Style css module not applied [React + Webpack] - reactjs

I am discovering the CSS modules in a react application, I also use Webpack.
I edit the webpack configuration file, I try to change the color of a paragraph using a css file to test but the style is not applied.
Visual studio code tells me that the module is not found but I have yet entered the correct path of the file.
I think it's a problem with the webpack configuration file.
I did a lot of research, I tried different solutions ...
I thank you in advance for your help and your answers
I tried to follow the tutorial of this site => https://javascriptplayground.com/css-modules-webpack-react/
I did research on stack overflow, I try several solutions proposed in the different posts but it still does not work.
I then check with the webpack documentation to add the loaders "style-loader" and "css-loader"
Webpack configuration file
module.exports = {
entry: [
'./src/index.js'
],
output: {
path: __dirname,
publicPath: '/',
filename: 'bundle.js'
},
module: {
rules: [
{
enforce: 'pre',
test: /\.js$/,
loader: 'standard-loader',
exclude: /node_modules/
}, {
test: /\.js$/,
loader: 'babel-loader',
exclude: /node_modules/
}, {
test: /\.css$/,
use: ['style-loader', 'css-loader' ]
}
],
loaders: [{
exclude: /node_modules/,
loader: 'babel',
query: {
presets: ['react', 'es2015', 'stage-1']
}
},{
test: /\.css$/,
loader: "style-loader!css-loader"
}
]
},
resolve: {
extensions: ['', '.js', '.jsx','css']
},
devServer: {
historyApiFallback: true,
contentBase: './'
}
};
File CSS
.title {
color: yellow;
font-size: 124px;
}
Test code snippet
import styles from './home.css';
<p className={styles.title}>hello world</p>
I want to change the color of a paragraph, using a CSS module but the style does not apply to the refresh of the page.

Related

Prefix React className

So, I need to prefix my react components classNames so it doesn't conflict with global classes.
And no, I can't use CSS modules because of how my yarn workspaces are built
So, if I have a button class I would like it to become my_app-button
<button className="button">Hello StackOverflow</button>
to
<button className="my-app_button">Hello StackOverflow</button>
PostCSS does that for me in the CSS part, but on the React Side I wasn't able to find a solution
All of my components use typescript
I've tried using a webpack loader to do the job, and it did! But only on my Storybook server, when I used it with my separate webpack config it didn't work
The only error that is given to me is invariant 85
This is my Webpack Config, alongside the webpack loader and the babel-loader
import { Configuration, ProgressPlugin } from 'webpack'
const config: Configuration = {
mode: 'production',
entry: './src/index.ts',
target: 'node',
output: {
filename: '[name].js',
path: __dirname + '/dist',
publicPath: '',
},
resolve: {
extensions: ['.js', '.jsx', '.ts', '.tsx'],
},
module: {
rules: [
{
test: /\.jsx?$/,
exclude: /node_modules/,
use: [
{
loader: 'babel-loader',
options: {
presets: ['#babel/preset-react', '#babel/preset-env', 'minify'],
},
},
],
},
{
test: /\.tsx?$/,
exclude: /node_modules/,
use: [
{
loader: 'babel-loader',
options: {
presets: [
'#babel/preset-react',
'#babel/preset-env',
'#babel/preset-typescript',
'minify',
],
},
},
],
},
{
test: /\.tsx$/,
exclude: /node_modules/,
use: [
{
loader: 'react-classname-prefix-loader?prefix=giffy_css',
},
],
},
{
test: /\.(png|jpe?g|gif)$/,
exclude: /node_modules/,
use: [{ loader: 'file-loader' }],
},
],
},
plugins: [new ProgressPlugin()],
}
export default config
and just in case you need it, this is my Storybook webpack configuration
webpackFinal: async (config, { configType }) => {
config.module.rules.push({
test: /\.tsx$/,
exclude: /node_modules/,
use: [
{
loader: 'react-classname-prefix-loader?prefix=giffy_css',
},
],
})
// console.log(config.module.rules[0].use[0].options.overrides[0])
return config
}
i have also tried first compiling my components with babel and then using webpack
i tried searching for an equivalent webpack loader in babel, but could not find it

How to properly load CSS from an external module in React?

In my react.js app I am trying to use an external module (React Toastify)
using the following statement:
import { ToastContainer, toast } from 'react-toastify';
import 'react-toastify/dist/ReactToastify.css';
Unfortunately this throws the following error:
Uncaught Error: Module parse failed: Unexpected token (1:0)
You may need an appropriate loader to handle this file type.
> .Toastify__toast-container {
| z-index: 9999;
I guess it has something to do with webpack, here are my settings in webpack.config.js:
output: {
filename: '[name].js',
path: path.resolve(__dirname, 'assets'),
},
devtool: production ? '' : 'source-map',
resolve: {
extensions: [".js", ".jsx", ".json"],
},
module: {
rules: [
{
test: /\.jsx?$/,
exclude: /node_modules/,
loader: 'babel-loader',
},
],
},
};
I am not sure how this can be fixed, any advice appreciated.
In your webpack config file you have add the css loader test:
module: {
rules: [
{
test: /\.jsx?$/,
exclude: /node_modules/,
loader: 'babel-loader',
}, {
test: /\.css$/,
use: ['style-loader', 'css-loader'],
},
],
},
And don't forget to install it with npm i -D css-loader.
More info here: https://github.com/webpack-contrib/css-loader

Webpack config script is not working

I'm using webpack config for my react.js application. When i run the command npm run build my images and font files are not build under media directory as i defined in my webpack:
module.exports = {
entry: {
app: ['./app/main.js']
},
output: {
path: path.resolve(process.cwd(), 'dist'),
publicPath: '/',
filename: 'bundle.js'
},
module: {
preLoaders: [
{
test: /.jsx?$/,
exclude: /node_modules/,
loader: 'eslint-loader'
},
],
loaders: [
{
test: /.jsx?$/,
loader: 'babel-loader',
exclude: /node_modules/,
query: {
presets: ['es2015', 'react'],
plugins: [
'transform-runtime',
'transform-object-rest-spread'
]
}
},
{
test: /\.(css|scss)$/,
loaders: ['style', 'css', 'sass']
},
{
test: /\.(eot|woff|woff2|svg|ttf|png|jpg|gif)([\?]?.*)$/,
loader: 'file-loader',
options: {
name: 'media/[name].[ext]'
}
},
{
test: /\.html$/,
loader: 'html'
},
{ // Load JSON-files into code base.
test: /\.json$/,
exclude: /node_modules/,
loader: 'json',
},
]
},
plugins: getPlugins(),
devtool: 'source-map',
};
But the files are placed just inside my dist. What am i missing?
That is the right behaviour. webpack outputs everything fist for your output path, then from that it starts to create folders for loaders. You can't have javascript under /dist and force it to output all other files to /media. It is always going to be everything under your dist.

Webpack 2 - Cannot create property 'mappings' on string

Migrating from a working Webpack v1 config to Webpack 2. But running into an error while trying to run the build:
ERROR in ./src/index.jsx
Module build failed: TypeError: /home/pierce/Projects/my-js-app/src/index.jsx: Cannot create property 'mappings' on string
I have updated my loaders to match the new format:
module: {
rules: [
{
test: /\.(js|jsx)$/,
exclude: /node_modules/,
loader: "babel-loader"
},
{
test: /\.(jpg|png)$/,
loader: 'file-loader',
query: {
name: '[path][name].[hash].[ext]',
},
},
{
test: /\.css$/,
loader: "style-loader!css-loader"
},
{
test: /\.scss$/,
use: [
{
loader: 'style-loader'
},
{
loader: 'css-loader'
},
{
loader: 'sass-loader',
options: { sourceMap: true }
}
]
},
{
test: /\.(woff|woff2|eot|ttf|svg)(\?v=\d+\.\d+\.\d+)?/,
loader: 'url-loader',
query: {
limit: 100000
}
},
{
test: /\.icon-svg$/,
use: [{loader:'babel-loader'}, {loader: 'svg-react-loader'}]
},
// Bootstrap 3
{
test: /bootstrap-sass\/assets\/javascripts\//,
loader: 'imports-loader?jQuery=jquery'
}
]
},
It's as if something is not being compiled the way it was before, therefore causing a TypeError.
Turns out I was babelifing twice.
If you're also splitting your webpack.config.js into separate files for your different environments, be sure that webpack.dev.config.js does not include a babel-loader entry if your webpack.base.config.js does.
Otherwise, if you use the loader twice the 2nd time around will cause an error. This wasn't a Webpack 2 error but a webpack splitting-configs-and-missing-a-small-thing error
Encountered a similar issue in my compilation. Found out that I was using babel loader for .js and .jsx both.
Removed .jsx and its working as expected.
A snippet of my webpack.config.js looks like this.
{
test: /\.js$/,
exclude: [/(node_modules)/],
use: [
{
loader: 'react-hot-loader'
},
{
loader: 'babel-loader',
options: {
presets: ['react', 'es2015', 'stage-0'],
plugins: [
'transform-class-properties',
'transform-decorators-legacy'
]
}
}
]
}
In case someone else is having the same issue, I had to remove the following from loader for it to work
{
test: /\.jsx?$/,
use: ['react-hot-loader/webpack']
}
In my case it helped when I removed devtool: 'inline-source-map' from webpack

Webpack, React, Babel - Cannot Resolve module

I have installed react-hot-loader and referenced the module in the webpack.config.js. However when i try to run webpack to compile the scripts, i get an error.
Please see below screen shot. Could someone please advise of what the issue could be. FYI, i am using all the latest libraries.
[1]: http://i.stack.imgur.com/2GCa1.jpg
/*webpack.config.js
module.exports = {
devtool: 'eval-source-map',
entry: {
main: [
'./src/main.js'
]
},
output: {
filename: './public/[name].js'
},
module: {
loaders: [
{
test: /\.jsx?$/,
exclude: /node_modules/,
loader: ['react-hot','babel-loader'],
query: {
presets: ['es2015', 'react']
}
}
]
}
}
/*UPDATE*/
Code update
I have added an "s" after loader. It is now giving me the below error.
[2]: http://i.stack.imgur.com/LL1nn.jpg
Based on your second picture, you could try the following:
loaders: [
{
test: /\.jsx?$/,
exclude: /node_modules/,
loader: ['react-hot'],
},
{
test: /\.jsx?$/,
exclude: /node_modules/,
loader: ['babel-loader'],
query: {
presets: ['es2015', 'react']
}
}
]
I've created a starter with webpack, babel and react-hot-loader. Please have a look into my config: https://github.com/skrobek/webpack-react/blob/master/webpack.config.js
and package.json https://github.com/skrobek/webpack-react/blob/master/package.json#L19
Feel free to use it :-)

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