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/* eslint-env node */

const webpack = require('webpack');
const resolve = require('path').resolve;
const HtmlWebpackPlugin = require('html-webpack-plugin');

module.exports = env => {
    const addPlugin = (add, plugin) => add ? plugin : undefined;
    const ifProd = plugin => addPlugin(env.prod, plugin);
    const removeEmpty = array => array.filter(i => !!i);

    return {
        devServer: {
            historyApiFallback: true
        },
        entry: './app.js',
        output: {
            filename: 'bundle.[chunkhash].js',
            path: resolve(__dirname, 'dist'),
            pathinfo: !env.prod,
        },
        context: resolve(__dirname, 'src'),
        devtool: env.prod ? 'source-map' : 'eval',
        bail: env.prod,
        module: {
            loaders: [
                { test: /\.js$/, loader: 'babel!eslint', exclude: /node_modules/ },
                { test: /\.css$/, loader: 'style!css', exclude: /node_modules/ }
            ]
        },
        plugins: removeEmpty([
            ifProd(new webpack.optimize.DedupePlugin()),
            ifProd(new webpack.LoaderOptionsPlugin({
                minimize: true,
                debug: false
            })),
            ifProd(new webpack.DefinePlugin({
                'process.env': {
                    NODE_ENV: '"production"'
                }
            })),
            ifProd(new webpack.optimize.UglifyJsPlugin({
                compress: {
                    screw_ie8: true, //eslint-disable-line
                    warnings: false
                }
            })),
            new HtmlWebpackPlugin({ template: '../index.html'})
        ])
    }
};