What can Webpack do?
- Bundle multiple js files into 1 js file with correct js file order
- Bundle multiple css, images,… files into 1 js file
How to config Webpack?
How to setup output bundle file?
const path = require('path');
module.exports = {
entry: './src/index,js', // Entry point where webpack can start to bundle js files
output: {
filename: 'bundle.js', // Bundle js file name
path: path.resolve(_dirname, './dist') // Absolute path of folder where "bundle.js" is exported to
},
}
How to setup dev server?
Use “webpack-dev-server”
module.exports = {
mode: 'development',
devServer: {
port: 8081 // This makes "webpack serve" run on http://localhost:8081
},
...
}
How to insert bundle js into template HTML file?
Use html-webpack-plugin
- Create a template HTML file
<!DOCTYPE html> <html> <head></head> <body></body> </html>
- Setup Webpack
const HtmlWebpackPlugin = require('html-webpack-plugin');
module.exports = {
...
plugins: [
new HtmlWebpackPlugin({
template: './public/index.html',
})
]
}
- Here is the result
<!DOCTYPE html> <html> <head></head> <body><script src="bundle.js"></script></body> </html>
- Show js content into HTML body tag
Edit HTML template
<!DOCTYPE html> <html> <head></head> <body> <div id="root"></div> </body> </html>
Edit entry js file
const rootElement = document.getElementById('root');
rootElement.innerHTML = '<div>Testing</div>';
How to use React & Babel?
- Install packages
yarn add react react-dom yarn add babel-loader @babel/core @babel/plugin-proposal-class-properties @babel/plugin-transform-runtime @babel/preset-env @babel/preset-react --dev
- Create “babel.config.js”
{
"presets": [
[
"@babel/preset-env",
{
"modules": "auto",
"targets": {
"browsers": [
"last 2 Chrome versions",
"last 2 Firefox versions",
"last 2 Safari versions",
"last 2 iOS versions",
"last 1 Android version",
"last 1 ChromeAndroid version",
"ie 11"
]
}
}
],
[
"@babel/preset-react",
{
"runtime": "automatic"
}
]
],
"plugins": [
"@babel/plugin-proposal-class-properties",
"@babel/plugin-transform-runtime"
]
}
- Configure webpack
module: {
rules: [
// JavaScript: Use Babel to transpile JavaScript files
{
test: /\.(js|jsx)$/,
exclude: /node_modules/,
use: ['babel-loader']
}
]
}
- Edit entry file using React & jsx
import ReactDOM from 'react-dom'
import App from './App'
ReactDOM.render(<App />, document.getElementById('root'))
How to use “dotenv-webpack”?
Install
yarn add dotenv-webpack --dev
Usage
- Create .env.development file
// .env.development DB_HOST=127.0.0.1 DB_PASS=foobar S3_API=mysecretkey
- Add it to webpack
// webpack.config.js
const Dotenv = require('dotenv-webpack');
module.exports = {
...
plugins: [
new Dotenv({
path: './.env.development',
}),
]
...
};
- Use it in code
// file1.js console.log(process.env.DB_HOST); // '127.0.0.1'
How to setup proxy for localhost request?
How to make a request to /api/users proxy to http://localhost:3000/api/users?
module.exports = {
//...
devServer: {
proxy: {
'/api': 'http://localhost:3000',
},
},
};
How to omit “/api” in proxy request?
module.exports = {
//...
devServer: {
proxy: {
'/api': {
target: 'http://localhost:3000',
pathRewrite: { '^/api': '' },
},
},
},
};
How to proxy multiple paths to the same target?
module.exports = {
//...
devServer: {
proxy: [
{
context: ['/auth', '/api'],
target: 'http://localhost:3000',
},
],
},
};
How to override origin of host header?
The origin of the host header is kept when proxying by default, you can set changeOrigin to true to override this behaviour.
module.exports = {
//...
devServer: {
proxy: {
'/api': {
target: 'http://localhost:3000',
changeOrigin: true,
},
},
},
};
How to embed static Javascript into HTML template file?
Usually, you embed your static Javascript into HTML template file as below
// public/index.html
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8" />
<script>
window.myData = {
MY_DATA: []
}
</script>
</head>
<body>
</body>
</html>
you can make it a js file and embed it into HTML template file via webpack like this
// config/dev.config.js
window.myData = {
API_END_POINT: 'https://xxxx.com/',
MY_DATA: []
}
// webpack config file
const CopyPlugin = require('copy-webpack-plugin')
...
plugins: [
new CopyPlugin({
patterns: [{ from: 'config/dev.config.js', to: 'config.js' }],
}),
]
<!-- HTML template file -->
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8" />
</head>
<body>
<script src="config.js?v=#{version}"></script>
</body>
</html>
How to use relative path without ‘../’
- webpack config file
resolve: {
alias: {
Utilities: path.resolve(__dirname, 'src/utilities/'),
Templates: path.resolve(__dirname, 'src/templates/')
}
}
now you can use
// Instead of using relative paths import config from '../../../utilities/configs' // Now you can do import config from 'Utilities/configs'
- In order to make VSCode understand your new alias, edit “tsconfig.json”
{
...
"baseUrl": ".",
"paths": {
"Utilities/*": ["./src/utilities/*"],
"Templates/*": ["./src/templates/*"]
},
}
- Add package.json into “utilities” and “templates” folders
{
"name": "utilities"
}
{
"name": "templates"
}
How to bundle asset modules (Webpack 5)
webpack.config.js
...
module.exports = {
...
output: {
...
publicPath: 'dist/'
}
module: [
{
test: /\.(png|jpg)$/,
type: 'assets/resource'
}
]
}
how to set a public path for asset module
...
module.exports = {
...
module: [
{
test: /\.(png|jpg)$/,
type: 'assets/resource'
}
]
}
Leave a Reply