当我运行构建并查看preloader.bundle文件时，我发现捆绑包中包含了 React ，但是我没有将React导入我的班级。
有没有一种方法可以清理或优化配置？
这与预设有关吗？
这是我的Webpack配置：
const path = require('path');
const webpack = require('webpack');
const HtmlWebpackPlugin = require('html-webpack-plugin');
const MiniCssExtractPlugin = require("mini-css-extract-plugin");
const CleanWebpackPlugin = require('clean-webpack-plugin');
const UglifyWebpackPlugin = require('uglifyjs-webpack-plugin');
const PATH_APP = path.resolve(__dirname, "app");
const PATH_DIST = path.resolve(__dirname, "dist");
const PATH_PROJ = path.join(PATH_APP, "project");
const NODE_PATH = path.resolve(__dirname, "node_modules");
module.exports = (env, argv) => {
console.log('ENVIRONMENT => ', argv.mode);
const devTool = argv.mode == 'development' ? 'inline-source-map' : 'none';
const devMode = argv.mode == 'development' ? true : false;
let config = {
entry: {
preloader: './app/project/preloader.js',
main: './app/project/index.js',
},
devtool: devTool,
output: {
path: PATH_DIST,
filename: '[name].bundle.js'
},
module: {
rules: [
{
test: /\.(js|jsx)$/,
exclude: /node_modules/,
use: ['babel-loader']
},
{
test: /\.(sa|sc|c)ss$/,
use: [
devMode ? 'style-loader' : MiniCssExtractPlugin.loader,
'css-loader',
'sass-loader'
]
}
]
},
devServer: {
contentBase: path.join(__dirname, 'dist'),
hot: true
},
resolve: {
extensions: ['*', '.js', '.jsx'],
alias: {
assets: path.resolve(__dirname, './src/assets/'),
"~": PATH_APP,
"~fr": PATH_APP + "/alexagena",
"~pr": PATH_APP + "/project",
"~md": PATH_APP + "/materialdesign"
}
},
plugins: [
new HtmlWebpackPlugin({
template: path.join(__dirname, 'app', 'project', 'template.ejs'),
appMountId: 'app-root-container',
title: 'Test',
excludeChunks: ['main']
}),
new MiniCssExtractPlugin({
filename: devMode ? '[name].css' : '[name][hash].css',
chunkFilename: devMode ? '[id].css' : '[id].[hash].css'
}),
new CleanWebpackPlugin([
'dist',
], {
root: __dirname,
exclude: ['data', 'fonts', 'media', 'mock', '.htaccess', 'web.config'],
verbose: true,
dry: false
}
),
]
}
if (devMode)
config.plugins.push(new webpack.HotModuleReplacementPlugin())
return config;
}
这是Preloader文件：
/*
* Preloader
*
*/
class Preloader {
constructor() {
//params
this._container = document.body;
window.appStarted = false;
}
// Public
//-------------------------------------------------------
_startPreloader() {
}
_updatePercent(e, percent) {
}
_preloaderFinished(e) {
app.trigger("preloadcomplete");
if (!window.appStarted) {
setTimeout(() => {
app.trigger("preloadcomplete");
}, 100);
}
}
}
//auto initiate
var __preloader = new Preloader();
还有.babelrc：
{
"presets": [
["env", {
"modules": false,
"targets": {
"browsers": [
"chrome >= 43",
"ie >= 10",
"safari >= 7"
]
}
}],
"react"
],
"plugins": ["react-hot-loader/babel", "transform-object-rest-spread", "react-html-attrs"]
}
生成的prealoader.bundle：
!function(e){var r={};function t(n){if(r[n])return r[n].exports;var o=r[n]={i:n,l:!1,exports:{}};return e[n].call(o.exports,o,o.exports,t),o.l=!0,o.exports}t.m=e,t.c=r,t.d=function(e,r,n){t.o(e,r)||Object.defineProperty(e,r,{enumerable:!0,get:n})},t.r=function(e){"undefined"!=typeof Symbol&&Symbol.toStringTag&&Object.defineProperty(e,Symbol.toStringTag,{value:"Module"}),Object.defineProperty(e,"__esModule",{value:!0})},t.t=function(e,r){if(1&r&&(e=t(e)),8&r)return e;if(4&r&&"object"==typeof e&&e&&e.__esModule)return e;var n=Object.create(null);if(t.r(n),Object.defineProperty(n,"default",{enumerable:!0,value:e}),2&r&&"string"!=typeof e)for(var o in e)t.d(n,o,function(r){return e[r]}.bind(null,o));return n},t.n=function(e){var r=e&&e.__esModule?function(){return e.default}:function(){return e};return t.d(r,"a",r),r},t.o=function(e,r){return Object.prototype.hasOwnProperty.call(e,r)},t.p="",t(t.s=36)}({0:function(module,exports,__webpack_require__){"use strict";var evalAllowed=!1;try{eval("evalAllowed = true")}catch(e){}var platformSupported=!!Object.setPrototypeOf&&evalAllowed;module.exports=__webpack_require__(17)},1:function(e,r,t){"use strict";e.exports=t(18)},14:function(e,r,t){"use strict";
/*
object-assign
(c) Sindre Sorhus
@license MIT
*/var n=Object.getOwnPropertySymbols,o=Object.prototype.hasOwnProperty,u=Object.prototype.propertyIsEnumerable;e.exports=function(){try{if(!Object.assign)return!1;var e=new String("abc");if(e[5]="de","5"===Object.getOwnPropertyNames(e)[0])return!1;for(var r={},t=0;t<10;t++)r["_"+String.fromCharCode(t)]=t;if("0123456789"!==Object.getOwnPropertyNames(r).map(function(e){return r[e]}).join(""))return!1;var n={};return"abcdefghijklmnopqrst".split("").forEach(function(e){n[e]=e}),"abcdefghijklmnopqrst"===Object.keys(Object.assign({},n)).join("")}catch(e){return!1}}()?Object.assign:function(e,r){for(var t,l,i=function(e){if(null==e)throw new TypeError("Object.assign cannot be called with null or undefined");return Object(e)}(e),a=1;a<arguments.length;a++){for(var c in t=Object(arguments[a]))o.call(t,c)&&(i[c]=t[c]);if(n){l=n(t);for(var f=0;f<l.length;f++)u.call(t,l[f])&&(i[l[f]]=t[l[f]])}}return i}},16:function(e,r){e.exports=function(e){return e.webpackPolyfill||(e.deprecate=function(){},e.paths=[],e.children||(e.children=[]),Object.defineProperty(e,"loaded",{enumerable:!0,get:function(){return e.l}}),Object.defineProperty(e,"id",{enumerable:!0,get:function(){return e.i}}),e.webpackPolyfill=1),e}},17:function(e,r,t){"use strict";Object.defineProperty(r,"__esModule",{value:!0});var n,o=(n=t(1))&&"object"==typeof n&&"default"in n?n.default:n,u=function(e,r){if(!(e instanceof r))throw new TypeError("Cannot call a class as a function")},l=function(e,r){if(!e)throw new ReferenceError("this hasn't been initialised - super() hasn't been called");return!r||"object"!=typeof r&&"function"!=typeof r?e:r},i=function(e){function r(){return u(this,r),l(this,e.apply(this,arguments))}return function(e,r){if("function"!=typeof r&&null!==r)throw new TypeError("Super expression must either be null or a function, not "+typeof r);e.prototype=Object.create(r&&r.prototype,{constructor:{value:e,enumerable:!1,writable:!0,configurable:!0}}),r&&(Object.setPrototypeOf?Object.setPrototypeOf(e,r):e.__proto__=r)}(r,e),r.prototype.render=function(){return o.Children.only(this.props.children)},r}(o.Component);r.AppContainer=i,r.hot=function(){return function(e){return e}},r.areComponentsEqual=function(e,r){return e===r},r.setConfig=function(){},r.cold=function(e){return e}},18:function(e,r,t){"use strict";
/** @license React v16.6.1
* react.production.min.js
*
* Copyright (c) Facebook, Inc. and its affiliates.
*
* This source code is licensed under the MIT license found in the
* LICENSE file in the root directory of this source tree.
*/var n=t(14),o="function"==typeof Symbol&&Symbol.for,u=o?Symbol.for("react.element"):60103,l=o?Symbol.for("react.portal"):60106,i=o?Symbol.for("react.fragment"):60107,a=o?Symbol.for("react.strict_mode"):60108,c=o?Symbol.for("react.profiler"):60114,f=o?Symbol.for("react.provider"):60109,p=o?Symbol.for("react.context"):60110,s=o?Symbol.for("react.concurrent_mode"):60111,d=o?
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