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.
Related
I am building a chrome extension in version 3 using firebase firestore. I have downloaded all the api in extension and I want to use importScript to fetch the api example: firebase-app.js and firebase-firestore.js. but it not working for me. The error in the console says "TypeError: Failed to execute 'importScripts' on 'WorkerGlobalScope': Module scripts don't support importScripts().".
Is 3 days now searching the net but no solution. Please any help?
Code of the issue
Here's a quick solution: in short, you will need to install webpack, which is a module bundler (it means that its main purpose is to bundle JavaScript files for usage in a browser). If you have npm already set up, you can execute this command in your project:
npm install webpack
After you have done that you can proceed to set up firebase (which, from what I can see from your image, you have already done). You will need to run another command:
npm install firebase
Continuing the setup of webpack, you will need to create a webpack.config.js file and there set the entry and the output. Again, you can find plenty of tutorials online, but here's a quick example implementation:
webpack.config.js:
const CopyWebpackPlugin = require('copy-webpack-plugin');
const webpack = require('webpack');
const path = require('path');
module.exports = {
mode: 'production',
entry: {
main: './src/main'
},
output: {
filename: '[name].bundle.js',
path: path.resolve(__dirname, 'dist')
},
module: {
rules: [
{
test: /\.js$/,
exclude: /node_modules/
},
{
test: /\.(png|svg|jpg|gif)$/,
use: [
'file-loader',
],
},
],
},
devServer: {
contentBase: './dist',
overlay: true,
hot: true
},
plugins: [
new CopyWebpackPlugin({
patterns: [
{ from: 'manifest.json', to: 'manifest.json' },
],
}),
new CopyWebpackPlugin({
patterns: [
{ from: 'images', to: 'images' },
],
}),
new CopyWebpackPlugin({
patterns: [
{ from: 'popup.html', to: 'popup.html' },
],
}),
new webpack.HotModuleReplacementPlugin()
],
};
Once you've done that, in your entry file (the entry point), you can import firebase and set it up:
main.js
import { initializeApp } from 'firebase/app';
// TODO: Replace the following with your app's Firebase project configuration
const firebaseConfig = {
//...
};
const app = initializeApp(firebaseConfig);
When you run npm start, webpack will create another folder (the 'dist' folder). This folder is the chrome exstension with firebase set up!
Hope I was able to help you. If you have any questions feel free to ask!
I have a static Javascript project (no react, vue, etc.) where I am trying to transpile, bundle, and minify my js with webpack. I would like to have bundle.js on my layout page which will include a bunch of global js that runs on all pages and then a page_x.js file that will be on individual pages as needed. The bundle.js file might consist of several other files and should be transpiled to es5 and minified.
With my current setup, the files are running twice. I'm not sure how to fix this. I want the file included globally but also want to be able to call the function as needed. If I delete the import statement from page.js I get the console error, "doSomething" is undefined. If I only include page.js on page.html and not on _layout.html common.js is only logged out on page.html. I want "common" to be logged once on every page and I want doSomething() to be available only on page.js.
Here is an example of it running twice:
common.js
console.log("common");
export function doSomething() {
console.log("do something");
}
page.js
import {doSomething} from "/common.js";
$(button).click(doSomething);
The expected output on page load (before clicking anything) would be:
"common"
Instead I'm seeing
"common"
"common"
My webpack.config.js file is as follows:
const path = require("path");
const MiniCssExtractPlugin = require("mini-css-extract-plugin");
const RemoveEmptyScriptsPlugin = require("webpack-remove-empty-scripts");
const { CleanWebpackPlugin } = require("clean-webpack-plugin");
const WebpackWatchedGlobEntries = require("webpack-watched-glob-entries-plugin");
const CssnanoPlugin = require("cssnano");
const TerserPlugin = require("terser-webpack-plugin");
const dirName = "wwwroot/dist";
module.exports = (env, argv) => {
return {
mode: argv.mode === "production" ? "production" : "development",
entry: WebpackWatchedGlobEntries.getEntries(
[
path.resolve(__dirname, "src/scripts/**/*.js"),
path.resolve(__dirname, "src/scss/maincss.scss")
]),
output: {
filename: "[name].js",
path: path.resolve(__dirname, dirName)
},
devtool: "source-map",
module: {
rules: [
{
test: /\.s[c|a]ss$/,
use:
[
MiniCssExtractPlugin.loader,
"css-loader?sourceMap",
{
loader: "postcss-loader?sourceMap",
options: {
postcssOptions: {
plugins: [
CssnanoPlugin
],
config: true
},
sourceMap: true
}
},
{ loader: "sass-loader", options: { sourceMap: true } },
]
},
{
test: /\.(svg|gif|png|eot|woff|ttf)$/,
use: [
"url-loader",
],
},
{
test: /\.m?js$/,
exclude: /(node_modules|bower_components)/,
use: {
loader: "babel-loader",
options: {
presets: ["#babel/preset-env"]
}
}
}
]
},
plugins: [
new WebpackWatchedGlobEntries(),
new CleanWebpackPlugin(),
new RemoveEmptyScriptsPlugin(),
new MiniCssExtractPlugin({
filename: "[name].css"
})
],
optimization: {
minimize: true,
minimizer: [
new TerserPlugin({
extractComments: false,
})
]
}
};
};
Any help would be greatly appreciated.
Webpack is about building a dependency graph of your application files and finally producing one single bundle.
With your configuration, you are actually trying to use Webpack as a Multi-entry object configuration as explained in Webpack documents. The culprit here is WebpackWatchedGlobEntries plugin. For each file matched by a glob pattern, it would create a bundle which is not what you want ever. For exmaple, if you have following structure:
- src/scripts
- common.js
- some
- page1.js
- other
- page2.js
This plugin will produce multi-page application. So, you configuration:
entry: WebpackWatchedGlobEntries.getEntries(
[
path.resolve(__dirname, "src/scripts/**/*.js"),
path.resolve(__dirname, "src/scss/maincss.scss")
]),
will internally return an object as:
entry: {
"common": "src/scripts/common.js",
"some/page1": "src/scripts/some/page1.js",
"other/page2": "src/scripts/other/page2.js"
}
It means if you import common.js into page1.js and page2.js, then you are in producing three bundles and all those bundles will possess the common module which would be executed three times.
The solution really depends on how to you want to configure your bundle:
If you need to bundle as a multi-page application, then you must use splitChunk optimization that allows you to create page specific bundle while keeping shared code separate (common.js for example). Keep in mind that you do not really need to manually create a separate bundle for common.js. with split chunks, Webpack should do that automatically for you.
If you need a single bundle, you can literally go ahead and create a single bundle for entire application (most typical workflow with Webpack) and use the same bundle on each page. You can have a common function like run that can figure the code to call using URL or some unique page specific identifier. In modern SPA, that is done using routing module.
What I will suggest is to keep things simple. Do not use WebpackWatchedGlobEntries plugin. That will complicate things if you are not familiar with Webpack. Keep entry simple like this:
entry: {
// Note that you don't need common module here. It would be picked up as part of your page1 and page2 dependency graph
"page1": "src/scripts/some/page1.js",
"page2": "src/scripts/other/page2.js"
}
Then, enable the splitchunk optimization as:
optimization: {
splitChunks: {
chunks: 'all'
}
}
Again, there are multiple options to choose from. You can read more details here about preventing code duplication.
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.
I need to disable AMD on 4 files and load video.js first before loading the other 3 files, because they depend on it. When I tried doing it in webpack.config.js like so:
const path = require('path')
const webpack = require('webpack')
module.exports = {
entry: './src/main.js',
output: {
path: __dirname + '/public',
filename: 'bundle.js'
},
devServer: {
inline: true,
contentBase: './src',
port: 3333
},
plugins: [
new webpack.DefinePlugin({
'process.env': {
'NODE_ENV': JSON.stringify('production')
}
})
],
module: {
loaders: [
{
test: /\.js$/,
exclude: /node_modules|lib/,
loader: 'babel',
query: {
presets: ['es2015', 'react', 'stage-2'],
plugins: ['transform-class-properties']
}
},
{
test: /\.json$/,
loader: 'json-loader'
},
{
test: /[\/\\]lib[\/\\](video|playlist|vpaid|overlay)\.js$/,
exclude: /node_modules|src/
loader: 'imports?define=>false'
}
]
}
}
It doesn't really work, because it just loads video.js (with disabled AMD) and completely ignores the other 3 files.
My folder structure is like so:
▾ lib/
overlay.js
playlist.js
video.js
vpaid.js
▸ node_modules/
▾ public/
200.html
bundle.js
▾ src/
App.js
index.html
main.js
LICENSE
package.json
README.md
webpack.config.js
Now, I found something that takes me 1 step back, because now even video.js doesn't load:
require('imports?define=>false!../lib/video.js')
require('imports?define=>false!../lib/playlist.js')
require('imports?define=>false!../lib/vpaid.js')
require('imports?define=>false!../lib/overlay.js')
and instead just throws these kinds of warnings:
WARNING in ./~/imports-loader?define=>false!./lib/video.js
Critical dependencies:
15:415-422 This seems to be a pre-built javascript file. Though this is possible, it's not recommended. Try to require the original source to get better results.
# ./~/imports-loader?define=>false!./lib/video.js 15:415-422
WARNING in ./~/imports-loader?define=>false!./lib/playlist.js
Critical dependencies:
10:417-424 This seems to be a pre-built javascript file. Though this is possible, it's not recommended. Try to require the original source to get better results.
# ./~/imports-loader?define=>false!./lib/playlist.js 10:417-424
WARNING in ./~/imports-loader?define=>false!./lib/vpaid.js
Critical dependencies:
4:113-120 This seems to be a pre-built javascript file. Though this is possible, it's not recommended. Try to require the original source to get better results.
# ./~/imports-loader?define=>false!./lib/vpaid.js 4:113-120
WARNING in ./~/imports-loader?define=>false!./lib/overlay.js
Critical dependencies:
10:416-423 This seems to be a pre-built javascript file. Though this is possible, it's not recommended. Try to require the original source to get better results.
# ./~/imports-loader?define=>false!./lib/overlay.js 10:416-423
So, my question is, how can I make this work in webpack.config.js so that I don't get these warnings?
I have solved the problem! To make this work you need this:
{
test: /[\/\\]lib[\/\\](video|playlist|vpaid|overlay)\.js$/,
exclude: /node_modules|src/
loader: 'imports?define=>false'
}
and this
require('script-loader!../lib/video.js')
require('script-loader!../lib/playlist.js')
require('script-loader!../lib/vpaid.js')
require('script-loader!../lib/overlay.js')
together!
Now, if you use this (instead of script-loader):
require('imports?define=>false!../lib/video.js')
require('imports?define=>false!../lib/playlist.js')
require('imports?define=>false!../lib/vpaid.js')
require('imports?define=>false!../lib/overlay.js')
It's not gonna work! (you need both imports-loader and script-loader working in unison.
I've been working on an app using React and Webpack for a little while. My development environment works fine, and everything loads properly using webpack-dev-server.
I decided to run a production build of the application to see what the end-product might look like size-wise and observe the general output of the webpack product build.
It turns out that running webpack -p, while it does produce output (more on that in a minute), does not load anything at all when I hit the site in a browser.. A quick check of the output tells me that none of my component code is making it into the webpack -p build.
The images and HTML copy over as they exist in my src (dev) folder, however my JS bundle output is extremely small - the file (main.js) is only 246 bytes.
Here is the output from running webpack -p
$ npm run build
> project#0.1.0 build /Users/me/Development/project
> NODE_ENV=production webpack -p --bail --progress --config webpack.config.babel.js
Hash: 9e5f6974ce21c920a375
Version: webpack 1.12.10
Time: 2003ms
Asset Size Chunks Chunk Names
index.html 1.45 kB [emitted]
images/edit.svg 524 bytes [emitted]
images/search.svg 1.19 kB [emitted]
main.js 246 bytes 0, 1 [emitted] javascript, html
+ 219 hidden modules
When I run the development version of the project, the output is markedly different... I know that the dev server dependencies are in there, and the code is not minified.. And, most importantly - everything works as expected when running the dev server.
$ npm start
> project#0.1.0 start /Users/me/Development/project
> webpack-dev-server --hot --display-modules --config webpack.config.babel.js
http://localhost:3333/
webpack result is served from /
content is served from /Users/me/Development/project/dist
Hash: 1b34ed58f9e323966ada
Version: webpack 1.12.10
Time: 2745ms
Asset Size Chunks Chunk Names
index.html 1.45 kB [emitted]
images/edit.svg 524 bytes [emitted]
images/search.svg 1.19 kB [emitted]
main.js 1.54 MB 0, 1 [emitted] html, javascript
Here's my webpack.config.babel.js file:
import webpack from 'webpack';
import path from 'path';
import ModernizrWebpackPlugin from 'modernizr-webpack-plugin';
import modernizrConfig from './modernizr.config';
const appDir = path.resolve(__dirname, './src');
const distDir = path.resolve(__dirname, './dist');
const nodeModulesDir = path.resolve(__dirname, './node_modules');
const excludeDirs = /(node_modules|bower_components)/;
module.exports = {
entry: {
javascript: appDir + '/main.js',
html: appDir + '/index.html'
},
output: {
path: distDir,
filename: 'main.js',
},
devServer: {
contentBase: distDir,
inline: true,
port: 3333
},
resolve: {
extensions: ['', '.js', '.es6'],
modulesDirectories: [
'node_modules',
'./src'
]
},
plugins: [
// new webpack.optimize.CommonsChunkPlugin('common.js'),
// new ModernizrWebpackPlugin(modernizrConfig),
],
sassLoader: {
sourceMap: false,
includePaths: [
appDir,
nodeModulesDir,
nodeModulesDir + '/breakpoint-sass/stylesheets/',
nodeModulesDir + '/susy/sass'
]
},
module: {
loaders: [
{ // js/jsx
test: /\.js?$/,
exclude: excludeDirs,
loader: 'babel',
query: {
cacheDirectory: true,
presets: [
'es2015', 'react'
]
}
},
{ // html
test: /\.html$/,
exclude: excludeDirs,
loader: 'file?name=[name].[ext]'
},
{ // images
test: /\.(gif|png|jpg|jpeg|svg)$/,
exclude: excludeDirs,
loader: 'file?name=images/[name].[ext]'
},
{ // sass
test: /\.scss$/,
exclude: excludeDirs,
loader: 'style!css!sass'
}
]
}
}
I don't think I've got a particularly complex, or uncommon setup, and I've tried changing everything from es2015/es6 to commonJS already as well, with the same result.
I'm at a loss as to what the issue could possibly be here; hoping that someone can point out some obvious error I've got, or perhaps suggest config updates/changes that could resolve this problem.
Thanks for taking the time to read everything!
As I mentioned in my comment, I've been using webpack successfully for months now, and I've never come across using an HTML file as an entry point.
Usually you'll use Webpack to package up javascript, css, and sometimes images (ie: "assets") to be used by an html file. Serving that HTML file is outside the realm of Webpack's responsibility.
I would suggest using Webpack to generate only the final javascript bundle, then using some other method (ie: express, or some other web server) to serve that file and the html that consumes it.