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Why aren't my stylesheets being included in the Webpack build?

Webpack collected files (.css, .js) into a library and use it in another React project. The styles specified in the component do not pass, although the .css file is present and the styles are there.
UiButton.jsx file
import styles from './UiButton.module.css';
const UiButton = () => {
return (
<>
<button className={styles.button}>Text</button>
</>
);
}
export default UiButton;
index.js file
import UiButton from './UiButton/UiButton';
import './index.css';
export { UiButton };
Webpack.config.js file
const path = require('path');
const webpack = require('webpack');
const MiniCssExtractPlugin = require("mini-css-extract-plugin");
// const HtmlWebpackPlugin = require('html-webpack-plugin');
const { CleanWebpackPlugin } = require('clean-webpack-plugin');
module.exports = {
entry: { main: './src/index.js' },
output: {
path: path.resolve(__dirname, 'dist'),
filename: 'index.js',
libraryTarget: "umd",
library: "uilibrarytest"
},
module: {
rules: [
{
test: /\.(js|jsx)$/,
exclude: /node_modules/,
use: {
loader: "babel-loader"
}
},
{
test: /\.css$/,
use: [ 'style-loader', MiniCssExtractPlugin.loader, 'css-loader' ]
}
]
},
plugins: [
new CleanWebpackPlugin(),
new MiniCssExtractPlugin({
filename: 'index.css',
}),
// new HtmlWebpackPlugin({
// template: './public/index.html',
// }),
new webpack.ProvidePlugin({
"React": "react",
}),
],
resolve: {
extensions: ['.js', '.jsx'],
},
}
This is what webpack builds:
.button {
background: red;
}
html {
margin: 0;
padding: 0;
}
How to make it so that when using a component from a given library, the styles are also pulled to it ???

Loaders in Webpack are evaluated from right to left. In your configuration the evaluation order is 'css-loader', MiniCssExtractPlugin.loader, and finally 'style-loader'. But 'style-loader' only injects styles into the DOM. You need MiniCssExtractPlugin.loader to be the first element in the "use" array. See below...
{
test: /\.css$/,
use: [ MiniCssExtractPlugin.loader, 'css-loader' ]
}
Furthermore you can tell webpack to use MiniCssExtractPlugin.loader during production and at other times use 'style-loader'.
const isProduction = process.env.NODE_ENV == 'production';
const stylesHandler = isProduction ? MiniCssExtractPlugin.loader : 'style-loader';
...other config
{
test: /\.css$/,
use: [ stylesHandler, 'css-loader' ]
}
And in your package.json scripts,
"build": "webpack --mode=production --node-env=production"

Uncaught ReferenceError: __webpack_require__ is not defined Deploying to server

I am getting this error when logging into our dev site. This is a part of our migration from .NET framework 4.5.2 to 4.7.2. Though I do not think that has much to do with it. If we publish straight from VS, the page loads fine. If it uses our pipeline, or we did not clear our dirs beforehand, we get this error (in the console browser).
ie-polyfill_aurelia-bootstrapper:1 Uncaught ReferenceError:
webpack_require is not defined
at eval (ie-polyfill_aurelia-bootstrapper:1)
at Object.0 (xxxAppScripts?v=sRzkW2d1FsbC87Brht0ZS8CXZDQaGBaky9ddApOJOaY1:1)
at t (xxxAppScripts?v=sRzkW2d1FsbC87Brht0ZS8CXZDQaGBaky9ddApOJOaY1:1)
at xxxAppScripts?v=sRzkW2d1FsbC87Brht0ZS8CXZDQaGBaky9ddApOJOaY1:1
at xxxAppScripts?v=sRzkW2d1FsbC87Brht0ZS8CXZDQaGBaky9ddApOJOaY1:1
The process of our build should be exactly the same as building with NPM locally, and there are no errors given in the build process. Build is defined for both in the webpack.config.js as follows
const path = require('path');
const CopyWebpackPlugin = require('copy-webpack-plugin');
const ExtractTextPlugin = require('extract-text-webpack-plugin');
const { AureliaPlugin, ModuleDependenciesPlugin } = require('aurelia-webpack-plugin');
const UglifyJsPlugin = require('uglifyjs-webpack-plugin');
const { ProvidePlugin, SourceMapDevToolPlugin } = require('webpack')
const { TsConfigPathsPlugin, CheckerPlugin } = require('awesome-typescript-loader');
const CleanWebpackPlugin = require('clean-webpack-plugin');
// config helpers:
const ensureArray = (config) => config && (Array.isArray(config) ? config : [config]) || []
const when = (condition, config, negativeConfig) =>
condition ? ensureArray(config) : ensureArray(negativeConfig)
// primary config:
const title = 'XXXXXX';
const outDir = path.resolve(__dirname, 'Scripts', 'pub');
const srcDir = path.resolve(__dirname, 'App');
const nodeModulesDir = path.resolve(__dirname, 'node_modules');
const baseUrl = '/';
var isDevBuild = true;
var dev;
if (process.env.NODE_ENV) {
dev = process.env.NODE_ENV.trim();
if (dev === "production") {
isDevBuild = true;
}
}
const cssRules = [
{ loader: 'css-loader' },
{
loader: 'postcss-loader',
options: { plugins: () => [require('autoprefixer')({ browsers: ['last 2 versions'] })] }
},
'sass-loader'
];
module.exports = ({ production, server, extractCss, coverage } = {}) => ({
resolve: {
extensions: ['.ts', '.js'],
modules: [srcDir, 'node_modules'],
plugins: [
new TsConfigPathsPlugin(),
],
alias: {
// Enforce single aurelia-binding, to avoid v1/v2 duplication due to
// out-of-date dependencies on 3rd party aurelia plugins
'aurelia-binding': path.resolve(__dirname, 'node_modules/aurelia-binding'),
'aurelia-bootstrapper': path.resolve(__dirname, 'node_modules/aurelia-bootstrapper')
}
},
entry: {
app: ['./ie-polyfill', 'aurelia-bootstrapper'],
vendor: ['jquery'],
},
output: {
path: outDir,
publicPath: baseUrl,
filename: production ? '[name].[chunkhash].bundle.js' : '[name].[hash].bundle.js',
sourceMapFilename: production ? '[name].[chunkhash].bundle.map' : '[name].[hash].bundle.map',
chunkFilename: production ? '[chunkhash].chunk.js' : '[hash].chunk.js',
},
devServer: {
contentBase: baseUrl,
// serve index.html for all 404 (required for push-state)
historyApiFallback: '/',
},
module: {
rules: [
{
test: /\.css$/i,
issuer: [{ not: [{ test: /\.html$/i }] }],
use: extractCss ? ExtractTextPlugin.extract({
fallback: 'style-loader',
use: cssRules,
}) : ['style-loader', ...cssRules],
},
{
test: /\.css$/i,
issuer: [{ test: /\.html$/i }],
// CSS required in templates cannot be extracted safely
// because Aurelia would try to require it again in runtime
use: cssRules,
},
{
test: /\.scss$/,
exclude: /node_modules/,
use: ExtractTextPlugin.extract({
use: ['css-loader', 'sass-loader']
})
},
{ test: /\.html$/i, loader: 'html-loader' },
{ test: /\.ts$/i, loader: 'awesome-typescript-loader', exclude: nodeModulesDir },
{
test: require.resolve("jquery"),
use: [
{
loader: "expose-loader",
options: "$"
}
]
}
]
},
plugins: [
new CleanWebpackPlugin(),
// required polyfills for non-evergreen browsers
new ProvidePlugin({
Map: 'core-js/es6/map',
WeakMap: 'core-js/es6/weak-map',
Promise: 'core-js/es6/promise',
regeneratorRuntime: 'regenerator-runtime' // to support await/async syntax
}),
new AureliaPlugin({
aureliaApp: 'main'
}),
new ProvidePlugin({
'$': 'jquery',
'jQuery': 'jquery',
'window.jQuery': 'jquery',
}),
new CheckerPlugin(),
new ExtractTextPlugin({
filename: production ? '[contenthash].css' : 'style-[id].css',
allChunks: true,
}),
].concat(isDevBuild ? [
new SourceMapDevToolPlugin({
filename: '[file].map', // Remove this line if you prefer inline source maps
moduleFilenameTemplate: path.relative(outDir, '[resourcePath]') // Point sourcemap entries to the original file locations on disk
})
] : [
new UglifyJsPlugin()
]),
})
There do seem to be a few times a similar question has been asked, but there has not been a solution that worked. Thanks for any help provided.

images not loading in html using webpack

I'm having any issue loading images from a different folder than where my index.html file is located. Below is the message I am getting from the console.
GET http://localhost:3000/company-logo.jpg 404 (Not Found)
Here is my file directory
webpack.config.js
const currentTask = process.env.npm_lifecycle_event
const path = require('path')
const {CleanWebpackPlugin} = require('clean-webpack-plugin')
const MiniCssExtractPlugin = require('mini-css-extract-plugin')
const HtmlWebpackPlugin = require('html-webpack-plugin')
const fse = require('fs-extra')
const postCSSPlugins = [
require('postcss-import'),
require('postcss-simple-vars'),
require('postcss-nested'),
require('autoprefixer')
]
class RunAfterComile {
apply(compiler) {
compiler.hooks.done.tap('Copy images', function() {
fse.copySync('./public/images', './dist/public/images')
})
}
}
let cssConfig = {
test: /\.css$/i,
use: ['css-loader?url=false', {loader: 'postcss-loader', options: {plugins: postCSSPlugins}}]
}
let pages = fse.readdirSync('./views').filter(function(file) {
return file.endsWith('.html')
}).map(function(page) {
return new HtmlWebpackPlugin({
filename: page,
template: `./views/${page}`
})
})
let config = {
entry: './public/scripts/App.js',
plugins: pages,
module: {
rules: [
cssConfig
]
}
}
if (currentTask == 'dev') {
cssConfig.use.unshift('style-loader')
config.output = {
filename: 'bundled.js',
path: path.resolve(__dirname, 'public')
}
config.devServer = {
before: function(app, server) {
server._watch('./views/**/*.html')
},
contentBase: path.join(__dirname, './views'),
hot: true,
port: 3000
}
config.mode = 'development'
}
if (currentTask == 'build') {
config.module.rules.push({
test: /\.js$/,
exclude: /(node_modules)/,
use: {
loader: 'babel-loader',
options: {
presets: ['#babel/preset-env']
}
}
})
cssConfig.use.unshift(MiniCssExtractPlugin.loader)
postCSSPlugins.push(require('cssnano'))
config.output = {
filename: '[name].[chunkhash].js',
chunkFilename: '[name].[chunkhash].js',
path: path.resolve(__dirname, 'dist')
}
config.mode = 'production'
config.optimization = {
splitChunks: {chunks: 'all'}
}
config.plugins.push(
new CleanWebpackPlugin(),
new MiniCssExtractPlugin({filename: 'styles.[chunkhash].css'}),
new RunAfterComile()
)
}
module.exports = config
The css works perfectly fine. I seem to only be having problems with images.
I tried the following file paths but they didn't work. I think I am missing something.
index.html
<img src="./company-logo.jpg" alt="dfgadfg">
<img src="../public/images/company-logo.jpg" alt="dfgadfg">
<img src="./images/company-logo.jpg" alt="dfgadfg">
any help would be appreciated. Thank you very much.

Try use
module: {
rules: [
{
test: /\.(png|svg|jpg|gif)$/,
use: [
'file-loader',
],
},
],
},

You might require file-loder to get the images correctly served
rules: [
{
test: /\.(png|jpe?g|gif)$/i,
loader: 'file-loader',
options: {
outputPath: 'images' // Chage this like 'public/images' or any other relative path to the root
}
},
...
]
Try to inspect and check how the images are loading in Source tab of Developer Tools, change the outputPath accordingly.
Update
If images are still not loading to Source tab of browser, try importing it in your App.js (Entry point file)
....
import "../public/images/company-logo.jpg";
...

Unexpected token You may need an appropriate loader to handle this file type.importing strapi sdk

Hi I am trying to import javascript strapi sdk (link) in my new project which is configured using web pack
Here is my code yet
index.ts file
import * as $ from 'jquery';
import Strapi from 'strapi-sdk-javascript'
const strapi = new Strapi('http://localhost:1337')
here is my webpack.config.file
const path = require('path');
const HtmlWebpackPlugin = require('html-webpack-plugin');
const CleanWebpackPlugin = require('clean-webpack-plugin');
const webpack = require('webpack');
const UglifyJSPlugin = require('uglifyjs-webpack-plugin');
module.exports = {
entry: './src/index.ts',
module: {
rules: [
{
test: /\.js$/,
use:
{loader: 'babel-loader',
options: {
presets: ['env']
}
},
// include: [path.resolve(__dirname, "./src/app")],
exclude: /node_modules/
}
]
},
resolve: {
extensions: ['.tsx', '.ts', '.js'],
alias: {
$: "jquery/src/jquery",
}
},
devtool: 'inline-source-map',
devServer: {
contentBase: './dist'
},
plugins: [
new CleanWebpackPlugin(['dist']),
new HtmlWebpackPlugin({
template: 'src/assets/template.html'
})
],
output: {
filename: '[name].bundle.js',
path: path.resolve(__dirname, 'dist')
}
};
and this is giving my this error
what am i doing wrong here . please
help thanks in advance

You can try something like this
// Process JS with Babel.
{
test: /\.(js|jsx|mjs)$/,
include: [path.resolve(__dirname,"./src/app")path.resolve('node_modules/strapi-sdk-javascript')],
loader: require.resolve('babel-loader'),
},

Webpack throws TypeError: Super expression must either be null or a function, not undefined when importing LESS file

I have the following in a file initialize.js:
import App from './components/App';
import './styles/application.less';
document.addEventListener('DOMContentLoaded', () => {
const app = new App();
app.start();
});
In webpack.config.js I have:
'use strict';
const path = require('path');
const webpack = require('webpack');
const merge = require('webpack-merge');
const ProvidePlugin = webpack.ProvidePlugin;
const ModuleConcatenationPlugin = webpack.optimize.ModuleConcatenationPlugin;
const ExtractTextPlugin = require('extract-text-webpack-plugin');
const CopyWebpackPlugin = require('copy-webpack-plugin');
const extractLess = new ExtractTextPlugin({
filename: 'app.css',
});
const webpackCommon = {
entry: {
app: ['./app/initialize']
},
module: {
rules: [{
test: /\.js$/,
exclude: /node_modules/,
use: [{
loader: 'babel-loader?presets[]=es2015'
}]
}, {
test: /\.hbs$/,
use: {
loader: 'handlebars-loader'
}
}, {
test: /\.less$/,
exclude: /node_modules/,
use: extractLess.extract({
use: [{
loader: 'css-loader'
}, {
loader: 'less-loader'
}],
// use style-loader in development
fallback: 'style-loader'
}),
}]
},
output: {
filename: 'app.js',
path: path.join(__dirname, './public'),
publicPath: '/'
},
plugins: [
extractLess,
new CopyWebpackPlugin([{
from: './app/assets/index.html',
to: './index.html'
}]),
new ProvidePlugin({
$: 'jquery',
_: 'underscore'
}),
new ModuleConcatenationPlugin(),
],
};
module.exports = merge(webpackCommon, {
devtool: '#inline-source-map',
devServer: {
contentBase: path.join(__dirname, 'public'),
compress: true,
port: 9000
}
});
I tried removing the the plugins and the contents of application.less, but I keep getting this error:
ERROR in ./node_modules/css-loader!./node_modules/less-loader/dist/cjs.js!./app/styles/application.less
Module build failed: TypeError: Super expression must either be null or a function, not undefined
at ...
# ./app/styles/application.less 4:14-127
# ./app/initialize.js
If I replace that LESS file with a CSS one and update the config it works fine, so I guess the problem has to do with less-loader.
I'm using Webpack 3.4.1, Style Loader 0.18.2, LESS Loader 4.0.5, Extract Text Webpack Plugin 3.0.0 and CSS Loader css-loader.

My bad, I didn't notice I was using an old less version. That was the culprit. Just updated it to 2.7.2 and the problem is gone.