Webpack 2: can't resolve node.js native modules - node.js

After bundling I have following errors:
Module not found: Error: Can't resolve 'crypto' in //filePath
It can't resolve five modules: crypto, fs, path, vm and constants - from any file which requires them
I thought it could be because of nvm which I use, but I switched to system nodejs via nvm use system command and webpack still throws these errors.
I also thought it could be target property, so I changed it to node, but it didn't help too (anyway I need electron-renderer, not node).
Important note: I've just migrated from webpack 1. It all works well before I migrated. But these are the only errors I have. Moreover, webpack seems to work fine, it even watches files when I pass --watch option.
Here is my webpack.config.js:
const config = {
target: 'electron-renderer',
context: __dirname,
entry: { app: './app.js', vendor: [/*vendors*/]},
cache: true,
devtool: 'source-map',
watch: false
resolve: {
extensions: ['.js', '.json', '.jsx'],
modules: ["node_modules"]
},
module: {
rules: [
{test: /\.html/, loader: 'html-loader'},
{
test: /\.less$/,
use: ExtractTextPlugin.extract({
fallback: "style-loader",
use: ["css-loader?sourceMap", "less-loader?sourceMap"]
})
},
{
test: /\.css/,
use: ExtractTextPlugin.extract({
fallback: "style-loader",
use: "css-loader?sourceMap"
})
},
{test: /\.(jpg|png|gif|jpeg|svg|otf|ttf|eot|woff)$/, loader: 'url-loader?limit=10000'}
]
},
plugins: [
new ExtractTextPlugin('styles.[contenthash].css'),
new webpack.optimize.CommonsChunkPlugin({
names: ['commons', 'vendor', 'manifest'],
minChuncks: Infinity
}),
new HtmlWebpackPlugin({
template: './index.html',
filename: 'index.html',
hash: false,
inject: 'head',
cashe: true,
showErrors: true
})
],
output: {
publicPath: './',
path: path.join(__dirname, 'dist'),
filename: '[name].[chunkhash].js',
chunkFilename: '[name].[chunkhash].js'
}
};
module.exports = config;

The problem was in worker-loader, which is not in my webpack.config.js (I used it directly when importing file). See this issue for details (not fixed yet).

Related

Cannot find module "fs" - at webpackMissingModule

My server starts and runs correctly, but when I hit the URL in the browser it gives an error "cannot find module 'fs'".
I tried to setting:
target: 'node', but it starts another error
node: { fs: 'empty' }, but then it gives an error "cannot find exports"
"use strict";
const webpack = require('webpack');
const argv = require('minimist')(process.argv.slice(2));
const DEBUG = !argv.release;
const path = require('path');
var plugins = [
new webpack.optimize.CommonsChunkPlugin({
names: ['common', 'vendors'],
filename: '[name].js',
minChunks: Infinity
}),
new webpack.optimize.OccurenceOrderPlugin(),
new webpack.DefinePlugin({
'process.env.NODE_ENV': DEBUG ? '"development"' : '"production"',
"process.argv.verbose": !!DEBUG
}),
new webpack.ProvidePlugin({
$: "jquery",
jQuery: "jquery",
jquery: "jquery"
})
].concat(DEBUG ? [] : [
new webpack.optimize.DedupePlugin(),
new webpack.optimize.UglifyJsPlugin({
minimize: true,
compress: {
warnings: true
}
}),
new webpack.optimize.AggressiveMergingPlugin()
]);
module.exports = {
entry: {
app: path.join(__dirname, '..', 'app', 'app.js'),
vendors: [
'react',
'react-dom',
'react-bootstrap',
'react-router',
'alt',
'lodash',
'superagent',
'react-router-role-authorization',
'react-validation-decorator'
]
},
output: {
publicPath: '/js/',
path: './wwwroot/js/',
filename: '[name].js',
chunkFilename: "[id].[name].js"
},
context: path.join(__dirname, '..'),
plugins: plugins,
cache: DEBUG,
debug: DEBUG,
watch: DEBUG,
stats: {
colors: true
},
resolve: {
extensions: ['', '.webpack.js', '.web.js', '.js', '.jsx', '.json']
},
module: {
loaders: [
{
test: /\.js$/,
exclude: /node_modules/,
loaders: ['babel-loader']
},
{
test: /\.(less|css)$/,
loaders: ["style", "css", "less"]
},
{
test: /\.(png|jpg|jpeg|gif|svg|woff|woff2)$/,
loader: 'url-loader?limit=10000'
},
{
test: /\.(eot|ttf|wav|mp3|mp4)$/,
loader: 'file-loader'
},
{
test: /\.json$/,
loader: 'json-loader'
}
]
},
node: {
net: 'mock',
dns: 'mock'
}
};
It should not give this error and work correctly.
I don't see any mention of the fs module in your posted webpack setup. So, my guess is that your output application (app.js?) is trying to require and use fs. Webpack is building a client-side, front-end application, one that will be loaded in the browser; fs is not available in the browser.
(Double-check and make sure you aren't trying to, for example, read and write files on the user's machine using fs inside your client-side application. That is not possible in a browser-based application. For an intro to the concept of web applications with a front end and back end, check out the article React App With Node Backend.)

How can I see a list of packages actually used for my application bundle?

I have a problem in treeshaking. It seems like it is not too effective on my project. Is there a way to see a list of the dependencies that is actually used in my webpacked file?
Webpack config:
entry: sourceEntryFile,
mode: 'production', // for webpack 4
target: 'node',
output: {
filename: '[name].js',
path: outputPathFolder,
libraryTarget: 'commonjs',
},
resolve: {
extensions: ['.js', '.json'],
modules: ['node_modules']
},
node: {
__dirname: false,
},
externals: {
'aws-sdk': 'aws-sdk'
},
plugins: (() => {
const plugins = [
new webpack.DefinePlugin({
'global.GENTLY': false
})
];
// plugins.push(new WebpackBundleAnalyzer.BundleAnalyzerPlugin());
return plugins;
})()
npm ls seems to be the closest one. The results show which modules are being used in current project.

Do I need to add my server.js into my webpack file?

I have a node server with es6 syntax, like import statements, which it cannot recognize. I am pretty sure I would have to add that to my webpack file, but unsure on how to do that and whether it is required. My node server file is called server.js
var webpack = require('webpack');
module.exports = {
entry: {
app: './src/index.js',
vendor: './src/vendor.js'
},
output: {
path: __dirname,
publicPath: '/',
filename: '[name].js'
},
plugins: [
new webpack.optimize.CommonsChunkPlugin('vendor','vendor.js', Infinity)
],
module: {
loaders: [{
exclude: /node_modules/,
loader: 'babel',
query: {
presets: ['react', 'es2015', 'stage-1']
}
}]
},
resolve: {
extensions: ['', '.js', '.jsx']
},
devServer: {
historyApiFallback: true,
contentBase: './'
}
};
To use the import keyword in Node you have to transpile it so it either has to be processed by webpack if you use it or at least transpiled with a tool like Babel. See this for more info:
https://github.com/babel/babel-preset-env

Bundle sha3/binary modules with Webpack

Webpack warns when I bundle my source as it can't resolve the 'sha3' module.
$ npm run build
WARNING in ./~/keccakjs/index.js
Module not found: Error: Can't resolve 'sha3' in '<PROJ>\node_modules\keccakjs'
# ./~/keccakjs/index.js 2:19-34
# ./~/<lib>/index.js
# ./lib/<file>.js
Reason being the sha3 library has no js files.
Creating library <proj>\node_modules\sha3\build\Release\sha3.lib and object <proj>\node_modules\sha3\build\Release\sha3.exp
I am able to run require('sha3') in my project, however webpack cannot resolve it.
I looked at the docs here, regarding how webpack resolves libs.
Could someone point me to how I can include sha3 in/with my bundle.
My Webpack config:
module.exports = {
target: 'node',
entry: "./<lib>.js",
devtool: "source-map",
node: {
__dirname: false,
__filename: false,
},
output: {
path: "./dist",
filename: "<lib>.min.js"
},
plugins: [
new webpack.optimize.OccurrenceOrderPlugin(),
new webpack.DefinePlugin({
'process.env.NODE_ENV': JSON.stringify('production')
})
]
}
What actually ended up working for me was:
resolve: {
alias: {
sha3: path.join(__dirname,'node_modules/sha3/build/Release/sha3.node')
},
},
module: {
rules: [
{test: /\.node$/, use: 'node-loader'},
]
},
That way I told it which file to import, when it wasn't able to resolve sha3. And the node-loader packages in the .node file!
Try using the binary loader from webpack from here. Then you can:
1) Define loaders in your WebPack config:
module.exports = {
target: 'node',
entry: "./<lib>.js",
devtool: "source-map",
node: {
__dirname: false,
__filename: false,
},
output: {
path: "./dist",
filename: "<lib>.min.js"
},
plugins: [
new webpack.optimize.OccurrenceOrderPlugin(),
new webpack.DefinePlugin({
'process.env.NODE_ENV': JSON.stringify('production')
})
],
module: {
loaders: [
{ test: /sha3$/, loader: 'binary' }
]
}
}
2) Use the loader directly in your import:
require('binary!sha3');

Sass loader not working in webpack

I am trying to get *.scss files to be supported in my webpack configuration but I keep getting the following error when I run the webpack build command:
ERROR in ./~/css-loader!./~/sass-loader!./app/styles.scss
Module build failed: TypeError: Cannot read property 'sections' of null
at new SourceMapConsumer (/Users/sean/Development/playground/webpack.sass.test/node_modules/css-loader/node_modules/postcss/node_modules/source-map/lib/source-map/source-map-consumer.js:23:21)
at PreviousMap.consumer (/Users/sean/Development/playground/webpack.sass.test/node_modules/css-loader/node_modules/postcss/lib/previous-map.js:37:34)
at new Input (/Users/sean/Development/playground/webpack.sass.test/node_modules/css-loader/node_modules/postcss/lib/input.js:42:28)
at parse (/Users/sean/Development/playground/webpack.sass.test/node_modules/css-loader/node_modules/postcss/lib/parse.js:17:17)
at new LazyResult (/Users/sean/Development/playground/webpack.sass.test/node_modules/css-loader/node_modules/postcss/lib/lazy-result.js:54:47)
at Processor.process (/Users/sean/Development/playground/webpack.sass.test/node_modules/css-loader/node_modules/postcss/lib/processor.js:30:16)
at processCss (/Users/sean/Development/playground/webpack.sass.test/node_modules/css-loader/lib/processCss.js:168:24)
at Object.module.exports (/Users/sean/Development/playground/webpack.sass.test/node_modules/css-loader/lib/loader.js:21:15)
# ./app/styles.scss 4:14-117
I can't for the life of me figure out why. It's a very basic setup.
I have created a dropbox share with the bare minimum illustrating this:
https://www.dropbox.com/s/quobq29ngr38mhx/webpack.sass.test.zip?dl=0
Unzip this then run:
npm install
webpack
Here is my webpack.config.js file:
var path = require('path')
var webpack = require('webpack')
module.exports = {
devtool: 'eval',
entry: [
'./app'
],
output: {
path: path.join(__dirname, 'dist'),
filename: 'index.js',
publicPath: '/dist/'
},
plugins: [
new webpack.NoErrorsPlugin()
],
resolve: {
extensions: ['', '.js']
},
module: {
loaders: [{
test: /\.scss$/,
loader: 'style-loader!css-loader!sass-loader'
}]
}
}
And the index.js entry file:
require('./styles.scss');
alert('foo bar baz');
And the styles.scss file:
body {
background-color: #000;
}
It appears to follow the recommendations of the sass-loader documentation site, but I can't get it to run.
:(
Information about my environment:
node - 0.12.4
npm - 2.10.1
os - OS X Yosemite
I have managed to get another workaround working that doesn't involve editing the css-loader libraries within my npm_modules directory (as per the answer by #chriserik).
If you add '?sourceMap' to the sass loader the css loader seems to handle the output.
Here is my updated configuration:
var path = require('path')
var webpack = require('webpack')
module.exports = {
devtool: 'eval',
entry: [
'./app'
],
output: {
path: path.join(__dirname, 'dist'),
filename: 'index.js',
publicPath: '/dist/'
},
plugins: [
new webpack.NoErrorsPlugin()
],
resolve: {
extensions: ['', '.js']
},
module: {
loaders: [{
test: /\.scss$/,
loader: 'style!css!sass?sourceMap'
}]
}
}
P.S. I even expanded this test to include a compass-mixins include, and this worked too.
After having the same issue, I found this: https://github.com/webpack/css-loader/issues/84
Apparently, the solution for now is to manually modify lines 17-19 of /node_modules/css-loader/lib/loader.js with
if(map && typeof map !== "string") {
map = JSON.stringify(map);
}
This fixed the problem for me.
The problem is solved by setting source-map option to true (as seen in other answers).
But in case you find messy passing options in the query string there is an alternative;
for configuring the sass loader you can create a sassLoader property in the webpack config object:
module.exports = {
devtool: 'eval',
entry: [
'./app'
],
output: {
path: path.join(__dirname, 'dist'),
filename: 'index.js',
publicPath: '/dist/'
},
plugins: [
new webpack.NoErrorsPlugin()
],
resolve: {
extensions: ['', '.js']
},
module: {
loaders: [{
test: /\.scss$/,
loader: 'style!css!sass'
// loader: ExtractPlugin.extract('style', 'css!sass'),
}]
},
sassLoader: {
sourceMap: true
},
}

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