Configuring React webpack.config.js - javascript

I found this code online to create a webpack for react.. what exactly is happening here? I need something like this to be able to use react right? I'm quite confused.
const path = require('path');
const SRC_DIR = path.resolve(__dirname, 'client');
const BUILD_DIR = path.resolve(__dirname, 'client');
module.exports = {
entry: path.resolve(SRC_DIR, 'client-app.js'),
output: {
filename: 'bundle.js',
path: BUILD_DIR
},
module: {
rules: [
{
test: /\.(js|jsx)$/,
exclude: [/node_modules/],
use: [{
loader: 'babel-loader',
options: { presets: ['es2015', 'react'] }
}],
}
]
}
}
Why is it asking me to please add some context? I am trying to add more details so that this question can be posted

The code above does the following:
It resolves the client folder inside your projects folder and saves it to SRC_DIR and BUILD_DIR.
It tells webpack to look for a file named client-app.js in the resolved client folder from step 1.
It tells webpack to output the bundles Javascript into the client folder from step 1 with the file name bundle.js.
It tells webpack to look for any imported or required .js and .jsx files beginning at client-app.js inside your project folder (while excluding files from node_modules unless explicitly imported) and load them into the bundle using the babel-loader with the presets to compile the code from es2015 react to es5.

Related

I just put one entry point but a lot of files compile in webpack

I have only one entry point, but when compile files with webpack-dev-server, it compiles a lot of files.
My webpack.config:
const path = require('path');
module.exports = {
entry: path.resolve(__dirname+'../../../../modules/beshop_mainmenu/views/js/back.js'),
output: {
path: path.join(__dirname, '../../../../modules/beshop_mainmenu/views/js/'),
publicPath: "back/",
filename:'back.js'
},
mode:'development',
module:{
rules:[{
test: /\.css$/,
use:['style-loader','css-loader'],
},]
}
}
The result:
It compiles a lot of files because the entry file for webpack-dev-server/client includes all those files (url, strip-ansi, etc). Webpack builds everything from your entry point. So it is normal, nothing is unusual.

How to copy script files from src to dist using webpack

I am new to webpack and attempting to learn it. I have been trying to copy my vendor js files and custom jquery scripts from src to dist using webpack. I have tried but I couldn't find any way.
So this is how my folder structure is:
Project_root_folder
node_modules/
package.json
src/
app/
app.js
img/
img1.png
css/
main.scss
js/
custom_slick.js
main.js
plugins/
jquery.min.js
slick.min.js
index.pug
about.pug
contact.pug
dist/
webpack.config.js
My webpack.config file
var path = require("path"),
src = path.resolve(__dirname, "src"),
dist = path.resolve(__dirname, "dist"),
webpack = require("webpack"),
HtmlWebpackPlugin = require("html-webpack-plugin"),
HtmlWebpackPugPlugin = require('html-webpack-pug-plugin'),
ExtractTextPlugin = require("extract-text-webpack-plugin"),
extractPlugin = new ExtractTextPlugin({
filename: "css/main.css"
});
module.exports = {
entry: src + "/app/app.js",
output: {
path: dist,
filename: "bundle.js",
publicPath: "/"
},
module: {
rules: [
{ //Convert .pug to .html
test: /\.pug$/,
loaders: ['file-loader?name=[name].html', 'pug-html-loader?pretty&exports=false']
},
{
test: /\.scss$/, //convert .scss to .css
use: extractPlugin.extract({
use: ["css-loader", "sass-loader?minimize=true"]
})
},
{
test: /..\js\$\.js$/, // move all .js files in js folder
use: [
{
loader: "file-loader",
options: {
name: "[name].js",
outputPath: "js/"
}
}
]
},
{
test: /..\js\plugins\.js$/,
use: [
{
loader: "file-loader",
options: {
name: "js/plugins/[name].js",
outputPath: "js/plugins/"
}
}
]
}
]
},
plugins: [
extractPlugin
]
}
App.js file
import '../css/main.scss';
require.context('../js/', true, /\.js$/); //require all js files in js folder
require.context('../js/plugins/', true, /\.js$/); // all js files in plugins folder which is inside js folder
function requirAll (r) { r.keys().forEach(r); }
requireAll(require.context('../', true, /\.pug$/));
Also when I run this config file, I noticed that only the script files with a suffix "-js" get copied and not any other js files included in js/ folder for example filename "main.js" doesn't get copied but if it were named "main-js.js" then it gets copied into my dist folder, and I am unable to copyfiles from plugins/ folder. I am unable to understand this.
I have tried every possible solution I could come across over Stack Overflow, GitHub and similar websites but none were helpful. Also I found webpack to be extremely confusing. Before moving to webpack, I had been using Gulp which I found a lot more helpful. I came across webpack and want to learn it but I am finding it extremely difficult.
Try to use Copy Webpack Plugin in order to copy files between folders.
I'm not sure the reason why you want to copy js files, webpack works like a tree dependency solver, so it should get an entry point (of the tree) and create a bundle that has the entire tree of dependencies.

optimize image inside desired folder

I am using webpack for bundling. I am using reactjs and django. I want the static files used by Django and reactjs be separate. I could minified image but the minified images are saved to the folder where the output file is bundled. I want all the minified images to be saved inside frontend -> assets folder. How can i do it so?
The project structure looks like following
app - its a directory where static files are kept for Django. Webpack bundles the react files to app.js and is placed over here because Django template need it to render in its template as <script src='app/bundle/js/app.js'></script>.
frontend - It's a directory where all the react files reside. I want the images to be inside this directory(assets/images/). Images that will be used in reactjs.
How can i do it so?
my webpack right now is configured this way
const path = require("path");
if(!process.env.NODE_ENV) {
process.env.NODE_ENV = 'development';
}
module.exports = {
entry: [
'./src/index.js'
],
output: {
path: path.join("../app/static/build/", "js"),
filename: "app.js",
publicPath: "../app/static/build/"
},
devtoo: 'source-map',
debug: true,
module: {
loaders: [{
exclude: /node_modules/,
loader: 'babel',
query: {
presets: ['react', 'es2015', 'stage-1']
}
},
{test: /\.(jpe?g|png|gif|svg)$/i, loader: "file-loader?name=images/[name].[ext]"},
]
},
resolve: {
extensions: ['', '.js', '.jsx']
},
devServer: {
historyApiFallback: true,
contentBase: './'
}
};
You can specify custom output and public paths by using the outputPath and publicPath query name parameters:
loader: "file-loader?name=[name].[ext]&publicPath=assets/foo/&outputPath=app/images/"
But this feature isn't published to NPM yet. So unfortunatly you'll need to wait while it be published or clone and use this loader from github repo

Making a library importable using webpack and babel

I am trying to publish a package on npm (this one) that I am developing using webpack and babel. My code is written in ES6. I have a file in my sources, index.js, that (for the moment) exports one of my library's core components, it simply goes like this:
import TheGamesDb from './scrapers/thegamesdb';
export { TheGamesDb };
I am using webpack and babel to create a dist index.js that is my package's main file. My webpack.config.js goes like this:
const webpack = require('webpack');
const nodeExternals = require('webpack-node-externals');
module.exports = {
entry: {
index: ['babel-polyfill', './src/index.js'],
development: ['babel-polyfill', './src/development.js']
},
output: {
path: '.',
filename: '[name].js',
library: 'rom-scraper',
libraryTarget: 'umd',
umdNamedDefine: true
},
devtool: 'source-map',
module: {
loaders: [
{ test: /\.js$/, loader: 'babel-loader', exclude: /node_modules/ }
]
},
target: 'node',
externals: [nodeExternals()]
};
Now when I load my package in another project and try to import my export TheGamesDb simply like this
import { TheGamesDb } from 'rom-scraper';
I get the error
Uncaught TypeError: Path must be a string. Received undefined
It is to be noted that I am importing my library in electron.
Update: Electron seems to be the main problem here and it is not even my library but a dependency that throws this error (only in Electron)
The problem wasn't any of the things in my question but node-expat not working in electron. I switched to an alternative library and it's all right now.

Webpack throws syntax error for JSX

When I attempted to use webpack to compile my react jsx code, I received the following error:
ERROR in ./client/index.js
Module parse failed: C:\Users\Gum-Joe\Documents\Projects\bedel/client\index.js Unexpected token (6:11)
You may need an appropriate loader to handle this file type.
SyntaxError: Unexpected token (6:11)
at Parser.pp.raise (C:\Users\Gum-Joe\Documents\Projects\bedel\node_modules\acorn\dist\acorn.js:920:13)
at Parser.pp.unexpected (C:\Users\Gum-Joe\Documents\Projects\bedel\node_modules\acorn\dist\acorn.js:1483:8)
at Parser.pp.parseExprAtom (C:\Users\Gum-Joe\Documents\Projects\bedel\node_modules\acorn\dist\acorn.js:330:12)
at Parser.pp.parseExprSubscripts (C:\Users\Gum-Joe\Documents\Projects\bedel\node_modules\acorn\dist\acorn.js:225:19)
at Parser.pp.parseMaybeUnary (C:\Users\Gum-Joe\Documents\Projects\bedel\node_modules\acorn\dist\acorn.js:204:17)
at Parser.pp.parseExprOps (C:\Users\Gum-Joe\Documents\Projects\bedel\node_modules\acorn\dist\acorn.js:151:19)
at Parser.pp.parseMaybeConditional (C:\Users\Gum-Joe\Documents\Projects\bedel\node_modules\acorn\dist\acorn.js:133:19)
at Parser.pp.parseMaybeAssign (C:\Users\Gum-Joe\Documents\Projects\bedel\node_modules\acorn\dist\acorn.js:110:19)
at Parser.pp.parseExpression (C:\Users\Gum-Joe\Documents\Projects\bedel\node_modules\acorn\dist\acorn.js:86:19)
at Parser.pp.parseReturnStatement (C:\Users\Gum-Joe\Documents\Projects\bedel\node_modules\acorn\dist\acorn.js:1854:26)
at Parser.pp.parseStatement (C:\Users\Gum-Joe\Documents\Projects\bedel\node_modules\acorn\dist\acorn.js:1719:19)
at Parser.pp.parseBlock (C:\Users\Gum-Joe\Documents\Projects\bedel\node_modules\acorn\dist\acorn.js:1991:21)
at Parser.pp.parseFunctionBody (C:\Users\Gum-Joe\Documents\Projects\bedel\node_modules\acorn\dist\acorn.js:607:22)
at Parser.pp.parseMethod (C:\Users\Gum-Joe\Documents\Projects\bedel\node_modules\acorn\dist\acorn.js:576:8)
at Parser.pp.parseClassMethod (C:\Users\Gum-Joe\Documents\Projects\bedel\node_modules\acorn\dist\acorn.js:2137:23)
at Parser.pp.parseClass (C:\Users\Gum-Joe\Documents\Projects\bedel\node_modules\acorn\dist\acorn.js:2122:10)
# ./client/index.js 1:0-20
.babelrc:
{
"presets": ["es2015", "react"]
}
webpack.config.js:
// Webpack config
const path = require('path');
const webpack = require('webpack');
const HtmlWebpackPlugin = require('html-webpack-plugin');
module.exports = {
// Use client as our root
context: __dirname + "/client",
// Entry file
entry: "./index.js",
// Resolve
resolve: {
extensions: ['', '.js', '.jsx']
},
// Output to /build
output: {
path: path.join(__dirname, "build", "js"),
filename: "bundle.js"
},
loaders: [
{ test: /\.jsx$/, exclude: /node_modules/, loader: "babel-loader" }
],
// Plugins
plugins: [
// HTML
new HtmlWebpackPlugin({
title: 'Bedel',
filename: path.join(__dirname, 'views', 'index.ejs'),
template: path.join(__dirname, 'client', 'templates', 'index.ejs')
})
]
};
index.js:
import React from 'react';
import ReactDOM from 'react-dom';
class App extends React.Component {
render () {
return <p> Hello React</p>;
}
}
ReactDOM.render(<App/>, document.getElementById('app'));
I have installed all the babel presets required, as well as babel-core.
I have looked at the following answers already:
babel-loader jsx SyntaxError: Unexpected token
React, babel, webpack not parsing jsx code
Edit: After commenting out my jsx syntax, the outputting bundle.js does not appear to have been transformed by babel (i.e. I can see ES6 code in it)
Edit: Sorry for the inconvenience, but app.jsx was a solution that I tried that involved putting the logic that should be in index.js into a separate file.
Edit: Here is a list of the solutions I tried that did not work:
Copy .babelrc to client/.babelrc
Change test to test for .js instead of .js
Separate app logic into separate file (app.js)
Put presets to use in webpack config
Also, I have pushed my code to my GitHub repo (https://github.com/Gum-Joe/bedel). Feel free to have a look at it.
You configured the loader to only pass .jsx files through Babel:
test: /\.jsx$/
However, your file has the extension .js. Either rename the file or update the test expression to /\.jsx?$/.
In addition to updating the test, you need to rename .babel.rc to .babelrc (no . before rc). Otherwise Babel thinks that there is no configuration file and won't load any presets.
The loaders property must exist within the module property. Webpack Loaders
module.exports = {
// ...
// Output to /build
output: {
path: path.join(__dirname, "build", "js"),
filename: "bundle.js"
},
module: {
loaders: [
{ test: /\.jsx$/, exclude: /node_modules/, loader: "babel-loader" }
]
},
//...
};
You need to use react-preset with babel, like here:
loaders: [{
test: /\.(js|jsx)$/,
loader: 'babel',
query: {
presets: [
'es2015',
'react'
]
}
}]
I'm having this issue as well, and if you're using Windows and Node 6.x, the only workaround I've found for now seems to be to use Node 4 LTS or 5 instead. Without knowing the root cause, the problem seems to stem from some combination of using JSX, Webpack, Babel, Acorn JS, Node 6, and Windows.
https://github.com/coryhouse/pluralsight-redux-starter/issues/2
https://github.com/danmartinez101/babel-preset-react-hmre/issues/32
Can you try wrapping the entire element in brackets "()"?
return (<p>...</p>)

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