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Webpack Puppeteer Chromium Installation: Unable to launch browser

I'm setting up a node server to render React JSX components into images.
The server uses express, and the React components render to HTML using ReactDOMServer. I'm also using TypeScript. I bundle the whole thing using webpack. My webpack config is:
const path = require('path')
module.exports = {
entry: './src/index.tsx',
devtool: 'inline-source-map',
module: {
rules: [
{
test: /\.tsx?$/,
use: 'ts-loader',
exclude: /node-modules/,
},
],
},
resolve: {
extensions: ['.tsx', '.ts', '.js'],
},
output: {
filename: 'bundle.js',
path: path.resolve(__dirname, 'dist')
},
target: 'node'
};
The html will be rendered to an image using node-html-to-image (https://github.com/frinyvonnick/node-html-to-image)
The server starts without problems, but when a request hits the server and the html should be rendered I get an error in the console.
This is the code for the server that executes:
app.post('/', (req, res) => {
const element = <User name={req.body.name} login={req.body.login}/>
const html = ReactDOMServer.renderToStaticMarkup(element)
nodeHtmlToImage({
output: './image.png',
html: html
}).then(() => console.log("image created successfully!"))
})
and the error I get is: UnhandledPromiseRejectionWarning: Error: Unable to launch browser, error message: Could not find browser revision 737027. Run "npm install" or "yarn install" to download a browser binary.
I suspect that the problem has to do with the chromium installation coming with puppeteer not being bundled correctly by webpack but I'm not sure.
EDIT: setting an explicit executablePath works, but removes the portability of my bundle.js.

webpack-dev-server not recompiling (JS files AND SCSS files)

Good morning,
Rise and shine, the sun is already high in the sky and webpack is ruining my day!
I'm using webpack-dev-server (through a script in packages.json):
"scripts": {
"dev-server": "webpack-dev-server",
}
That I run with yarn run dev-server
What I want is the code to recompile and the browser to refresh whenever I save a file. I can live with the fact that it doesn't work with SCSS files, but recompiling "manually" on each change in my components is just physically painful. I tried a lot of solution found online (non-exhaustive list coming) before asking here, but the result is always the same:
ℹ ｢wdm｣: Compiled successfully
And nothing happens when I modify a file (JS or SCSS).
This is a simple React app, with SCSS for styling.
Here is my webpack config:
const path = require('path');
const MiniCSSExtractPlugin = require('mini-css-extract-plugin');
const mode = process.env.NODE_ENV || 'development';
module.exports = env => {
return {
entry: ['babel-polyfill', './src/app.js'],
output: {
path: path.join(__dirname, 'public', 'dist'),
filename: 'bundle.js'
},
module: {
rules: [{
loader: 'babel-loader',
test: /\.js$/,
exclude: /node_modules/
}, {
test: /\.s?css$/,
loader: [
mode === 'development' ? 'style-loader' : MiniCSSExtractPlugin.loader,
{
loader: 'css-loader',
options: {
sourceMap: true
}
},
{
loader: 'sass-loader',
options: {
sourceMap: true
}
}
]
}
]
},
plugins: [
new MiniCSSExtractPlugin({ filename: 'styles.css' })
],
devtool: env === 'production' ? 'source-map' : 'cheap-module-eval-source-map',
devServer: {
contentBase: path.join(__dirname, 'public'),
publicPath: '/dist/'
}
};
};
Here a list of things I tried:
Add --output-public-path=/dist/ to the script
Use the following content to the devServer config in webpack.config.js:
host: '0.0.0.0',
contentBase: path.join(__dirname, 'public'),
publicPath: '/dist/',
historyApiFallback: true,
compress: true,
port: 8080,
watchContentBase: true,
inline: true,
hot: true
Use HtmlWebpackConfig with the following config:
new HtmlWebpackPlugin({
title: 'Prognostic',
filename: './public/dist/index.html',
template: './public/index.html'
})
Remove / add webpack and webpack-dev-server
Use a global webpack-dev-server instead of the project one (npm i -g webpack-dev-server)
Certainly more things but I don't remember... Whoops
For information, here are the version I use:
Babel-loader#7
react#^16.8.6,
webpack-dev-server#^3.9.0
webpack#^4.41.2
So, I'd like two things to happen:
Automatic recompile when JS file changed
Automatic recompile when SCSS file changed (if possible)
If you can help me do that, I'll nominate you my Santa Dev of the year (yes, you can add that to your CV)
Thank you!
PS: great laugh when Grammarly told me that my text sounds "friendly"

Webpack dev server adds a watcher on your files to trigger the compilation when they have been modified.
Sometimes though, depending on the text editor you are using, this won't trigger at all.
I had the same problem, using sublimetext : when I saved my code the webpack dev server wouldn't rebuild.
So instead of using the default triggering mechanism, I'm using another option of webpack :
devServer: {
hot: true,
watchOptions: {
aggregateTimeout: 300,
poll: true
},
}
Every 300ms the server will check if files have changed and if so, rebuild.
I hope I am your Santa Dev of the year :]

I don't think you can do this by webpack you need to use library like react-hot-loader

Webpack warnings on page reload

I'm getting warnings in my console when I save changes or reload my React application and its also very slow when reloading
Instead of using create-react-app, I followed along on Traversy Media's video https://www.youtube.com/watch?v=deyxI-6C2u4 of setting up webpack from scratch.
It was actually working fine for the first few days but suddenly started acting very slow whenever my application reloaded after saving. These are the console warnings that display for second but then disappear once the application reloads:
[HMR] Cannot apply update. Need to do a full reload!
[HMR] Error: Aborted because ./src/Components/Layout/Home.js is not accepted
Update propagation: ./src/Components/Layout/Home.js -> ./src/Components/App.js -> ./src/index.js -> 0 at hotApply(http://localhost:8080/index_bundle.js:476:30) at http://localhost:8080/index.bundle.js:314:22
and this is what displays in my console when the application is running
[HMR] Waiting for update signal from WDS...
[WDS] Hot Module Replacement enabled.
webpack.config.js
const path = require('path');
const HtmlWebpackPlugin = require('html-webpack-plugin');
module.exports = {
entry: './src/index.js',
output: {
path: path.join(__dirname, '/dist'),
filename: 'index_bundle.js'
},
module: {
rules: [
{
test: /\.js$/,
exclude: /node_modules/,
use: {
loader: 'babel-loader'
}
},
{
test: /\.(md|jpg|gif)$/i,
use: [
{
loader: 'url-loader',
options: {
limit: 8192
}
}
]
}
]
},
plugins: [
new HtmlWebpackPlugin({
template: './src/index.html'
})
],
}
I'm assuming I have to add something in my webpack file. Can somebody explain to me what I have to put in there to make my application run smoothly again? Thanks

You have this warning
Update propagation: ./src/Components/Layout/Home.js ->
./src/Components/App.js -> ./src/index.js
Because you changing the the code in Home.js but Home.js is the child off App.js and App.js is child of index.js so it's kinda like nested tree. So webpack don't know how to reload your page because it's deeply nested inside 2 or 3 level of file. That is just a warning of webpack that it cant do hot reload so basically everything is working fine.

Webpack console.log output?

Can anyone direct me in the right direction?
So i've setup the webpack-dev-server with the truffle suite demo, just to get a basis on the foundation of my app. So my config file includes index.html & app.js, yet it try to display a console.log output to from app.js nothing shows via the console?
webpack.config.js
const path = require('path');
const CopyWebpackPlugin = require('copy-webpack-plugin');
module.exports =
{
entry: './app/javascripts/app.js',
output: {
path: path.resolve(__dirname, 'build'),
filename: 'app.js',
},
plugins: [
// Copy our app's index.html to the build folder.
new CopyWebpackPlugin([
{ from: './app/index.html', to: "index.html" }
])
],
module: {
rules: [
{
test: /\.css$/,
use: [ 'style-loader', 'css-loader' ]
}
],
loaders: [
{ test: /\.json$/, use: 'json-loader' },
{
test: /\.js$/,
exclude: /(node_modules|bower_components)/,
loader: 'babel-loader',
query: {
presets: ['es2015'],
plugins: ['transform-runtime']
}
}
]
},
devServer: {
compress: true,
disableHostCheck: true, // That solved .
quiet: false,
noInfo: false,
stats: {
// Config for minimal console.log mess.
colors: true,
version: false,
hash: false,
timings: false,
chunks: false,
chunkModules: false
}
}
}
app.js
// Import libraries we need.
import { default as Web3} from 'web3';
import { default as contract } from 'truffle-contract'
// Import our contract artifacts and turn them into usable abstractions.
import metacoin_artifacts from '../../build/contracts/MetaCoin.json'
import dextre_artifacts from '../../build/contracts/Dextre.json'
console.log("starting!");
Output when running webpack
Project is running at http://localhost:8080/
webpack output is served from /
Asset Size Chunks Chunk Names
app.js 1.93 MB 0 [emitted] [big] main
index.html 19.8 kB [emitted]
webpack: Compiled successfully.
Where can view the "starting!" output, this is a real annoyance as i need to tackle errors. I've tried viewing at http://localhost:8080// and http://localhost:8080/webpack-dev-server//, but no luck.

I had this same problem. As far as I can tell, the problem is that Webpack does not actually run the generated code on the server. The process that runs on the server simply checks for file changes and re-compiles when necessary. The code is actually all running on the client. So, the only way to view output from console.log() is to view the client browser's console.
Part of the confusion here is that while normally, node runs javascript on the server, in this case, node is delegating to a separate program entirely. You can run this whole thing without node installed at all, just using a standalone installation of the webpack executable. Node's execution environment is never used, thus you can't log to it.

Since you are using webpack-dev-server the console.log is gonna be printed into the browser console. If you want to see console.log printed in your terminal you can add a console.log inside webpack.config file.
If you are not providing the webpack-dev-server a port your app should run on 80 so opening the browser there and opening the browser console and you should be able to see the "starting! log.

Webpack - [HMR] Hot Module Replacement is disabled

I've looked around, but can't get any of the answers I've seen on stackoverflow to work.
I cannot use the command line for webpack or the webpack dev-server; I am restricted to using the Node API.
Below is how I am using webpack.
webpack.config.js
module.exports = {
entry: [
'webpack-dev-server/client?http://localhost:3000',
// i've also tried webpack/hot/dev-server here
'webpack/hot/only-dev-server',
path.join(__dirname, 'src', 'js', 'app.jsx')
],
output: {
path: path.join(__dirname, 'dist', 'js'),
filename: 'script.js',
publicPath: '/dist/'
},
module: {
loaders: [{
test: /\.(js|jsx)$/,
loaders: ['react-hot', 'babel']
}]
},
plugins: []
};
contained in a gulp task "start"
gulp.task('start', function (callback) {
var config = Object.create(require('webpack.config.js'));
config.plugins.push(new webpack.HotModuleReplacementPlugin());
var devServer = new webpackDevServer(webpack(config), {
stats: { colors: true },
contentBase: path.resolve(__dirname, 'dist'),
progress: true,
inline: true,
hot: true
});
});
What I expect
When I run gulp start, I expect the webpack dev server to spin up, allowing me to hit localhost:3000/. This should load an index.html from my project's /dist/ folder. So far so good. I expect that when I make a change to a file (e.g., app.jsx), that the change would be present.
What is actually happening
I am getting the error "[HMR] Hot Module Replacement is disabled", with no further explanation.
Any help would be appreciated. I have been trying to get hot reloading working for a full day.

in your webpack.config.js on the plugins section try this,
plugins: [new webpack.HotModuleReplacementPlugin()]
I know you are pushing the plugin in your gulp task but you have to use --hot --inline on cli or on your npm script

Try to run webpack as
webpack-dev-server --hot --inline in packge.json,
somehow official docs is wrong now.