Webpack：移动webpack / react文件的位置后，npm start“找不到模块：错误：无法解析...”

Posted

技术标签:

【中文标题】Webpack：移动webpack / react文件的位置后，npm start“找不到模块：错误：无法解析...”【英文标题】：Webpack: npm start "Module not found: Error: Can't resolve ..." after moving location for webpack / react files 【发布时间】：2019-11-10 07:08:24 【问题描述】：

我的项目正在运行，我可以在使用 Chrome 时在 localhost:8080 上查看我的网页。 我试图学习一些东西，所以我将所有文件都放在一个名为“dir copy”的文件夹中，而不仅仅是 dir。 当一切都如我所愿时，我将所有文件移回“目录”并关闭浏览器。 当我再次尝试运行npm start 时，我收到了这个错误输出

来自 npm start 的输出

Jacob:Name_html Jacob$ npm start

> Name@ start Dir/Name/Name_html
> node ./node_modules/webpack-dev-server/bin/webpack-dev-server.js

ℹ ｢wds｣: Project is running at http://localhost:8080/
ℹ ｢wds｣: webpack output is served from /
ℹ ｢wds｣: Content not from webpack is served from Dir/Name/Name_html
✖ ｢wdm｣: Hash: a0d05c0fdc6ff660f346
Version: webpack 4.35.0
Time: 1985ms
Built at: 06/28/2019 3:29:15 AM
      Asset     Size  Chunks             Chunk Names
./bundle.js  908 KiB    main  [emitted]  main
Entrypoint main = ./bundle.js
[1] multi (webpack)-dev-server/client?http://localhost ./src/index.jsx 40 bytes main [built]
[./es6/Banner.js] 1010 bytes main [built]
[./es6/Footer.js] 320 bytes main [built]
[./es6/Header.js] 387 bytes main [built]
[./es6/HomePageServices.js] 3.4 KiB main [built]
[./es6/NavBar.js] 689 bytes main [built]
[./node_modules/react-dom/cjs/react-dom.development.js] 768 KiB main [built]
[./node_modules/react-dom/index.js] 1.33 KiB main [built]
[./node_modules/react/cjs/react.development.js] 62.3 KiB main [built]
[./node_modules/react/index.js] 190 bytes main [built]
[./node_modules/scheduler/cjs/scheduler.development.js] 23.3 KiB main [built]
[./node_modules/scheduler/index.js] 198 bytes main [built]
[./node_modules/webpack-dev-server/client/index.js?http://localhost] (webpack)-dev-server/client?http://localhost 4.29 KiB main [built]
[./node_modules/webpack/hot sync ^\.\/log$] (webpack)/hot sync nonrecursive ^\.\/log$ 160 bytes main [built]
[./src/index.jsx] 561 bytes main [built]
    + 2 hidden modules

ERROR in (webpack)-dev-server/client?http://localhost
Module not found: Error: Can't resolve './overlay' in 'Dir/Name/Name_html/node_modules/webpack-dev-server/client'
 @ (webpack)-dev-server/client?http://localhost 10:14-34
 @ multi (webpack)-dev-server/client?http://localhost ./src/index.jsx

ERROR in (webpack)-dev-server/client?http://localhost
Module not found: Error: Can't resolve './socket' in 'Dir/Name/Name_html/node_modules/webpack-dev-server/client'
 @ (webpack)-dev-server/client?http://localhost 8:13-32
 @ multi (webpack)-dev-server/client?http://localhost ./src/index.jsx

ERROR in (webpack)-dev-server/client?http://localhost
Module not found: Error: Can't resolve './utils/createSocketUrl' in 'Dir/Name/Name_html/node_modules/webpack-dev-server/client'
 @ (webpack)-dev-server/client?http://localhost 20:22-56
 @ multi (webpack)-dev-server/client?http://localhost ./src/index.jsx

ERROR in (webpack)-dev-server/client?http://localhost
Module not found: Error: Can't resolve './utils/log' in 'Dir/Name/Name_html/node_modules/webpack-dev-server/client'
 @ (webpack)-dev-server/client?http://localhost 12:15-37
 @ multi (webpack)-dev-server/client?http://localhost ./src/index.jsx

ERROR in (webpack)-dev-server/client?http://localhost
Module not found: Error: Can't resolve './utils/reloadApp' in 'Dir/Name/Name_html/node_modules/webpack-dev-server/client'
 @ (webpack)-dev-server/client?http://localhost 18:16-44
 @ multi (webpack)-dev-server/client?http://localhost ./src/index.jsx

ERROR in (webpack)-dev-server/client?http://localhost
Module not found: Error: Can't resolve './utils/sendMessage' in 'Dir/Name/Name_html/node_modules/webpack-dev-server/client'
 @ (webpack)-dev-server/client?http://localhost 16:18-48
 @ multi (webpack)-dev-server/client?http://localhost ./src/index.jsx

ERROR in ./node_modules/react-dom/cjs/react-dom.development.js
Module not found: Error: Can't resolve 'object-assign' in 'Dir/Name/Name_html/node_modules/react-dom/cjs'
 @ ./node_modules/react-dom/cjs/react-dom.development.js 19:14-38
 @ ./node_modules/react-dom/index.js
 @ ./src/index.jsx
 @ multi ./src/index.jsx

ERROR in ./node_modules/react/cjs/react.development.js
Module not found: Error: Can't resolve 'object-assign' in 'Dir/Name/Name_html/node_modules/react/cjs'
 @ ./node_modules/react/cjs/react.development.js 18:14-38
 @ ./node_modules/react/index.js
 @ ./src/index.jsx
 @ multi ./src/index.jsx

ERROR in ./node_modules/react-dom/cjs/react-dom.development.js
Module not found: Error: Can't resolve 'prop-types/checkPropTypes' in 'Dir/Name/Name_html/node_modules/react-dom/cjs'
 @ ./node_modules/react-dom/cjs/react-dom.development.js 20:21-57
 @ ./node_modules/react-dom/index.js
 @ ./src/index.jsx
 @ multi ./src/index.jsx

ERROR in ./node_modules/react/cjs/react.development.js
Module not found: Error: Can't resolve 'prop-types/checkPropTypes' in 'Dir/Name/Name_html/node_modules/react/cjs'
 @ ./node_modules/react/cjs/react.development.js 19:21-57
 @ ./node_modules/react/index.js
 @ ./src/index.jsx
 @ multi ./src/index.jsx

ERROR in ./node_modules/react-dom/cjs/react-dom.development.js
Module not found: Error: Can't resolve 'scheduler/tracing' in 'Dir/Name/Name_html/node_modules/react-dom/cjs'
 @ ./node_modules/react-dom/cjs/react-dom.development.js 22:14-42
 @ ./node_modules/react-dom/index.js
 @ ./src/index.jsx
 @ multi ./src/index.jsx

ERROR in (webpack)-dev-server/client?http://localhost
Module not found: Error: Can't resolve 'strip-ansi' in 'Dir/Name/Name_html/node_modules/webpack-dev-server/client'
 @ (webpack)-dev-server/client?http://localhost 6:16-37
 @ multi (webpack)-dev-server/client?http://localhost ./src/index.jsx
ℹ ｢wdm｣: Failed to compile.

这些是一些无效的方法

Adding modules: ["src", "node_modules"] to webpack.config.js

Deleting node_modules and running npm install again

src/index.jsx

import React from 'react';
import ReactDOM from 'react-dom';
import someSelfCreatedComponents from ../es6/SelfCreatedComponents

const Content = () => 
    return (
        <React.Fragment>
            <Header />
            <Banner />
            <MoreThings />
            <Footer />
        </React.Fragment>
    )


ReactDOM.render (
    <Content />,
    document.getElementById('Content')
)

webpack.config.js

module.exports = 
	entry: [
		'./src/index.jsx'	
	],
	output: 
		filename: './bundle.js'	//File that all react gets compioled into
	,
	module: 
		rules: [
			
				exclude: /node_modules/,
				use: [
					'babel-loader'
				]
			
		]
	,
	resolve: 
		extensions: ['js', '.jsx']

package.json


  "name": "Name",
  "version": "",
  "description": "",
  "main": "index.js",
  "scripts": 
    "start": "node ./node_modules/webpack-dev-server/bin/webpack-dev-server.js"
  ,
  "dependencies": 
    "@babel/preset-es2015": "^7.0.0-beta.53",
    "babel-core": "^6.26.3",
    "babel-plugin-transform-object-rest-spread": "^6.26.0",
    "babel-preset-env": "^1.7.0",
    "babel-preset-es2015": "^6.24.1",
    "babel-preset-react": "^6.24.1",
    "babel-preset-stage-1": "^6.24.1",
    "react": "^16.8.6",
    "react-dom": "^16.8.6",
    "webpack-cli": "^3.3.5",
    "webpack-dev-server": "^3.7.2"
  ,
  "devDependencies": 
    "@babel/core": "^7.4.5",
    "@babel/preset-env": "^7.4.5",
    "@babel/preset-react": "^7.0.0",
    "babel-loader": "^8.0.6",
    "webpack": "^4.35.0"

.babelrc


	"presets": ["@babel/preset-react", "@babel/preset-env"]

index.html

<!DOCTYPE html>
<html>
  <head>
    <meta charset="UTF-8" />
    <title>Name</title>
    
    <link rel="stylesheet" type="text/css" href="css/Main.css">

    <link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/4.7.0/css/font-awesome.min.css">
    <meta name="viewport" content="width=device-width, initial-scale=1.00, maximum-scale=1.10, minimum-scale=0.80">

  </head>
  <body>
    <div id='Content'></div>
    <script src='bundle.js'></script>
  </body>
</html>

文件排列

更新

我阅读了 Saheed 在下面的答案中发布的 blog article，并尝试通过删除 webpack.config.js 文件并将文件缩减为

来修复我的项目 

module.exports = 
	module: 
		rules: [
			
				exclude: /node_modules/,
				use: [
					'babel-loader'
				]
			
		]
	,
	resolve: 
		extensions: ['js', '.jsx']

两次尝试后，我仍然收到相同的错误。

【问题讨论】：

【参考方案1】：

如果您想避免核选项，请确保 .js 包含在 webpack 的已解析扩展中。

这里的问题可能是js之前缺少.造成的：

module.exports = 
    // ...
    resolve: 
        extensions: ['.js', '.jsx']

【讨论】：

谢谢！你救了我。【参考方案2】：

找到了解决方案，但它并不能完全回答我的代码出了什么问题，下面有一条评论试图回答问题所在。

我删除了我的 .babelrc、package-lock.json、webpack.config.js、package.json 和 node 模块，然后关注this tutorial for setting up react, babel7, and webpack4 from scratch，因为它是我能找到的最有用的一个

这里是它的摘要

他们从

开始

mkdir default &amp;&amp; cd default &amp;&amp; yarn init -y

然后我安装了以下模块

npm install @babel/core @babel/cli @babel/preset-env @babel/preset-react babel-loader -D

并将下面的代码复制粘贴到.babelrc

文件中 

  "presets": ["@babel/preset-env", "@babel/preset-react"]

我安装了更多模块

npm install webpack webpack-cli webpack-dev-server html-webpack-plugin html-webpack-template -D

并将下面的代码复制并粘贴到 webpack.config.js 中（稍作调整，因为我收到了错误Uncaught Error: Target container is not a DOM element.）

const webpack = require('webpack');
const HtmlWebpackPlugin = require('html-webpack-plugin');
const HtmlWebpackTemplate = require('html-webpack-template');
const path = require('path');

const config = 
  entry: './src/index.js',
  output: 
    path: path.resolve(__dirname, './dist'),
    filename: 'bundle.js',
  ,
  module: 
    rules: [
      
        test: /\.(js|jsx)$/,
        use: 'babel-loader',
        exclude: /node_modules/,
      ,
    ],
  ,
  resolve: 
    extensions: ['.js', '.jsx'],
  ,
;

module.exports = config;
npm install react react-dom

而且我没有更改我的 index.js，但是教程中列出的那个是

import React from "react";
import ReactDOM from "react-dom";

function App() 
  return (
    <div>
      <h1>Hello blog readers</h1>
    </div>
  );


const rootElement = document.getElementById("app");
ReactDOM.render(<App />, rootElement);

【讨论】：

你原来的 webpack.config.js 输出属性有一个文件名属性，它的值有一个相对路径 + 文件名，即。你有'./bundle.js'。您修改后的输出仅提供文件名，即。 'bundle.js' 。此外，修改后的配置通过提供指向目录的路径来查找文件 bundle.js 来增加精度，该文件告诉输出精确地将 bundle.js 放置在哪里，即 YOUR_ROOT/dist/bundle.js ；你的原件没有给出精确度。 webpack.js.org/configuration/output/#outputfilename 和 webpack.js.org/configuration/output/#outputpath【参考方案3】：

就我而言，我正在处理打字稿项目。

我使用的是 ts-loader 版本 8.2.0，我升级到版本 ts-loader@9.2.5 并且错误消失了。

【讨论】：

以上是关于Webpack：移动webpack / react文件的位置后，npm start“找不到模块：错误：无法解析...”的主要内容，如果未能解决你的问题，请参考以下文章

手动用webpack-chain 搭建移动端react环境

手动用webpack-chain 搭建移动端react环境

react案例->新闻移动客户端--（react+redux+es6+webpack+es6的spa应用）

最小白的webpack+react环境搭建

我无法使用 webpack 导入 React 组件

图书推荐React全栈：Redux+Flux+webpack+Babel整合开发