React hot loader not realoading after changes - reactjs

I have the following webpack.config.js :
"use strict";
const debug = process.env.NODE_ENV !== "production";
const webpack = require('webpack');
const path = require('path');
module.exports = {
devtool: debug ? 'inline-sourcemap' : null,
devServer: {
inline: true,
port: 3333,
hot: true,
contentBase: "src/static/",
historyApiFallback: {
index: '/index-static.html'
}
},
entry: [
'webpack-dev-server/client?http://localhost:3000/',
'webpack/hot/only-dev-server',
'./src/app-client.js'
],
output: {
path: path.join(__dirname, 'src', 'static', 'js'),
publicPath: "/js/",
filename: 'bundle.js'
},
module: {
loaders: [{
test: path.join(__dirname, 'src'),
loader: ['babel-loader'],
query: {
cacheDirectory: 'babel_cache',
presets: debug ? ['react', 'es2015', 'react-hmre'] : ['react', 'es2015']
}
},
{ test: /\.jsx?$/, loaders: ['react-hot', 'jsx?harmony'], include: path.join(__dirname, 'src') }
]
},
plugins: debug ? [] : [
new webpack.DefinePlugin({
'process.env.NODE_ENV': JSON.stringify(process.env.NODE_ENV)
}),
new webpack.optimize.DedupePlugin(),
new webpack.optimize.OccurenceOrderPlugin(),
new webpack.HotModuleReplacementPlugin(),
new webpack.optimize.UglifyJsPlugin({
compress: { warnings: false },
mangle: true,
sourcemap: false,
beautify: false,
dead_code: true
}),
]
};
package.json
{
"name": "judo-heroes",
"version": "1.0.0",
"description": "Simple application to showcase how to achieve universal rendering and routing with React and Express.",
"main": "src/server.js",
"repository": "git#github.com:lmammino/judo-heroes.git",
"scripts": {
"start": "NODE_ENV=development node_modules/.bin/babel-node --presets 'react,es2015' src/server.js",
"start-dev": "npm run start-dev-hmr",
"start-dev-single-page": "node_modules/.bin/http-server src/static",
"start-dev-hmr": "node_modules/.bin/webpack-dev-server --progress --inline --hot",
"build": "NODE_ENV=development node_modules/.bin/webpack -d"
},
"author": "Luciano Mammino",
"license": "MIT",
"dependencies": {
"babel-cli": "^6.11.4",
"babel-core": "^6.13.2",
"babel-loader": "^6.2.5",
"babel-plugin-react-html-attrs": "^2.0.0",
"babel-preset-es2015": "^6.13.2",
"babel-preset-react": "^6.11.1",
"babel-preset-react-hmre": "^1.1.1",
"ejs": "^2.5.1",
"express": "^4.14.0",
"react": "^15.3.1",
"react-dom": "^15.3.1",
"react-router": "^2.6.1"
},
"devDependencies": {
"http-server": "^0.9.0",
"react-hot-loader": "^1.3.0",
"webpack": "^1.13.2",
"webpack-dev-server": "^1.14.1"
}
}
I am trying to get the browser to refresh every time I make changes to some of the components, but the changes don't take place.

Your issue is probably that you don't get to the loader with test test: /\.jsx?$/, since the first loader matches.
Can you try to use react-hot in the first module?
{
test: path.join(__dirname, 'src'),
loader: ['react-hot','babel-loader'],
query: {
cacheDirectory: 'babel_cache',
presets: debug ? ['react', 'es2015', 'react-hmre'] : ['react', 'es2015']
}
},
A more precise test for this loader would be better in the long run though.

I simply had to run this command:
"start-dev-hmr": "node_modules/.bin/webpack-dev-server --progress --inline --hot",
from
{
"name": "judo-heroes",
"version": "1.0.0",
"description": "Simple application to showcase how to achieve universal rendering and routing with React and Express.",
"main": "src/server.js",
"repository": "git#github.com:lmammino/judo-heroes.git",
"scripts": {
"start": "NODE_ENV=production node_modules/.bin/babel-node --presets 'react,es2015' src/server.js",
"start-dev": "npm run start-dev-hmr",
"start-dev-single-page": "node_modules/.bin/http-server src/static",
"start-dev-hmr": "node_modules/.bin/webpack-dev-server --progress --inline --hot",
"build": "NODE_ENV=production node_modules/.bin/webpack -p"
},
"author": "Luciano Mammino",
"license": "MIT",
"dependencies": {
"babel-cli": "^6.11.4",
"babel-core": "^6.13.2",
"babel-loader": "^6.2.5",
"babel-plugin-react-html-attrs": "^2.0.0",
"babel-preset-es2015": "^6.13.2",
"babel-preset-react": "^6.11.1",
"babel-preset-react-hmre": "^1.1.1",
"ejs": "^2.5.1",
"express": "^4.14.0",
"react": "^15.3.1",
"react-dom": "^15.3.1",
"react-router": "^2.6.1"
},
"devDependencies": {
"http-server": "^0.9.0",
"react-hot-loader": "^1.3.0",
"webpack": "^1.13.2",
"webpack-dev-server": "^1.14.1"
}
}

Related

Webpack live reload says "nothing changed" even if I modify a file. Why?

I have a react project and I'm using Webpack (webpack-dev-server) for my development.
Everything compiles well, and when I make a change in my file (for the first time), the live reloading works well.
BUT, after changing the same file twice (or more), the live reloading stop working. In the console it says "nothing changed" even when I made a change.
Looks like the webpack-dev-server memory doesn't pick up the change. Any idea why?
Webpack Config
const path = require("path");
const HtmlWebpackPlugin = require("html-webpack-plugin");
const { ProvidePlugin } = require("webpack");
module.exports = {
target: "web",
mode: "development",
entry: ["regenerator-runtime/runtime.js", "./src/index.js"],
devtool: "inline-source-map",
devServer: {
historyApiFallback: true,
hot: true,
port: 8080,
static: "./dist",
watchFiles: "src/**/*,js",
},
output: {
path: path.resolve(__dirname, "dist"),
filename: "index_bundle.js",
},
resolve: { extensions: ["*", ".js", ".jsx"] },
module: {
rules: [
{
test: /\.(jsx|js)$/,
exclude: /(node_modules)/,
use: [
{
loader: "babel-loader",
options: {
presets: ["#babel/env", "#babel/react"],
},
},
],
},
{
test: /\.css$/,
// exclude: /node_modules/,
use: ["style-loader", "css-loader"],
},
{
test: /\.svg$/,
use: [
{
loader: "svg-url-loader",
options: {
limit: 10000,
},
},
],
},
],
},
plugins: [
new HtmlWebpackPlugin({
template: "src/index.html",
title: "Development",
}),
new ProvidePlugin({
React: "react",
}),
],
};
Package.json
{
"name": "timerfrontend",
"version": "1.0.0",
"main": "index.js",
"babel": {
"presets": [
"#babel/preset-env",
"#babel/preset-react"
]
},
"scripts": {
"test": "echo \"Error: no test specified\" && exit 1",
"start": "webpack serve",
"create": "webpack -w",
"build": "webpack -p"
},
"keywords": [],
"author": "",
"license": "ISC",
"devDependencies": {
"#babel/core": "^7.16.5",
"#babel/preset-env": "^7.16.5",
"#babel/preset-react": "^7.16.5",
"babel-loader": "^8.2.3",
"css-loader": "^6.5.1",
"html-webpack-plugin": "^5.3.1",
"style-loader": "^3.3.1",
"webpack": "^5.65.0",
"webpack-cli": "^4.9.1",
"webpack-dev-server": "^4.6.0"
},
"dependencies": {
"#apollo/client": "^3.5.6",
"#apollo/link-context": "^2.0.0-beta.3",
"#apollo/react-hooks": "^4.0.0",
"#auth0/auth0-react": "^1.8.0",
"apollo-cache-inmemory": "^1.6.6",
"apollo-client": "^2.6.10",
"apollo-link-http": "^1.5.17",
"bootstrap": "^5.0.1",
"dayjs": "^1.10.5",
"npm-force-resolutions": "^0.0.10",
"prop-types": "^15.7.2",
"react": "^17.0.2",
"react-dom": "^17.0.2",
"react-router-dom": "^6.1.1",
"regenerator-runtime": "^0.13.9",
"svg-url-loader": "^7.1.1"
},
"description": "",
"resolutions": {
"react": "17.0.2",
"graphql": "16.1.0"
}
}
I found the solution (hint: its weird)
I realized that my Webpack live reloading was working on my other components (except the I had issue with).
I finally resolved to deleting that component and create a new one (exact copy) and then it worked perfectly!?
I still don't know why Webpack didn't like this component specifically...
It was happening to me, I checked the files and class names, they have to be exactly the same, including caps and lowercase letters
In my case, the file I was modified is not being use anywhere in project, so webpack does not recognize it.
After import and use it in the code, then it work fine

React Class properties not building with Webpack and Babel

I am trying to tidy some React code by using a static property of the class something like
class X extends React.Component {
static counter = 0
...
render() {
return( <div>{X.counter}</div>)
}
}
The build fails with unexpected token static counter = 0
My .babelrc is
{
"plugins": ["transform-class-properties", "transform-react-jsx" ]
}
and my package.json (using Webpack to build) is ...
{
"name": "js",
"version": "1.0.0",
"main": "index.js",
"license": "MIT",
"devDependencies": {
"babel-core": "^6.26.3",
"babel-loader": "^7.1.4",
"babel-plugin-transform-class-properties": "^6.24.1",
"babel-preset-latest": "^6.24.1",
"babel-preset-react": "^6.24.1",
"react": "^16.4.1",
"react-dom": "^16.4.1",
"webpack": "^4.12.2",
"webpack-dev-server": "^3.1.4"
},
"scripts": {
"dev": "webpack-dev-server --inline --hot --no-info --env dev",
"build:prod": "webpack --env prod --progress --profile --colors",
"build:dev": "webpack --env dev --progres --profile --colors"
},
"dependencies": {
"css-loader": "^1.0.0",
"react-meter-bar": "^1.0.2",
"react-modal": "^3.5.1",
"react-websocket": "^2.0.0",
"style-loader": "^0.21.0",
"webpack-cli": "^3.0.8"
}
}
Can anyone help ?
I solved the issue by adding the plugin to the Webpack.config.js and using babel-loader - this is probably due to my lack of knowledge how Webpack works ...
const path = require('path');
module.exports = {
mode: 'development',
context: path.join(__dirname, 'src'),
entry: [
'./app.js',
],
output: {
path: path.join(__dirname, 'dist'),
filename: 'bundle.js',
},
module: {
rules: [
{
test: /\.js$/,
exclude: /node_modules/,
use: [
{
loader: 'babel-loader',
options: {
presets:['react'],
plugins: ["transform-class-properties"]
}
}
],
},
{
test:/\.css$/,
use:['style-loader','css-loader'],
},
],
},
resolve: {
modules: [
path.join(__dirname, 'node_modules'),
],
},
};

Bundle.js file isn't getting generated by webpack for production build

I'm unable to generate the bundle.js file.
This is my webpack.config.js.
module.exports = {
entry: [
'./src/index.js'
],
output: {
path: __dirname,
publicPath: '/',
filename: 'bundle.js'
},
module: {
loaders: [{
exclude: /node_modules/,
loader: 'babel',
query: {
presets: ['react', 'es2015', 'stage-1']
}
}]
},
resolve: {
extensions: ['', '.js', '.jsx']
},
devServer: {
historyApiFallback: true,
contentBase: './'
}
};
This is my package.json
{
"name": "redux-react",
"version": "1.0.0",
"description": "",
"main": "index.js",
"scripts": {
"start": "node ./node_modules/webpack-dev-server/bin/webpack-dev-server.js",
"test": "mocha --compilers js:babel-core/register --require ./test/test_helper.js --recursive ./test",
"test:watch": "npm run test -- --watch"
},
"author": "",
"license": "ISC",
"devDependencies": {
"babel-core": "^6.2.1",
"babel-loader": "^6.2.0",
"babel-preset-es2015": "^6.1.18",
"babel-preset-react": "^6.1.18",
"chai": "^3.5.0",
"chai-jquery": "^2.0.0",
"jquery": "^2.2.1",
"jsdom": "^8.1.0",
"mocha": "^2.4.5",
"react-addons-test-utils": "^0.14.7",
"webpack": "^1.12.9",
"webpack-dev-server": "^1.14.0"
},
"dependencies": {
"babel-preset-stage-1": "^6.1.18",
"lodash": "^3.10.1",
"react": "^0.14.3",
"react-dom": "^0.14.3",
"react-redux": "4.3.0",
"react-router": "^2.0.1",
"redux": "^3.0.4"
}
}
The main aim is to build a production-ready app hence how do I configure my webpack to generate the bundle.js file. Also is it necessary to have seperate webpack.config for dev and production server?
webpack-dev-server is for development purpose. This will not put your bundle.js in your work directory, it will compile your files in-memory.
I can see from your package scripts that you are running a webpack-dev-server to build the code

Bundle file output not regenerated without build errors

New to webpack trying to understand how to make file structure, webpack.config.js and package.json work together, but not sure what is failing as the client.min.js(my outputted bunfdle file) is never regenerated upon NPM run dev
webpack.config.js:
var debug = process.env.NODE_ENV !== "production";
var webpack = require('webpack');
var path = require('path');
module.exports = {
context: path.join(__dirname, "src"),
devtool: debug ? "inline-sourcemap" : null,
entry: "./js/client.js",
module: {
loaders: [
{
test: /\.jsx?$/,
exclude: /(node_modules|bower_components)/,
loader: 'babel-loader',
query: {
presets: ['react', 'es2015', 'stage-0'],
plugins: ['react-html-attrs', 'transform-class-properties', 'transform-decorators-legacy'],
}
}
]
},
output: {
path: __dirname+"/src/",
filename: "client.min.js"
},
plugins: debug ? [] : [
new webpack.optimize.DedupePlugin(),
new webpack.optimize.OccurenceOrderPlugin(),
new webpack.optimize.UglifyJsPlugin({ mangle: false, sourcemap: false }),
],
};
package.json:
{
"name": "appThing",
"version": "0.0.0",
"main": "webpack.config.js",
"dependencies": {
"babel-core": "^6.18.2",
"babel-loader": "^6.2.0",
"babel-plugin-add-module-exports": "^0.1.2",
"babel-plugin-react-html-attrs": "^2.0.0",
"babel-plugin-transform-class-properties": "^6.3.13",
"babel-plugin-transform-decorators-legacy": "^1.3.4",
"babel-preset-es2015": "^6.3.13",
"babel-preset-react": "^6.3.13",
"babel-preset-stage-0": "^6.3.13",
"flux": "^2.1.1",
"history": "^1.17.0",
"react": "^0.14.6",
"react-dom": "^0.14.6",
"react-router": "^1.0.3",
"webpack": "^2",
"webpack-dev-server": "^2"
},
"scripts": {
"dev": "webpack-dev-server --content-base src --inline --hot"
},
"author": "",
"license": "ISC",
"devDependencies": {
"webpack": "^2.7.0",
"webpack-cli": "^2.0.10"
},
"description": ""
}
File structure:
NPM run dev result:
webpack-dev-server does not generate files. It serves all assets from memory.
If you want to generate files, run webpack.

React via Webpack - Production flag increases file size

I'm pretty new to using React and Webpack so I'm likely doing something wrong, but when I build with the -p production flag my file size is considerably bigger (3.26MB vs 2.23MB) than when I build without.
package.json:
{
"name": "myProject",
"version": "0.0.1",
"description": "",
"main": "webpack.config.js",
"dependencies": {
"babel-loader": "^6.2.0",
"babel-plugin-add-module-exports": "^0.1.2",
"babel-plugin-react-html-attrs": "^2.0.0",
"babel-plugin-transform-class-properties": "^6.3.13",
"babel-plugin-transform-decorators-legacy": "^1.3.4",
"babel-preset-es2015": "^6.3.13",
"babel-preset-react": "^6.3.13",
"babel-preset-stage-0": "^6.3.13",
"flux": "^2.1.1",
"history": "^1.17.0",
"react": "^0.14.6",
"react-dom": "^0.14.6",
"react-router": "^1.0.3",
"webpack": "^1.12.9",
"webpack-dev-server": "^1.14.1"
},
"devDependencies": {},
"scripts": {
"dev": "webpack-dev-server --content-base src --inline --hot",
"build": "webpack",
"build-p": "webpack -p"
},
"author": ""
}
webpack.config.js:
var debug = process.env.NODE_ENV !== "production";
var webpack = require('webpack');
var path = require('path');
module.exports = {
context: path.join(__dirname, "src"),
devtool: debug ? "inline-sourcemap" : null,
entry: "./js/app.js",
module: {
loaders: [
{
test: /\.jsx?$/,
exclude: /(node_modules|bower_components)/,
loader: 'babel-loader',
query: {
presets: ['react', 'es2015', 'stage-0'],
plugins: ['react-html-attrs', 'transform-class-properties', 'transform-decorators-legacy'],
}
}
]
},
output: {
path: __dirname + "/src/",
filename: "app.min.js"
},
plugins: debug ? [] : [
new webpack.optimize.DedupePlugin(),
new webpack.optimize.OccurenceOrderPlugin(),
new webpack.optimize.UglifyJsPlugin({ mangle: false, sourcemap: false }),
],
};
I had the same problem and it got solved by removing the 'debug' property from webpack.conf.js. In stead I call webpack with the -d flag when I'm developing (and not when building the production bundle), as that adds the debug property automatically.
I see that debug is a conditional in your config, but at least it solved the problem for me.

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