const webpack = require('webpack')
module.exports = {
    entry: __dirname + '/index.js',
    output: {
        path: __dirname + '/dist', 
        filename: 'out.js',
        libraryTarget: 'umd',
    },
    externals: {
        three: 'three',
    },
    mode: 'development', 
    watch: true,
    watchOptions: {
        poll: 100,
        aggregateTimeout: 500,
        ignored: /node_modules/,
    },
    devtool: 'source-map',
    module: {
        rules: [
            {
                test: /.js$/,
                exclude: /(node_modules|bower_components)/ /**加速打包 */,
                use: {
                    loader: 'babel-loader', //https://www.jianshu.com/p/e8cd05e63d97 博客
                    // options: {
                    //     presets: ['@babel/preset-env'] // //@babel/preset-env 就是用来将ES6语法转换成浏览器能运行的ES5语法的
                    // }
                },
            }, //test 用于标识出应该被对应的 loader 进行转换的某个或某些文件,use 是用到的loader,改行意思为遇到js文件用babel-loader加载转换
            {
                test: /\.worker\.js$/, //以.worker.js结尾的文件将被worker-loader加载
                use: { loader: 'worker-loader', options: { inline: 'fallback' } }, //将worker文件打包进来
            },
        ],
    },
    resolve: {
        extensions: ['.js'], //后缀名补全
    },
    plugins: [],
}