Webpack Dev Server doesn't hot reload, requires manual webpack build - javascript

Here is some example render code in a child component of a small react app:
<React.Fragment>
<h1>From Tab Section</h1>
<h2>update 2</h2> // doesn't display in the browser
<p>update 3</p> // also doesn't display
</React.Fragment>
The difference is that after writing the h1 tag I rebuilt Webpack.
Further testing confirmed that rebuilding bundle.js and refreshing the browser on the index.html page it injects into, is the only way to see updates.
I think I have hot reload setup as shown in the docs. And per another SO post I added --inline to the start command. But a manual build and dev server restart is still required.
What else is needed here?
// package.json
"scripts": {
"test": "jest --watch",
"watch": "webpack --watch",
"start": "webpack-dev-server --open --inline",
"build": "webpack"
},
"devDependencies": {
"#babel/core": "^7.4.5",
"#babel/preset-env": "^7.4.5",
"#babel/preset-react": "^7.0.0",
"babel-jest": "^24.8.0",
"babel-loader": "^8.0.6",
"jest": "^24.8.0",
"webpack": "^4.35.0",
"webpack-cli": "^3.3.5",
"webpack-php-loader": "^0.5.0"
},
"dependencies": {
"dotenv": "^8.0.0",
"dotenv-webpack": "^1.7.0",
"history": "^4.9.0",
"lodash": "^4.17.11",
"react": "^16.8.6",
"react-dom": "^16.8.6",
"react-redux": "^7.1.0",
"react-router-dom": "^5.0.1",
"redux": "^4.0.1",
"save-dev": "^2.0.0",
"webpack-dev-server": "^3.7.2"
}
// webpack.config.js
const webpack = require("webpack");
const dotenvWebpack = require("dotenv-webpack");
const path = require("path");
module.exports = {
entry : {
'./adminSettingsArea' :
'./adminSettingsArea/src/index.jsx'
},
output : {
filename : '[name]/bundle.js',
path : path.resolve(__dirname),
},
devtool: 'inline-source-map',
devServer : {
contentBase : './adminSettingsArea',
hot : true
},
plugins : [
new webpack.HotModuleReplacementPlugin(),
new dotenvWebpack()
],
module : {
rules : [
{
test : /\.(js|jsx)$/,
exclude : [/node_modules/, /vendor/],
use : {
loader : "babel-loader",
options : {
presets : [
'#babel/preset-env',
"#babel/preset-react"
]
},
}
}
],
},
};

Solved by moving the index.html file into the same folder ( ./adminSettingsArea/src ) as the rest of the content webpack updates in memory.
Previously this index file was one level below as was the contentBase value. As a result, webpack was able to load the index.html file initially but not the jsx files in the /src subfolder.
Also, please see the example below for another quirk I ran into with the output path.
entry : {
'adminArea' :
'./adminSettingsArea/src/index.jsx'
},
output : {
filename : 'shared/[name].bundle.js', // for some reason I need to assign the subfolder here instead of arg 2 in the next line
path : path.resolve(__dirname, ''),
},
devtool: 'inline-source-map',
devServer : {
contentBase : './adminSettingsArea/src',
hot : true
},

Related

How do you upgrade webpack-dev-server from v3 to v4?

I have been struggling with an issue with hot reloading where making edits in certain files would reload the app without those changes.
My initial solution was to update webpack and related modules. The first module I updated was webpack-dev-server. I went from v3 to v4 which immediately broke the app. All images and json files were getting 404'd when running the dev server.
Here is the original package.json:
{
...
"scripts": {
"dev": "set NODE_ENV=development && webpack serve --config config/webpack.dev.js --open",
"build": "set NODE_ENV=production && webpack --config config/webpack.prod.js",
"beatmarkers": "babel-node fetchAndFormatData/fetchAndFormatBeatMarkers.js"
},
"devDependencies": {
"#babel/cli": "^7.14.3",
"#babel/core": "^7.14.3",
"#babel/node": "^7.14.2",
"#babel/preset-env": "^7.14.4",
"clean-webpack-plugin": "^4.0.0-alpha.0",
"css-loader": "^5.2.6",
"file-loader": "^6.2.0",
"html-webpack-plugin": "^5.3.1",
"lodash.clonedeep": "^4.5.0",
"node-fetch": "^2.6.1",
"node-sass": "^6.0.0",
"sass-loader": "^11.1.1",
"style-loader": "^2.0.0",
"webpack": "^5.38.1",
"webpack-cli": "^4.7.0",
"webpack-dev-server": "^3.11.2",
"webpack-merge": "^5.7.3"
},
"dependencies": {
"bezier-easing": "^2.1.0",
"howler": "^2.2.3",
"pixi.js": "^6.2.0"
}
}
Here are the original webpack config files:
const path = require('path');
const webpack = require('webpack');
const HtmlWebpackPlugin = require('html-webpack-plugin');
module.exports = {
entry: './src/app.js',
plugins: [
new HtmlWebpackPlugin({
template: path.resolve(__dirname, '../src/template.html')
})
],
module: {
rules: [
{
test: /\.(png|jpe?g|gif|svg|ico|pvr|mp3|fnt)$/,
type: 'asset/resource'
},
{
test: /\.scss$/,
use: ['style-loader', 'css-loader', 'sass-loader']
}
]
}
};
const { merge } = require('webpack-merge');
const common = require('./webpack.common');
module.exports = merge(common, {
mode: 'development',
devServer: {
historyApiFallback: true,
},
output: {
publicPath: '/'
},
devtool: "source-map"
});
This configuration produces a sources structure in chrome that looks like this:
localhost:8080
main.js
(index)
assets/images
animations
fonts
interface
When I updated webpack-dev-server to the latest version, 4.11.1, the assets/images folder no longer exists. I haven't be able to figure out how to get it back. Any help would be deeply appreciated.

React + Webpack Entry point not working as mentioned in webpack.config.js

Below is the repo, I used to load a React Application
https://github.com/kannanagasamy/react-app-without-cra
Is there a way to change the way, webpack uses ./index.js to some path like './src/index.js'?
I tried using Entry point and pointed it to './src/index.js', but it's not working and webpack is still considering index.js on root folder instead of ./src/index.js
Can somebody help me, where I am going wrong in letting webpack consider index.js inside src folder as base file.
My Current Package.Json
"scripts": {
"build": "Webpack ."
},
"devDependencies": {
"#babel/cli": "^7.18.10",
"#babel/core": "^7.19.1",
"#babel/eslint-parser": "^7.19.1",
"#babel/plugin-transform-runtime": "^7.19.1",
"#babel/preset-env": "^7.19.1",
"#babel/preset-react": "^7.18.6",
"#babel/runtime": "^7.19.0",
"babel-loader": "^8.2.5",
"eslint": "^8.23.1",
"eslint-config-airbnb-base": "^15.0.0",
"eslint-config-prettier": "^8.5.0",
"eslint-plugin-jest": "^27.0.4",
"path": "^0.12.7",
"webpack": "^5.74.0",
"webpack-cli": "^4.10.0",
"webpack-dev-server": "^4.11.1"
},
"dependencies": {
"path": "^0.12.7",
"react": "^18.2.0",
"react-dom": "^18.2.0",
"#babel/cli": "^7.17.0"
}
My Current Webpack.config.file
module.exports={
mode: "development",
entry: "./index.js",
output: {
path: path.resolve(__dirname, "public"),
filename: "main.js"
},
target: "web",
resolve: {
extensions: ['.js','.jsx','.json']
},
module:{
rules: [
{
test: /\.(js|jsx)$/, //kind of file extension this rule should look for and apply in test
exclude: /node_modules/, //folder to be excluded
use: 'babel-loader' //loader which we are going to use
}
]
}
}
After updating entry point as mentioned below also, I couldn't able to move webpack to drive based on src/index.js
Codes Used
entry: path.resolve(__dirname, "src/index"),
entry: "src/index",
entry: path.resolve(__dirname, "src/index.js"),
entry: "src/index.js"
Thanks in Advance..
It seems like the issue around the command build you use which is webpack ., the option . is likely to mention the entry point at current dir ./index.js and then override the one in the configuration file so what you need to move index.js back to src/index.js and resolve the import accordingly again. Finally update the entry as you did ./src/index.js and remove . on as webpack cli.
{
build: 'webpack' // don't need to take any more extra arg
}

Problem with webpack not converting es6 properly

When I run npm run build in my directory, to get all my files bundled into bundle.js, I find this error: ERROR in ./bundle.js from UglifyJs \n Unexpected token name «key», expected punc «;» [./bundle.js:8141,13].
So I went to bundle.js line 8141 and found this: for (let key in val) {
And therein lies the problem: let. Uglify cannot deal with let and const
So I've looked through the entire bundle.js file and the ONLY time let appears is literally right there, and a couple lines down, and I know specifically what package that code comes from: npm install clone-deep
None of the other packages I'm using are having this issue, they are all correctly converted from es6 before uglify runs, and I use let and const in my own code all the time. This one package only is causing me the issue.
Here's my package.json
{
"name": "jsx2",
"version": "1.0.0",
"description": "",
"main": "index.js",
"author": "",
"license": "ISC",
"dependencies": {
"autobind-decorator": "^2.1.0",
"axios": "^0.18.0",
"babel-core": "^6.26.0",
"babel-loader": "^7.1.4",
"babel-plugin-transform-decorators-legacy": "^1.3.4",
"babel-polyfill": "^6.26.0",
"babel-preset-env": "^1.6.1",
"babel-preset-es2015": "^6.24.1",
"babel-preset-react": "^6.24.1",
"classnames": "^2.2.5",
"clone-deep": "^4.0.1",
"prop-types": "^15.6.0",
"react": "^16.2.0",
"react-dom": "^16.2.0",
"react-toastify": "^4.5.2",
"webpack": "^3.11.0"
},
"scripts": {
"dev": "webpack -d --watch",
"build": "webpack -p --config webpack.build.config.js"
}
}
And here's my webpack.build.config.js
// https://www.codementor.io/tamizhvendan/beginner-guide-setup-reactjs-environment-npm-babel-6-webpack-du107r9zr
var webpack = require('webpack');
var path = require('path');
var BUILD_DIR = path.resolve(__dirname, 'out/');
var APP_DIR = path.resolve(__dirname, 'src/');
var config = {
entry: ['babel-polyfill', APP_DIR + '/App.jsx'],
output: {
path: BUILD_DIR,
filename: './bundle.js'
//https://cloud.githubusercontent.com/assets/593571/20785959/290f7fbc-b7b4-11e6-9ad2-7dafd7803552.png
//https://github.com/babel/babel-loader/issues/93
},
module : {
loaders : [
{
test : /\.jsx?/,
include : APP_DIR,
loader : 'babel-loader',
options: {
"presets" : ["env", "react"],
"plugins": ["transform-decorators-legacy"]
}
}
]
},
resolve: {
extensions: ['.js', '.jsx'],
}
};
module.exports = config;
-- edit
Just to confirm, I did actually go into clone-deep index.js and change the lets to vars, and it all worked and I got no errors. I don't really consider that as a solution, because... there's no reason why this one package should have this error and nothing else. But it is definitely this one package that is the source of the issue.
Some npm packages have no es5 version. We have to accept this or use other packages.
If you want to continue to use clone-deep, you have to add this package to include property of your babel-loader config:
...
{
test : /\.jsx?/,
include : [APP_DIR, path.resolve(__dirname, 'node_modules', 'clone-deep')],
loader : 'babel-loader',
options: {
"presets" : ["env", "react"],
"plugins": ["transform-decorators-legacy"]
}
};
...
You can read more in this issue

Plugin/Preset files are not allowed to export objects, only functions. Removing and keeping babel installs? Selection with webpack?

I'm trying to learn how to write a React App and set up from practically scratch.
I keep trying to run webpack --config webpack.dev.config.js.
I keep getting this error. And I've tried using different loaders and presets.
What is wrong with my setup? Is it my npm node modules are outdated?
I've tried updating all my presets, loaders and even babel itself.
Error:
ERROR in ./src/index.js
Module build failed (from ./node_modules/babel-loader/lib/index.js):
Error: Plugin/Preset files are not allowed to export objects, only functions. In /Users/kyle.calica-steinhil/Code/react-components/react-imgur-album/node_modules/babel-preset-es2015/lib/index.js
at createDescriptor (/Users/kyle.calica-steinhil/Code/react-components/react-imgur-album/node_modules/#babel/core/lib/config/config-descriptors.js:178:11)
at items.map (/Users/kyle.calica-steinhil/Code/react-components/react-imgur-album/node_modules/#babel/core/lib/config/config-descriptors.js:109:50)
at Array.map (<anonymous>)
webpack.dev.config.js:
var path = require('path');
module.exports = {
mode: 'development',
// context: path.resolve(__dirname, 'src'),
entry: path.resolve(__dirname,'src/index.js'),
output: {
filename: 'main.js',
libraryTarget: "commonjs2"
},
module: {
rules: [
{
test: /\.js$/,
exclude: /node_modules/,
use: [
{
loader: 'babel-loader',
options: {
presets: ['es2015','react'],
plugins: ['transform-class-properties']
}
}
]
}
]
},
resolve: {
extensions: ['.js']
}
};
package.json :
{
"name": "react-imgur-album",
"version": "0.0.1",
"description": "React Component for displaying images in an Imgur Album",
"main": "index.js",
"scripts": {
"test": "echo \"Error: no test specified\" && exit 1",
"build": "webpack --config webpack.dev.config.js --progress --display-error-details"
},
"keywords": [
"imgur",
"react",
"react-components",
"component",
"images",
"photos",
"pics"
],
"author": "Kyle Calica",
"license": "ISC",
"dependencies": {
"#babel/preset-react": "^7.0.0",
"react-dom": "^16.5.2"
},
"devDependencies": {
"#babel/cli": "^7.1.2",
"#babel/core": "^7.1.2",
"#babel/plugin-proposal-class-properties": "^7.1.0",
"babel-cli": "^6.26.0",
"babel-core": "^6.26.3",
"babel-loader": "^8.0.4",
"babel-plugin-transform-class-properties": "^6.24.1",
"babel-preset-es2015": "^6.24.1",
"babel-preset-react": "^6.24.1",
"eslint": "^5.7.0",
"eslint-config-airbnb": "^17.1.0",
"eslint-plugin-import": "^2.14.0",
"eslint-plugin-jsx-a11y": "^6.1.2",
"eslint-plugin-react": "^7.11.1",
"fixed": "^0.3.0",
"it": "^1.1.1",
"path": "^0.12.7",
"react": "^16.5.2",
"webpack": "^4.22.0",
"webpack-cli": "^3.1.2",
"webpack-dev-server": "^3.1.9"
}
}
index.js:
import React, { Component } from 'react';
var imgurAPI = 'https://api.imgur.com/3/album/';
export default class ImgurAlbum extends Component {
constructor(props){
super(props);
this.state = {
imgurPosts: [],
isLoading: true
};
}
componentDidMount(){
fetch(imgurAPI + this.props.album + '/images',{
'headers':{
'Authorizathion': 'client-id'
}
}).then(res => res.json())
.then(data => console.log(data));
}
render(){
return(
<div>
<h1>hi!</h1>
</div>
);
}
}
I notice I have two babel cores installed, I don't know how to remove one, or which one to keep. Or even how to select which one with webpack?
I found my solution!
It's a babel mismatch.
I had an old babel-core and babel-presets installed.
In Babel 7, it is best to install using:
npm i #babel/preset-react #babel/preset-env
then in your .babelrc:
{
"presets" : ["#babel/preset-env","#babel/preset-react"]
}
I also uninstalled the old babel-preset-react and babel-preset-es2015 for safe measure.
Still learning so I might be missing steps or understanding here. Please add if you believe you need more information or if I am wrong about anything, but I was able to get mine to build

How to build the static file for use in deployment

With my current configuration of node and webpack, I am able to run the dev-server and develop my application.
I am however unable to create the static bundle.js that i could use for a deployment on my website.
How can I configure my webpack.js files and package.json command to make it build the required bundle file ?
When I run npm build, nothing happens
When I run npm deploy, i get the following error message :
Usage: npm <command>
where <command> is one of:
access, add-user, adduser, apihelp, author, bin, bugs, c,
cache, completion, config, ddp, dedupe, deprecate, dist-tag,
dist-tags, docs, edit, explore, faq, find, find-dupes, get,
help, help-search, home, i, info, init, install, issues, la,
link, list, ll, ln, login, logout, ls, outdated, owner,
pack, ping, prefix, prune, publish, r, rb, rebuild, remove,
repo, restart, rm, root, run-script, s, se, search, set,
show, shrinkwrap, star, stars, start, stop, t, tag, team,
test, tst, un, uninstall, unlink, unpublish, unstar, up,
update, upgrade, v, verison, version, view, whoami
npm <cmd> -h quick help on <cmd>
npm -l display full usage info
npm faq commonly asked questions
npm help <term> search for help on <term>
npm help npm involved overview
Specify configs in the ini-formatted file:
C:\Users\Sébastien\.npmrc
or on the command line via: npm <command> --key value
Config info can be viewed via: npm help config
Following is my configuration :
package.json
{
"license": "UNLICENSED",
"private": true,
"version": "1.0.0",
"webPath": "web/",
"nodePath": "node_modules/",
"devDependencies": {
"autoprefixer": "^6.3.1",
"exports-loader": "^0.6.2",
"grunt": "^0.4.5",
"grunt-autoprefixer": "^3.0.3",
"grunt-contrib-concat": "^0.5.1",
"grunt-contrib-cssmin": "^0.14.0",
"grunt-contrib-less": "^1.1.0",
"grunt-contrib-uglify": "^0.11.0",
"grunt-contrib-watch": "^0.6.1",
"grunt-css-url-rewrite": "^0.3.5",
"grunt-cssjoin": "^0.3.0",
"grunt-postcss": "^0.7.1",
"imports-loader": "^0.6.5",
"matchdep": "^1.0.0",
"redux-devtools": "^3.0.2",
"redux-devtools-dock-monitor": "^1.0.1",
"redux-devtools-log-monitor": "^1.0.4",
"webpack-shell-plugin": "^0.4.2"
},
"repository": {
"type": "git",
"url": ""
},
"dependencies": {
"babel-core": "^6.4.0",
"babel-loader": "^6.2.1",
"babel-plugin-transform-runtime": "^6.4.3",
"babel-polyfill": "^6.3.14",
"babel-preset-es2015": "^6.3.13",
"babel-preset-react": "^6.3.13",
"babel-preset-stage-0": "^6.3.13",
"babel-runtime": "^6.3.19",
"grunt-postcss": "^0.7.1",
"history": "^1.17.0",
"i18next": "^2.5.1",
"isomorphic-fetch": "^2.2.1",
"lodash": "^4.11.1",
"radium": "^0.16.2",
"rc-switch": "^1.4.2",
"react": "^0.14.6",
"react-dom": "^0.14.6",
"react-hot-loader": "^1.3.0",
"react-redux": "^4.1.2",
"react-router": "^1.0.3",
"react-router-redux": "^3.0.0",
"redux": "^3.1.6",
"redux-thunk": "^2.1.0",
"selfupdate": "^1.1.0",
"webpack": "^1.12.11",
"webpack-dev-server": "^1.14.1",
"whatwg-fetch": "^0.11.0"
},
"scripts": {
"start": "node webpack.dev-server.js",
"build": "webpack",
"deploy": "NODE_ENV=production webpack -p --config webpack.production.config.js"
}
}
webpack.config.js
var path = require('path');
var webpack = require('webpack');
var node_modules_dir = path.join(__dirname, 'node_modules');
var devFlagPlugin = new webpack.DefinePlugin({
__DEV__: JSON.stringify(JSON.parse(process.env.DEBUG || 'false'))
});
console.log(__dirname);
var config = {
entry: [
'babel-polyfill',
'webpack-dev-server/client?http://127.0.0.1:3000',
'webpack/hot/only-dev-server',
'./app/Resources/react/app.js'
],
output: {
path: path.join(__dirname, 'web/js'),
filename: 'bundle.js',
publicPath: 'http://127.0.0.1:3000/static/'
},
debug: true,
devtool: 'eval',
plugins: [
new webpack.HotModuleReplacementPlugin(),
new webpack.NoErrorsPlugin(),
devFlagPlugin
],
module: {
loaders: [
{
loaders: ["react-hot","babel-loader?plugins=transform-runtime&presets[]=es2015&presets[]=stage-0&presets[]=react"],
test: /\.js$/,
include: path.join(__dirname, 'app/Resources/react')
}
]
}
};
module.exports = config;
/*
new webpack.ProvidePlugin({
'fetch': 'imports?this=>global!exports?global.fetch!whatwg-fetch'
})
*/
webpack.dev-server.js
var webpack = require('webpack');
var WebpackDevServer = require('webpack-dev-server');
var config = require('./webpack.config');
new WebpackDevServer(webpack(config), {
publicPath: config.output.publicPath,
hot: true,
historyApiFallback: true,
quiet: false,
noInfo: false,
contentBase: "./assets"
}).listen(3000, 'localhost', function (err, result) {
if (err) {
console.log(err);
}
console.log('Listening at localhost:3000');
});
webpack.production.config.js
var path = require('path');
var node_modules_dir = path.resolve(__dirname, 'node_modules');
var config = {
entry: [
'babel-polyfill',
'./app/Resources/react/app.js'
],
output: {
path: path.join(__dirname, 'web/js'),
filename: 'bundle.js'
},
module: {
loaders: [
{
loaders: ["babel-loader?plugins=transform-runtime&presets[]=es2015&presets[]=stage-0&presets[]=react"],
test: /\.js$/,
include: path.join(__dirname, 'src/react')
}
]
}
};
module.exports = config;
you missed run
npm run deploy
run is required for all scripts. To help with common tasks npm knows how to use several preconfigured scripts such as start and test which is why npm start is an equivalent of npm run start.

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