import fs from 'fs';
import path from 'path';
import ExtractTextPlugin from 'extract-text-webpack-plugin';

export function readFileOrEmpty(path) {
  try {
    return fs.readFileSync(path, 'utf-8');
  } catch (e) {
    return '';
  }
}

export const defaultConfig = {
  entry: './index',
  module: {
    rules: [
      {
        test: /\.css$/,
        use: ExtractTextPlugin.extract({
          fallback: { loader: 'style-loader' },
          use: {
            loader: 'css-loader',
            options: { minimize: true }
          }
        })
      },
    ],
  },
  plugins: [],
  context: __dirname,
  output: {
    filename: 'destination.js',
    path: path.resolve(__dirname, '../', 'js', 'default-exports')
  }
};

export function checkForWebpackErrors({err, stats, done}) {
  if (err) return done(err);
  if (stats.hasErrors()) return done(new Error(stats.toString()));
}