = (env) => {
  const isProduction = env === 'production';

  const config = {
    devServer: {
      contentBase: path.resolve(__dirname, 'dist'),
      headers: {
        'Access-Control-Allow-Origin': '*',
        'Access-Control-Allow-Methods': 'GET, POST, PUT, DELETE, PATCH, OPTIONS',
        'Access-Control-Allow-Headers': 'X-Requested-With, content-type, Authorization'
      }
    },
    entry: './src/index.js',
    output: {
      path: path.resolve(__dirname, 'dist'),
      filename: 'app.js',
      publicPath: 'http://localhost:8080/'
    },
    devtool: isProduction ? '' : 'cheap-module-eval-source-map',
    module: {
      rules: [{
        test: /\.js$/,
        exclude: /(node_modules|bower_components)/,
        use: [
          'babel-loader',
          'eslint-loader'
        ]
      }, {
        test: /\.scss$/,
        use: [
          { loader: 'style-loader' },
          { loader: 'css-loader', options: { sourceMap: true, importLoaders: true } }, // ,
          { loader: 'postcss-loader', options: { sourceMap: 'inline' } },
          { loader: 'sass-loader', options: { sourceMap: true } }
        ]
      }, {
        test: /\.woff(2)?(\?v=[0-9]\.[0-9]\.[0-9])?$/,
        loader: 'url-loader?limit=10000&mimetype=application/font-woff'
      }, {
        test: /\.(ttf|eot|svg)(\?v=[0-9]\.[0-9]\.[0-9])?$/,
        loader: 'file-loader'
      }]
    },
    plugins: [
      new webpack.DefinePlugin({
        'process.env': {
          NODE_ENV: JSON.stringify(isProduction ? 'production' : '')
        }
      })
    ]
  };

  return config;
};