var path = require('path');
var CleanWebpackPlugin = require('clean-webpack-plugin');

var pathsToClean = [
    'build'
];
var cleanOptions = {
    root:     __dirname,
    verbose:  true,
    dry:      false
};
module.exports = {
    //项目入口js文件
    mode: 'production',
    entry: ['./src/index.js'],
    //项目输出目录
    output: {
        path: path.resolve(__dirname, 'build'),
        filename: 'sdk.js',
        libraryTarget: 'umd',
        library: "yo_sdk"
    },
    //插件
    plugins: [
        new CleanWebpackPlugin(pathsToClean, cleanOptions)//清除历史版本
    ],
    //加载器
    module: {
        rules: [
            {
                test: /\.js/,
                exclude: /node_modules/,
                use: [
                    {
                        loader: 'babel-loader',
                    }
                ]
            },
            {
                test: /\.(sa|sc|c)ss$/,
                use: [
                    'style-loader',
                    'css-loader',
                    'postcss-loader',
                    'sass-loader'
                ]
            }
        ]
    },
    //模块路径
    resolve:{
        alias: {
            '@': path.resolve(__dirname, 'src')
        }
    }
};