'use strict'

// 通用的webapck基础配置，主要是一些loader的支持
const path = require('path')
const utils = require('./utils')
const config = require('../config')
const vueLoaderConfig = require('./vue-loader.conf')

function resolve(dir) {
    return path.join(__dirname, '..', dir);
}

const createLintingRule = () => ({
    test: /\.(js|vue)$/,
    loader: 'eslint-loader',
    enforce: 'pre',
    include: [resolve('src'), resolve('test')],
    options: {
        formatter: require('eslint-friendly-formatter'),
        emitWarning: !config.dev.showEslintErrorsInOverlay
    }
})

module.exports = {

    context: path.resolve(__dirname, '../'),

    //  模块的入口文件 - 单页应用
    entry: {
        app: './src/main.js',
    },

    // 输出路径 - /dist/app.js
    output: {
        path: config.build.assetsRoot,
        filename: '[name].js',
        publicPath: process.env.NODE_ENV === 'production' ?
            config.build.assetsPublicPath : config.dev.assetsPublicPath
    },

    // 模块路径解析
    resolve: {

        //  默认检查的后缀名
        extensions: ['.js', '.vue', '.json'],

        // 路径标识，用于require解析路径 默认@为src
        alias: {
            'vue$': 'vue/dist/vue.esm.js', // $为严格匹配
            '@': resolve('src'),
            '~': resolve('static')
        }
    },

    // 加载的loader
    module: {
        rules: [
            ...(config.dev.useEslint ? [createLintingRule()] : []),
            {
                test: /\.vue$/,
                loader: 'vue-loader',
                options: vueLoaderConfig  // 分离vue中的css代码，
                                          // 编译为css代码块，
                                          // 提取为独立的文件，
            },
            {
                test: /\.js$/,
                loader: 'babel-loader',
                include: [resolve('src'), resolve('test'), resolve('node_modules/webpack-dev-server/client')]
            },
            {
                test: /\.(png|jpe?g|gif|svg)(\?.*)?$/,
                loader: 'url-loader',
                options: {
                    limit: 10000,
                    name: utils.assetsPath('img/[name].[hash:7].[ext]')
                }
            },
            {
                test: /\.(mp4|webm|ogg|mp3|wav|flac|aac)(\?.*)?$/,
                loader: 'url-loader',
                options: {
                    limit: 10000,
                    name: utils.assetsPath('media/[name].[hash:7].[ext]')
                }
            },
            {
                test: /\.(woff2?|eot|ttf|otf)(\?.*)?$/,
                loader: 'url-loader',
                options: {
                    limit: 10000,
                    name: utils.assetsPath('fonts/[name].[hash:7].[ext]')
                }
            }
        ]
    },

    node: {
        // prevent webpack from injecting useless setImmediate polyfill because Vue
        // source contains it (although only uses it if it's native).
        setImmediate: false,
        // prevent webpack from injecting mocks to Node native modules
        // that does not make sense for the client
        dgram: 'empty',
        fs: 'empty',
        net: 'empty',
        tls: 'empty',
        child_process: 'empty'
    }
}