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[英]Module Not Found (possible Polyfill webpack 5) error when deploying react app to heroku
[英]Heroku/Webpack/React - Module not found when building on Heroku but found locally?
我正在尝试将React / Express应用程序部署到Heroku。
package.json如下所示:
"scripts": {
"test": "echo \"Error: no test specified\" && exit 1",
"dev": "webpack-dev-server",
"start": "node server/server.js",
"postinstall": "webpack -p"
},
"devDependencies": {
"babel-core": "^6.26.0",
"babel-loader": "^7.1.2",
"babel-preset-es2015": "^6.24.1",
"babel-preset-react": "^6.24.1",
"css-loader": "^0.28.7",
"postcss-loader": "^2.0.6",
"style-loader": "^0.18.2",
"uglifyjs-webpack-plugin": "^0.4.6",
"webpack": "^3.6.0",
"webpack-dev-server": "^2.8.2"
},
"dependencies": {
"express": "^4.15.4",
"react": "^15.6.1",
"react-dom": "^15.6.1",
"react-router-dom": "^4.2.2"
}
当我尝试在heroku上构建我的应用程序时,由于以下错误,构建失败:
ERROR in ./client/components/App.js
Module not found: Error: Can't resolve './Home' in '/tmp/build_341b9f12a6b1d7c2a28d1241f0b7c5b8/Swoodend-mCMS-f134118/client/components'
@ ./client/components/App.js 19:12-29
@ ./client/index.js
npm ERR! code ELIFECYCLE
npm ERR! errno 2
npm ERR! scms@1.0.0 postinstall: `webpack -p`
npm ERR! Exit status 2
npm ERR!
npm ERR! Failed at the scms@1.0.0 postinstall script.
npm ERR! This is probably not a problem with npm. There is likely additional logging output above.
当我注释掉App.js中Home组件的导入语句时,构建将成功完成,即:
//import Home from './Home';
但是,当我打开此应用程序时,什么也不会呈现(因为我相信我在ReactRouter中遇到了一个单独的问题)。 谁能指导我寻求使该组件正常工作的解决方案? 我不明白为什么它在本地可用,但不能在heroku上导入。 我想我可能已经更改了文件名的大小写(从home.js更改为Home.js),但是我不确定这是否以某种方式引起了影响?
谢谢
编辑:
如果相关,这是我的webpack.config:
module.exports = {
entry: './client/index.js',
output: { path: __dirname + '/build', filename: 'bundle.js' },
module: {
rules: [
{
test: /.jsx?$/,
loader: 'babel-loader',
exclude: /node-modules/,
query: {
presets: ['es2015', 'react']
}
},
{
test: /\.css$/,
loader: ['style-loader', 'css-loader', 'postcss-loader']
}
]
},
devServer: {
contentBase: path.join(__dirname, "/build"),
//proxies all requests to express server. if route does not begin
//with /api the server will send back index.html and let
//react router handle the routing
proxy: {
'/**': {
target: 'http://localhost:3001',
secure: false
}
},
compress: true,
port: 3000,
open: true
},
plugins: [
new UglifyJSPlugin({
test: /\.js$/,
parallel: {
cache: true,
workers: 2
},
uglifyOptions: {
ecma: 6
}
})
]
};
编辑2:根据要求的家庭组件
import React, { Component } from 'react';
import '../public/css/home.css';
export default class Home extends Component {
componentDidMount(){
fetch('/api/bar') //testing proxy
.then((res) => {
return res.json();
}).then((res) => {
console.log(res.message);
})
}
render(){
return (
<div className="main-container">
<img id="main-image" src="http://res.cloudinary.com/ddbeeuyr4/image/upload/dn_176,e_blur:805,o_71/v1506459774/office-2616310_1920_o1lmpb.jpg"/>
<div className="info-box">
<h1><span className="home-pink">m</span><span className="home-green">CMS</span></h1>
<h3>a mini content management system</h3>
</div>
</div>
);
}
}
我遇到了同样的问题,当我在本地运行良好的代码推送到heroku时失败,并出现模块未找到错误
ERROR in ./src/client/app.js
Module not found: Error: Can't resolve './components/Root.jsx' in
/app/src/client'
安装区分大小写的路径的webpack插件对我有帮助
不要忘了更新文档中显示的webpack配置。
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