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How to remove react from build from custom component?

I am learning how to make custom component or library and publish on npm. I found a free tutorial here:
https://www.udemy.com/course/your-custom-react-component/learn/lecture/13561884#overview
github link
https://github.com/davidcsejtei/custom-button
But I am facing one problem .he created a simple component custom button
import React, { Component } from 'react';
import '../style/button.scss';
export default class CustomButton extends Component {
render() {
return(
<button>Custom button</button>
);
}
}
but when we create a build it include react library in his build so now it's size increase to 7.5kb.It should be below 2kb as it is small component and it is used in another project
In other ways custom component use react dependency from there parent component . Can we remove this react dependency in build ?
Here is the webpack config:
const webpack = require('webpack');
const path = require('path');
const UglifyJsPlugin = require('uglifyjs-webpack-plugin');
const CleanWebpackPlugin = require('clean-webpack-plugin');
module.exports = {
mode: 'production',
entry: './src/index.js',
output: {
filename: 'custom-button.js',
library: 'custom-button',
libraryTarget: 'umd',
path: path.resolve(__dirname, 'dist')
},
module: {
rules: [
{
test: /\.js$/,
exclude: /node_modules/,
use: {
loader: 'babel-loader',
options: {
presets: ["#babel/preset-env", "#babel/preset-react"]
}
}
},
{
test: /\.scss$/,
use: [
{
loader: 'style-loader'
},
{
loader: 'css-loader'
},
{
loader: 'sass-loader'
}
]
}
]
},
optimization: {
minimizer: [new UglifyJsPlugin()]
},
plugins: [
new CleanWebpackPlugin(['dist'])
]
}
any update ?

In order to exclude react out of your build with webpack, you just simply declare externals in your configuration like below:
externals: {
react: "react",
}
As you output with your umd module above, it will require react as the dependency in the build which means it will consume the react at the parent (consuming) repo:
(function webpackUniversalModuleDefinition(root, factory) {
if(typeof exports === 'object' && typeof module === 'object')
module.exports = factory(require("react"));
// ...

Why does this basic webpack hot module replacement work?

I tried the very basic HMR(without react-hot-loader) using webpack after reading this Medium post by Dan Abramov.
Entry index.js
import React from 'react';
import { render } from 'react-dom';
import App from './App';
if(module.hot) {
// Basic HMR for React without using react-loader
// module.hot.accept('./App', () => {
// const UpdatedApp = require('./App').default;
//
// render(<UpdatedApp />, document.getElementById('app'));
// });
// Why does this work as well?
module.hot.accept();
}
render(<App />, document.getElementById('app'));
The webpack config
const path = require('path');
const HtmlWebpackPlugin = require('html-webpack-plugin');
const webpack = require('webpack');
module.exports = {
entry: [
'webpack-dev-server/client?http://localhost:8081',
'webpack/hot/only-dev-server',
'./src/js/index.js'
],
output: {
path: path.join(__dirname, 'dist'),
filename: 'bundle.js'
},
module: {
rules: [
{
test: /\.jsx?$/,
exclude: /node_modules/,
use: [{ loader: 'babel-loader' }]
}
]
},
plugins: [
new HtmlWebpackPlugin({ template: 'src/index.html' }),
new webpack.HotModuleReplacementPlugin(),
new webpack.NamedModulesPlugin()
],
devServer: {
hot: true
}
}
My question is that, why does HMR for React app works with just module.hot.accept()?
As per my understanding, webpack's HMR only provides a simple API to detect changes in files. How to handle those changes depends on the loaders. The style-loader handles .css files. And, in context of a React app, the changes to .js modules might be managed by react-hot-loader.
Or, as per the Medium post, one can manage them like this:
render(<UpdatedApp />, document.getElementById('app'))
So why just doing module.hot.accept() gives same result as doing render(<UpdatedApp />, document.getElementById('app'))?
Package verisons
"webpack": "^3.10.0",
"webpack-dev-server": "^2.9.7"

How to use React.js with AdonisJs

How can I use React.js in the front-end of my AdonisJs project?
I've tried to install react with npm install react I thought this will works correctly. I made a file app.js with this code:
var React = require('react');
var ReactDOM = require('react-dom');
export default class Index extends Component {
render() {
return (< h1 > hello world! < /h1>)
}
}
ReactDOM.render( < Index / > , document.getElementById('example'))
But this isn't working at all, I don't know what to do more I have searched about how to use React in Adonis but I didn't find anything interesting.

I strongly suggest you to use WebPack for this task.
create a webpack.config.js file in your root directory:
maybe your code need some changes but this is the idea:
const webpack = require('webpack');
var CopyWebpackPlugin = require('copy-webpack-plugin');
var HtmlWebpackPlugin = require('html-webpack-plugin');
var ExtractTextPlugin = require('extract-text-webpack-plugin');
var path = require('path');
var pkgBower = require('./package.json');
module.exports = {
target: "web",
devtool: "source-map",
node: {
fs: "empty"
},
entry: {
'app': path.join(__dirname, 'react-app', 'Index.jsx')
},
resolve: {
modules: [__dirname, 'node_modules', 'bower_components'],
extensions: ['*','.js','.jsx', '.es6.js']
},
output: {
path: path.join(__dirname, 'public', 'src'),
filename: '[name].js'
},
resolveLoader: {
moduleExtensions: ["-loader"]
},
module: {
loaders: [
{
test: /jquery\.flot\.resize\.js$/,
loader: 'imports?this=>window'
},
{
test: /\.jsx?$/,
exclude: /(node_modules|bower_components)/,
loader: 'babel-loader',
query: {
presets: ['es2015', 'react', 'stage-0'],
compact: false
}
},
{
test: /\.css$/,
use: ExtractTextPlugin.extract({
fallback: "style-loader",
use: "css-loader"
})
},
{
test: /\.woff|\.woff2|\.svg|.eot|\.ttf/,
loader: 'url?prefix=font/&limit=10000'
},
{
test: /\.(png|jpg|gif)$/,
loader: 'url?limit=10000'
},
{
test: /\.scss$/,
loader: 'style!css!sass?outputStyle=expanded'
}
]
},
plugins: [
new ExtractTextPlugin("styles.css"),
new webpack.DefinePlugin({
'process.env.NODE_ENV': JSON.stringify(process.env.NODE_ENV)
}),
new CopyWebpackPlugin([{
from: 'img',
to: 'img',
context: path.join(__dirname, 'react-app')
}, {
from: 'server',
to: 'server',
context: path.join(__dirname, 'react-app')
}, {
from: 'fonts',
to: 'fonts',
context: path.join(__dirname, 'react-app')
}]),
new webpack.ProvidePlugin({
$: 'jquery',
jQuery: 'jquery',
'window.jQuery': 'jquery'
}),
new webpack.optimize.DedupePlugin(),
new webpack.optimize.OccurrenceOrderPlugin(),
new webpack.optimize.UglifyJsPlugin({
compress: { warnings: false },
mangle: true,
sourcemap: false,
beautify: false,
dead_code: true
}),
new webpack.ContextReplacementPlugin(/\.\/locale$/, 'empty-module', false, /js$/)
]
};
Then put your app in your root directory, in a folder react-app/ and your components can go inside that folder:
For example your file: [Index.jsx]
import React from 'react';
import ReactDOM from 'react-dom';
class Index extends Component {
render() {
return (< h1 > hello world! < /h1>)
}
}
ReactDOM.render( < Index / > , document.getElementById('example'));
you don't need to export this Index component in this case, but in case you need to just use export default ComponentName at the end of your component file.
The next step is in your routes file (I'm using AdonisJS 4) but is very similar for the version 3.x
Route.any("*", ({ view, response }) => (
view.render('index')
))
Then your index (.njk, or .edge) file (under resources/views) should look something like this:
<html>
<head>
<link rel="stylesheet" href="/src/styles.css">
<script type="text/javascript" src="/src/app.js"></script>
</head>
<body>
<div id="example"></div>
</body>
</html>
--
You need to install some npm/ packages with npm or yarn,
and remember to run in another terminal window or tab,
webpack -d --watch --progress
Regards.

This works. You are missing React.Component.
var React = require('react');
var ReactDOM = require('react-dom');
export default class Index extends React.Component {
render() {
return (< h1 > hello world! < /h1>)
}
}
ReactDOM.render( < Index / > , document.getElementById('example'))
Alternatively you can use import React, {Component} from 'react'; if you want to use your code structure.

For decoupled use, just build your React app and copy the build to Adonis public folder.

Issue with Webpack using React

Sorry if this is a duplicate question. I can't seem to solve this or find an answer. I have a basic Webpack setup i'm working with in conjunction with React and Django. Basically I'm getting compilation error's when using webpack.
These two webpack files aren't loading properly, both below, and neither is this App module (I think it's the provider component from redux).
I think it may be something to do with a driver - or something very simple that I've missed. I would really appreciate the help as I've been trying to fix this for a long time now haha!
Thanks!!!
webpack.config.local.config.js
var path = require("path")
var webpack = require('webpack')
var BundleTracker = require('webpack-bundle-tracker')
var ip = 'localhost'
var config = require('./webpack.base.config.js')
config.devtool = "#eval-source-map"
config.entry = {
App1: [
'webpack-dev-server/client?http://' + ip + ':3000',
'webpack/hot/only-dev-server',
'./reactjs/App1',
],
}
config.output.publicPath = 'http://' + ip + ':3000' + '/assets/bundles/'
config.plugins = config.plugins.concat([
new webpack.HotModuleReplacementPlugin(),
new webpack.NoErrorsPlugin(),
new BundleTracker({filename: './webpack-stats-local.json'}),
new webpack.DefinePlugin({
'process.env': {
'NODE_ENV': JSON.stringify('development'),
'BASE_API_URL': JSON.stringify('https://'+ ip +':3000/api/v1/'),
}}),
])
config.module.loaders.push(
{ test: /\.js?$/, exclude: /node_modules/, loaders: ['react-hot', 'babel'] }
)
module.exports = config
webpack.base.config.js
var path = require("path")
var webpack = require('webpack')
module.exports = {
context: __dirname,
entry: {
// Add as many entry points as you have container-react-components here
App1: './reactjs/App1',
vendors: ['react']
},
output: {
path: path.resolve('./djreact/static/bundles/local/'),
filename: "[name]-[hash].js"
},
externals: [
], // add all vendor libs
plugins: [
new webpack.optimize.CommonsChunkPlugin('vendors', 'vendors.js'),
], // add all common plugins here
module: {
loaders: [
// js
{
test: /\.js$/,
exclude: /node_modules/,
loaders: ['babel'],
presets: ['es2015', 'react'],
},
// PNG
{
test : /\.(png|jpg|svg)$/,
include : path.join(__dirname, 'img'),
loader : 'url-loader?limit=30000&name=images/[name].[ext]'
},
{
test: /\.(ttf|eot|svg|woff(2)?)(\?[a-z0-9]+)?$/,
loader: 'file-loader'
},
// CSS
{
test: /\.scss$/,
include: path.join(__dirname, 'client'),
loader: 'style-loader!css-loader!sass-loader'
}
] // add all common loaders here
},
resolve: {
modulesDirectories: ['node_modules', 'bower_components'],
extensions: ['', '.js', '.jsx']
},
}
The App that is having some errors
App1.js
import React from "react"
import { render } from "react-dom"
import {
createStore,
compose,
applyMiddleware,
combineReducers,
} from "redux"
import { Router, Route, hashHistory, IndexRoute } from 'react-router'
import { Provider } from "react-redux"
import thunk from "redux-thunk"
import * as reducers from "./reducers"
import App1Container from "./containers/App1Container"
let finalCreateStore = compose(
applyMiddleware(thunk),
window.devToolsExtension ? window.devToolsExtension() : f => f
)(createStore)
let reducer = combineReducers(reducers)
let store = finalCreateStore(reducer)
class App1 extends React.Component {
render() {
return (
<Provider store={store}>
<Router history = {hashHistory}>
<Route path="/" component={Layout}>
<IndexRoute component = {App1Container}/>
</Route>
</Router>
<App1Container />
</Provider>
)
}
}
render(<App1/>, document.getElementById('App1'))
So here are the errors.
From webpack.local.config.js
From webpack.base.config.js

webpack.base.config.js => jsx syntax error, I think that is wrong babel settings
Can you share your .babelrc?
Usually, this file is as follows.
{
"presets": ["es2015","react"]
}

Unable to expose a component library in react with webpack and babel

I'm creating a small component library for react. Something that can be required like var Components = require('components'). This will have individual components, much like react-bootstrap does. I'm trying to use webpack with babel to compile this into an index.js file. The compilation went well. I published this to my local npm registry and installed it in one of my other projects. When I require it - require('components') - the require returns an empty object. Below is my folder structure
root
|- components
| |- ImageEditor.js
|
|- lib
| |- index.compiled.js (file compiled by webpack)
|
|- index.js (requires ./components/ImageEditor.js, entry point for webpack)
|- webpack.config.js
ImageEditor.js
import React from 'react';
import ReactDOM from 'react-dom';
import Canvas from './utils/canvas';
import '../stylesheets/imageeditor.scss';
class ImageManipulation extends React.Component {
static propTypes = {};
state = {
height: 200,
width: 200,
scale: 1.25
};
static defaultProps = {
color: [213, 214, 217, 0.6],
image: ""
};
...
render() {
return (
<div className="_react-image-manipulation">
<div className="_cover-box">
{ this.loadComponent() }
</div>
</div>
);
}
}
export default ImageManipulation;
index.js
import ImageEditor from './components/ImageEditor';
export default {
ImageEditor
};
webpack.config.js
var path = require('path');
var NODE_ENV = process.env.NODE_ENV || 'development';
var WebpackNotifierPlugin = require('webpack-notifier');
var UglifyJSPlugin = require("webpack/lib/optimize/UglifyJsPlugin");
var CleanWebpackPlugin = require("clean-webpack-plugin");
var commonPlugins = [
new WebpackNotifierPlugin({
title: 'Contour Components'
})
];
function getPlugins() {
if (NODE_ENV == 'prod') {
commonPlugins.push(new CleanWebpackPlugin(['lib/*']));
commonPlugins.push(new UglifyJSPlugin({
compress: {
warnings: false
}
}));
}
return commonPlugins;
}
module.exports = {
devtool: 'sourcemap',
entry: {
index: './index.js'
},
output: {
path: path.join(__dirname, 'public'),
filename: '[name].compiled.js'
},
plugins: getPlugins(),
module: {
loaders: [{
test: /\.js$/,
loader: 'babel',
query: {
cacheDirectory: true,
presets: ['es2015', 'stage-0', 'react'],
plugins: ['add-module-exports', "transform-class-properties"]
},
exclude: /node_modules/
}, {
test: /\.json$/,
loader: 'json-loader'
}, {
test: /\.png$/,
loader: "url-loader?limit=100000&mimetype=image/png"
}, {
test: /(\.scss|\.css)$/,
include: /components/,
loader: 'style!css!sass'
}]
},
resolve: {
extensions: ['', '.scss', '.js', '.json', '.png'],
modulesDirectories: [
'node_modules',
'components'
]
}
};
Any idea what I'm doing wrong here?

You are exporting component in the object in the default export.
Babel 6 produces the following CommonJS module for you. See REPL:
exports.default = {
ImageEditor: ImageEditor
};
Then you can use this component like this:
var ImageEditor = require('my-lib').default.ImageEditor
Your component is hidden under the default key. If you don't want it, use named exports instead.
export {ImageEditor};
For this, Babel produces the following code
exports.ImageEditor = ImageEditor;
Look, no extra default key, and everything work as expected