We Keep Coding

Configuring Webpack to Execute TypeScript + Mocha Tests

I'd like to configure webpack to transpile (mocha + chai) tests written in typescript to javascript and them execute them. To that end, I have the webpack.test.config.js file below. Note: I've currently configured webpack to use ts-loader and mocha-loader.
Unfortunately, when I execute webpack --config webpack.test.config.js --env.dev, I receive the error:
Module parse failed: Unexpected token (2:10) You may need an
appropriate loader to handle this file type.
How can resolve this error and achieve my aforementioned goal?
const path = require('path');
const CleanWebpackPlugin = require('clean-webpack-plugin');
const outputPath = './bin/test';
module.exports = env => {
return {
mode: env && env.pro ? 'production' : 'development',
context: path.resolve('src'),
entry: {
core: './test/typescript/core.spec.ts'
},
output: {
filename: '[name].js',
path: path.join(__dirname, outputPath)
},
devtool: 'source-map',
plugins: [
new CleanWebpackPlugin({
dry: true,
cleanOnceBeforeBuildPatterns: ['./bin/test/**/*']
})
],
module: {
rules: [
{
test: /\.spec\.tsx?$/,
use: ['mocha-loader', 'ts-loader'],
exclude: /node_modules/
}
]
},
resolve: {
extensions: ['.tsx', '.ts', '.js']
}
};
};

Webpack - Excluding node_modules with also keep a separated browser and server management

(webpack.config.js file content below)
I'm trying to make a webpack exclusion on node modules.
I found that using webpack-node-externals works for it but using that on my common config causes this other error:
Require is not defined on reflect-metadata - __webpack_require__ issue
So... I was wondering how can i exclude webpack bundling also on the browser side without getting any issue.
My webpack version: 3.11.0
webpack-config.js
const path = require('path');
const webpack = require('webpack');
const merge = require('webpack-merge');
const AotPlugin = require('#ngtools/webpack').AotPlugin;
const CheckerPlugin = require('awesome-typescript-loader').CheckerPlugin;
var nodeExternals = require('webpack-node-externals');
module.exports = (env) => {
// Configuration in common to both client-side and server-side bundles
const isDevBuild = !(env && env.prod);
const sharedConfig = {
//externals: [nodeExternals()], // in order to ignore all modules in node_modules folder
stats: { modules: false },
context: __dirname,
resolve: { extensions: [ '.js', '.ts' ] },
output: {
filename: '[name].js',
publicPath: 'dist/' // Webpack dev middleware, if enabled, handles requests for this URL prefix
},
module: {
rules: [
{ test: /\.ts$/, use: isDevBuild ? ['awesome-typescript-loader?silent=true', 'angular2-template-loader', 'angular2-router-loader'] : '#ngtools/webpack' },
{ test: /\.html$/, use: 'html-loader?minimize=false' },
{ test: /\.css$/, use: [ 'to-string-loader', 'style-loader', isDevBuild ? 'css-loader' : 'css-loader?minimize' ] },
{ test: /\.(png|jpg|jpeg|gif|svg)$/, use: 'url-loader?limit=25000' }
]
},
plugins: [new CheckerPlugin()]
};
// Configuration for client-side bundle suitable for running in browsers
const clientBundleOutputDir = './wwwroot/dist';
const clientBundleConfig = merge(sharedConfig, {
entry: { 'main-client': './ClientApp/boot.browser.ts' },
output: { path: path.join(__dirname, clientBundleOutputDir) },
plugins: [
new webpack.DllReferencePlugin({
context: __dirname,
manifest: require('./wwwroot/dist/vendor-manifest.json')
})
].concat(isDevBuild ? [
// Plugins that apply in development builds only
new webpack.SourceMapDevToolPlugin({
filename: '[file].map', // Remove this line if you prefer inline source maps
moduleFilenameTemplate: path.relative(clientBundleOutputDir, '[resourcePath]') // Point sourcemap entries to the original file locations on disk
})
] : [
// Plugins that apply in production builds only
new webpack.optimize.UglifyJsPlugin(),
new AotPlugin({
tsConfigPath: './tsconfig.json',
entryModule: path.join(__dirname, 'ClientApp/app/app.browser.module#AppModule'),
exclude: ['./**/*.server.ts']
})
])
});
// Configuration for server-side (prerendering) bundle suitable for running in Node
const serverBundleConfig = merge(sharedConfig, {
resolve: { mainFields: ['main'] },
entry: { 'main-server': './ClientApp/boot.server.ts' },
plugins: [
new webpack.DllReferencePlugin({
context: __dirname,
manifest: require('./ClientApp/dist/vendor-manifest.json'),
sourceType: 'commonjs2',
name: './vendor'
})
].concat(isDevBuild ? [] : [
// Plugins that apply in production builds only
new AotPlugin({
tsConfigPath: './tsconfig.json',
entryModule: path.join(__dirname, 'ClientApp/app/app.server.module#AppModule'),
exclude: ['./**/*.browser.ts']
})
]),
output: {
libraryTarget: 'commonjs',
path: path.join(__dirname, './ClientApp/dist')
},
target: 'node',
externals: [nodeExternals()], // in order to ignore all modules in node_modules folder,
devtool: 'inline-source-map'
});
return [clientBundleConfig, serverBundleConfig];
};

GOT IT!
Before posting my solution, I'd like to thanks Aluan Haddad for his useful comment in my question above.
As suggested by Aluan, in fact, the problem was related to the need to use also a module loader, more than a module bundler.
So, the steps that I followed are these:
Installing requireJS ==> http://requirejs.org/docs/node.html
Removing externals: [nodeExternals()], // in order to ignore all modules in node_modules folder from my common webpack configuration and adding it under my server configuration (done before my question, but it's a really important step) [see webpack.config.js content in the question]
Adding target: 'node', before my externals point above, under my server side section (done before my question, but it's a really important step) [see webpack.config.js content in the question]
This makes sure that browser side keeps target:'web' (default target), and target becomes node just for the server.
launched webpack config vendor command manually from powershell webpack --config webpack.config.vendor.js
launched webpack config command manually from powershell webpack --config webpack.config.js
That worked for me! Hope It will works also for anyone else reading this question and encountering this issue!

webpack bundle.js not found - 404 error

I'm trying to learn Webpack configuration, and I keep getting errors in my console. It seems like my webpack app.bundle.js is not been found.
The page loads and the content of my html file displays, but not in the app.bundle.js or the html file in have in my dist directory, not untill i run mpm build.
below is the code for the webpack configuration and the error
// import node.js native path module
const path = require('path');
let webpack = require('webpack');
//require HtmlWebPackPlugin
const HtmlWebpackPlugin = require('html-webpack-plugin');
const ExtractTextPlugin = require('extract-text-webpack-plugin');
const port = process.env.PORT || 3000;
//define constant for paths
const paths ={
DIST: path.resolve(__dirname, 'dist'),
SRC: path.resolve(__dirname, 'src'),
JS: path.resolve(__dirname, 'src/js')
};
console.log(paths.DIST);
//webpack configuration
module.exports ={
entry: path.join(paths.JS, 'index.js'),
output: {
path: paths.DIST,
filename: 'app.bundle.js'
},
//set starting point for server
devServer: {
contentBase: paths.SRC,
host:'localhost',
port: port,
historyApiFallback: true,
open: true,
hot:true
},
//set webpack to use plugins
plugins: [
new HtmlWebpackPlugin({
template: path.join(paths.SRC, 'index.html'),
}),
new ExtractTextPlugin('style.bundle.css'),
new webpack.HotModuleReplacementPlugin()
],
//configure loaders
module: {
rules: [
//setup babel loader
{
test: /\.(js|jsx)$/,
exclude: /node_modules/,
use: [
'babel-loader',
],
},
//setup css loader
{
test: /\.css$/,
loader: ExtractTextPlugin.extract({
use: 'css-loader',
}),
},
{
test: /\.(png|jpg|gif)$/,
use: [
'file-loader',
],
},
],
},
//enable JS files without adding their extensions
resolve: {
extensions: ['.js', '.jsx'],
},
};
Here is the error on the browser console
Loading failed for the <script> with source “http://localhost:3000/js/app.bundle.js”
Source map error: request failed with status 404 Resource URL: http://localhost:3000/app.bundle.js Source Map URL: sockjs.js.map

The post is old but hopefully this helps some future person since I just solved a similar issue, here goes:
Ensure that the server root path and the output path makes sense for the files generating the 404 error.
Specifically, the server root path, set by "contentBase: paths.SRC" points to the SRC folder but the JS files are output to paths.DIST. When a browser attempts to access these files the URL it uses points to the wrong location. Fix by either changing content base to DIST, or adding publicPath: paths.DIST, which will override contentbase.
Link to references for contentBase, and publicPath.

The same error happened to me because i didn't run Webpack.
npx webpack
Run it on the same directory as Webpack configuration script.

Webpack - module not found even though module exists

This is a branch off of my previous question and applied suggestions. But I am still having major issues.
I now have my babel transpiler, along with a .babelrc file in place. My import code to import my module looks like this:
var init = require('./app/js/modules/toc');
init();
However I'm getting this:
ERROR in ./app/js/script.js
Module not found: Error: Cannot resolve 'file' or 'directory' ./app/js/modules/toc in /projects/project-root/app/js
# ./app/js/script.js 1:11-42
Webpack config:
var debug = process.env.NODE_ENV !== "production";
var webpack = require('webpack');
module.exports = {
context: __dirname,
devtool: debug ? "inline-sourcemap" : null,
entry: "./app/js/script.js",
module: {
rules: [{
test: /\.js$/,
use: 'babel-loader'
}]
},
output: {
path: __dirname + "public/javascripts",
filename: "scripts.min.js"
},
plugins: debug ? [] : [
new webpack.optimize.DedupePlugin(),
new webpack.optimize.OccurenceOrderPlugin(),
new webpack.optimize.UglifyJsPlugin({ mangle: false, sourcemap: false }),
],
};
.babelrc
{
"presets": ["es2015"]
}
Gulptask
//scripts task, also "Uglifies" JS
gulp.task('scripts', function() {
gulp.src('app/js/script.js')
.pipe(webpack(require('./webpack.config.js')))
.pipe(gulp.dest('public/javascripts'))
.pipe(livereload());
});
I'm totally lost...what am I doing wrong?
For my import code I also tried:
import {toc} from './modules/toc'
toc();
UPDATE: As recommended I needed to add resolve to my config. It looks like this now:
var debug = process.env.NODE_ENV !== "production";
var webpack = require('webpack');
module.exports = {
context: __dirname,
devtool: debug ? "inline-sourcemap" : null,
entry: "./app/js/script.js",
resolve: {
extensions: ['.js']
},
module: {
rules: [{
test: /\.js$/,
use: 'babel-loader'
}]
},
output: {
path: __dirname + "public/javascripts",
filename: "scripts.min.js"
},
plugins: debug ? [] : [
new webpack.optimize.DedupePlugin(),
new webpack.optimize.OccurenceOrderPlugin(),
new webpack.optimize.UglifyJsPlugin({ mangle: false, sourcemap: false }),
],
};
Sadly I still get:
ERROR in Entry module not found: Error: Cannot resolve 'file' or
'directory' ./app/js/script.js in /projects/project-root
Does my file structure need to change?

Whenever you import/require a module without specifying a file extension, you need to tell webpack how to resolve it. This is done by the resolve section inside the webpack config.
resolve: {
extensions: ['.js'] // add your other extensions here
}
As a rule of thumb: whenever webpack complains about not resolving a module, the answer probably lies in the resolve config.
Let me know about any further questions and if this works.
EDIT
resolve directly to the root level of your config:
// webpack.config.js
module.export = {
entry: '...',
// ...
resolve: {
extensions: ['.js']
}
// ...
};

You are specifying an entry point in your webpack config AND in gulp. Remove the entry property in your webpack config.
If you specify it twice, the gulp config will tell webpack to get the file in ./app/js/script.jsand then webpack in ./app/js/script.js which will result in a path like ./app/js/app/js/script.js.
Keep us posted if you fixed it. =)

Given that your script is located at ./app/js/script.js and the requested module is there ./app/js/modules/toc, you would need to call it relatively to your script => ./modules/toc should work.
This is because both your script and module are located in the jsfolder.

How to force Webpack 3 to throw TypeScript errors?

// index.ts
let a = 1;
a.map();
Webpack doesn't throw this TS error about method "map" on type "number.
Do you know how check these errors automatically during webpack build?
Can't find anything on the internet.
Previously I saw this: https://cloud.githubusercontent.com/assets/376414/7276837/840b4dec-e8da-11e4-8362-c44f531d8cd9.png
How can I get the same output of webpack (TS errors) using webpack 3?
TypeScript thinks it's ok (any valid JS is also valid TypeScript), so, any project could be bundled with any JS error.
If I'm running tsc app/index.ts then I see the error:
app/index.ts(8,3): error TS2339: Property 'map' does not exist on type 'number'.
So, TypeScript compiler throws the error, but webpack (ts-loader I think) ignores it.
I'm using webpack 3.8.1
Here is config:
let path = require('path'),
webpack = require('webpack'),
HtmlWebpackPlugin = require('html-webpack-plugin');
module.exports = {
entry: path.resolve('app/index.ts'),
output: {
path: path.resolve('dist'),
filename: 'app.js'
},
resolve: {
extensions: ['.js', '.vue', '.json', '.ts'],
alias: {
vue: path.resolve('node_modules/vue/dist/vue.js'),
app: path.resolve('app')
}
},
module:{
rules: [
{ test: /\.tsx$/, use: 'ts-loader' },
{ test: /\.vue$/, use: 'vue-loader' },
{ test: /\.pug$/, use: 'pug-loader' }
]
},
plugins: [
new HtmlWebpackPlugin({
template: path.resolve('app/index.pug'),
cache: false
}),
new webpack.LoaderOptionsPlugin({
debug: true
})
]
};

do you ever heard about linting? here's the loader for tslint for webpack