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How to use a function in one file that was included globally with webpack

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.

Trying to add Scss to a React project built with Webpack but I cant get it working

I have a React App built using Webpack and I am now trying to make the project work with SCSS instead of CSS.
I have changed a few things from
test: /\.css$/, to
test: /\.(ccs|scss)$/, even tried
test: /\.scss$/, Still no luck, I have this also added
use: [
require.resolve("style-loader"),
{
loader: require.resolve("sass-loader"),
// loader: require.resolve("css-loader"),
options: {
importLoaders: 1
}
},
But it does not seem to pick up my SCSS when I run the project.
This is the webpack file ->
"use strict";
const autoprefixer = require("autoprefixer");
const path = require("path");
const webpack = require("webpack");
const HtmlWebpackPlugin = require("html-webpack-plugin");
const CaseSensitivePathsPlugin = require("case-sensitive-paths-webpack-plugin");
const InterpolateHtmlPlugin = require("react-dev-utils/InterpolateHtmlPlugin");
const WatchMissingNodeModulesPlugin = require("react-dev-utils/WatchMissingNodeModulesPlugin");
const eslintFormatter = require("react-dev-utils/eslintFormatter");
const ModuleScopePlugin = require("react-dev-utils/ModuleScopePlugin");
const getClientEnvironment = require("./env");
const paths = require("./paths");
// Webpack uses `publicPath` to determine where the app is being served from.
// In development, we always serve from the root. This makes config easier.
const publicPath = "/";
// `publicUrl` is just like `publicPath`, but we will provide it to our app
// as %PUBLIC_URL% in `index.html` and `process.env.PUBLIC_URL` in JavaScript.
// Omit trailing slash as %PUBLIC_PATH%/xyz looks better than %PUBLIC_PATH%xyz.
const publicUrl = "";
// Get environment variables to inject into our app.
const env = getClientEnvironment(publicUrl);
// This is the development configuration.
// It is focused on developer experience and fast rebuilds.
// The production configuration is different and lives in a separate file.
module.exports = {
// You may want 'eval' instead if you prefer to see the compiled output in DevTools.
// See the discussion in https://github.com/facebookincubator/create-react-app/issues/343.
devtool: "cheap-module-source-map",
// These are the "entry points" to our application.
// This means they will be the "root" imports that are included in JS bundle.
// The first two entry points enable "hot" CSS and auto-refreshes for JS.
entry: [
// Include an alternative client for WebpackDevServer. A client's job is to
// connect to WebpackDevServer by a socket and get notified about changes.
// When you save a file, the client will either apply hot updates (in case
// of CSS changes), or refresh the page (in case of JS changes). When you
// make a syntax error, this client will display a syntax error overlay.
// Note: instead of the default WebpackDevServer client, we use a custom one
// to bring better experience for Create React App users. You can replace
// the line below with these two lines if you prefer the stock client:
// require.resolve('webpack-dev-server/client') + '?/',
// require.resolve('webpack/hot/dev-server'),
require.resolve("react-dev-utils/webpackHotDevClient"),
// We ship a few polyfills by default:
require.resolve("./polyfills"),
// Errors should be considered fatal in development
require.resolve("react-error-overlay"),
// Finally, this is your app's code:
paths.appIndexJs
// We include the app code last so that if there is a runtime error during
// initialization, it doesn't blow up the WebpackDevServer client, and
// changing JS code would still trigger a refresh.
],
output: {
// Next line is not used in dev but WebpackDevServer crashes without it:
path: paths.appBuild,
// Add /* filename */ comments to generated require()s in the output.
pathinfo: true,
// This does not produce a real file. It's just the virtual path that is
// served by WebpackDevServer in development. This is the JS bundle
// containing code from all our entry points, and the Webpack runtime.
filename: "app/build/static/js/main.js",
// There are also additional JS chunk files if you use code splitting.
chunkFilename: "app/build/static/js/[name].chunk.js",
// This is the URL that app is served from. We use "/" in development.
publicPath: publicPath,
// Point sourcemap entries to original disk location
devtoolModuleFilenameTemplate: info =>
path.resolve(info.absoluteResourcePath)
},
resolve: {
// This allows you to set a fallback for where Webpack should look for modules.
// We placed these paths second because we want `node_modules` to "win"
// if there are any conflicts. This matches Node resolution mechanism.
// https://github.com/facebookincubator/create-react-app/issues/253
modules: ["node_modules", paths.appNodeModules].concat(
// It is guaranteed to exist because we tweak it in `env.js`
process.env.NODE_PATH.split(path.delimiter).filter(Boolean)
),
// These are the reasonable defaults supported by the Node ecosystem.
// We also include JSX as a common component filename extension to support
// some tools, although we do not recommend using it, see:
// https://github.com/facebookincubator/create-react-app/issues/290
extensions: [".js", ".json", ".jsx", ".scss"],
alias: {
// Support React Native Web
// https://www.smashingmagazine.com/2016/08/a-glimpse-into-the-future-with-react-native-for-web/
"react-native": "react-native-web"
},
plugins: [
// Prevents users from importing files from outside of src/ (or node_modules/).
// This often causes confusion because we only process files within src/ with babel.
// To fix this, we prevent you from importing files out of src/ -- if you'd like to,
// please link the files into your node_modules/ and let module-resolution kick in.
// Make sure your source files are compiled, as they will not be processed in any way.
new ModuleScopePlugin(paths.appSrc)
]
},
module: {
strictExportPresence: true,
rules: [
// TODO: Disable require.ensure as it's not a standard language feature.
// We are waiting for https://github.com/facebookincubator/create-react-app/issues/2176.
// { parser: { requireEnsure: false } },
// First, run the linter.
// It's important to do this before Babel processes the JS.
{
test: /\.(js|jsx)$/,
enforce: "pre",
// use: [
// {
// options: {
// formatter: eslintFormatter,
// },
// loader: require.resolve('eslint-loader'),
// },
// ],
include: paths.appSrc
},
// ** ADDING/UPDATING LOADERS **
// The "file" loader handles all assets unless explicitly excluded.
// The `exclude` list *must* be updated with every change to loader extensions.
// When adding a new loader, you must add its `test`
// as a new entry in the `exclude` list for "file" loader.
// "file" loader makes sure those assets get served by WebpackDevServer.
// When you `import` an asset, you get its (virtual) filename.
// In production, they would get copied to the `build` folder.
{
exclude: [
/\.html$/,
/\.(js|jsx)$/,
/\.css$/,
/\.json$/,
/\.bmp$/,
/\.gif$/,
/\.jpe?g$/,
/\.png$/
],
loader: require.resolve("file-loader"),
options: {
name: "static/media/[name].[hash:8].[ext]"
}
},
// "url" loader works like "file" loader except that it embeds assets
// smaller than specified limit in bytes as data URLs to avoid requests.
// A missing `test` is equivalent to a match.
{
test: [/\.bmp$/, /\.gif$/, /\.jpe?g$/, /\.png$/],
loader: require.resolve("url-loader"),
options: {
limit: 10000,
name: "static/media/[name].[hash:8].[ext]"
}
},
// Process JS with Babel.
{
test: /\.(js|jsx)$/,
include: paths.appSrc,
loader: require.resolve("babel-loader"),
options: {
// This is a feature of `babel-loader` for webpack (not Babel itself).
// It enables caching results in ./node_modules/.cache/babel-loader/
// directory for faster rebuilds.
cacheDirectory: true
}
},
// "postcss" loader applies autoprefixer to our CSS.
// "css" loader resolves paths in CSS and adds assets as dependencies.
// "style" loader turns CSS into JS modules that inject <style> tags.
// In production, we use a plugin to extract that CSS to a file, but
// in development "style" loader enables hot editing of CSS.
{
test: /\.(ccs|scss)$/,
use: [
require.resolve("style-loader"),
{
loader: require.resolve("sass-loader"),
// loader: require.resolve("css-loader"),
options: {
importLoaders: 1
}
},
{
loader: require.resolve("postcss-loader"),
options: {
ident: "postcss", // https://webpack.js.org/guides/migrating/#complex-options
plugins: () => [
require("postcss-flexbugs-fixes"),
autoprefixer({
browsers: [
">1%",
"last 4 versions",
"Firefox ESR",
"not ie < 9" // React doesn't support IE8 anyway
],
flexbox: "no-2009"
})
]
}
}
]
}
// ** STOP ** Are you adding a new loader?
// Remember to add the new extension(s) to the "file" loader exclusion list.
]
},
plugins: [
// Makes some environment variables available in index.html.
// The public URL is available as %PUBLIC_URL% in index.html, e.g.:
// <link rel="shortcut icon" href="%PUBLIC_URL%/favicon.ico">
// In development, this will be an empty string.
new InterpolateHtmlPlugin(env.raw),
// Generates an `index.html` file with the <script> injected.
// new HtmlWebpackPlugin({
// inject: true,
// template: paths.appHtml,
// }),
// Makes some environment variables available to the JS code, for example:
// if (process.env.NODE_ENV === 'development') { ... }. See `./env.js`.
new webpack.DefinePlugin(env.stringified),
// This is necessary to emit hot updates (currently CSS only):
new webpack.HotModuleReplacementPlugin(),
// Watcher doesn't work well if you mistype casing in a path so we use
// a plugin that prints an error when you attempt to do this.
// See https://github.com/facebookincubator/create-react-app/issues/240
new CaseSensitivePathsPlugin(),
// If you require a missing module and then `npm install` it, you still have
// to restart the development server for Webpack to discover it. This plugin
// makes the discovery automatic so you don't have to restart.
// See https://github.com/facebookincubator/create-react-app/issues/186
new WatchMissingNodeModulesPlugin(paths.appNodeModules),
// Moment.js is an extremely popular library that bundles large locale files
// by default due to how Webpack interprets its code. This is a practical
// solution that requires the user to opt into importing specific locales.
// https://github.com/jmblog/how-to-optimize-momentjs-with-webpack
// You can remove this if you don't use Moment.js:
new webpack.IgnorePlugin(/^\.\/locale$/, /moment$/)
],
// Some libraries import Node modules but don't use them in the browser.
// Tell Webpack to provide empty mocks for them so importing them works.
node: {
fs: "empty",
net: "empty",
tls: "empty"
},
// Turn off performance hints during development because we don't do any
// splitting or minification in interest of speed. These warnings become
// cumbersome.
performance: {
hints: false
}
};
Does anyone know why it is not currently working?
I have also installed node-sass & sass-loader, typically in a normal React app with node-sass it works straight away but as you can imagine since it was built with Webpack, I am not sure how to get it to work, any help will be appriciated! Thanks In Advance!

Webpack sees only javascript file that you use as entry. So if somewhere you have a folder with css files and links to them in your html, webpack has no idea of this. If you want your css to be compiled by webpack, in your entry js file you import your css files like this:
import './public/css/myfile.css';

Did you add the style.scss file in your index.js, style.scss is were you have imported all the variable.scss, components etc.
In index.js
import './styles/style.scss';

The answer was to modify my webpack from
test: /\.(ccs|scss)$/,
use: [
require.resolve("style-loader"),
{
loader: require.resolve("sass-loader"),
options: {
importLoaders: 1
}
},
To this below...
{
test:/\.(s*)css$/,
use:['style-loader','css-loader', 'sass-loader']
}

Getting a error from react that I dont understand, is it possible to use the XTK library in react?

Ive been using the XTK library for some scientific 3D modeling applications, and I am trying to use it in react. The library works flawlessly on its own in JavaScript but when I try to implement it in react it tells me that I need a loader for an unspecified file type. How would I figure out what the file type is? and why is this issue happening.
package docs: https://www.npmjs.com/package/xtk
here is the implementation of xtk in code:
var r = new window.X.renderer3D();
//r.container = 'r';
r.init();
// create a mesh from a .vtk file
var skull = new window.X.mesh();
skull.file = 'http://x.babymri.org/?avf.vtk';
// add the object
r.window.X.add(skull);
// .. and render it
r.render();
And here is the error message I am getting:
Ill go a ahead and add the webpack config as well at the recommendation of Nicholas Tower:
'use strict';
const autoprefixer = require('autoprefixer');
const path = require('path');
const webpack = require('webpack');
const HtmlWebpackPlugin = require('html-webpack-plugin');
const CaseSensitivePathsPlugin = require('case-sensitive-paths-webpack-plugin');
const InterpolateHtmlPlugin = require('react-dev-utils/InterpolateHtmlPlugin');
const WatchMissingNodeModulesPlugin = require('react-dev-utils/WatchMissingNodeModulesPlugin');
const eslintFormatter = require('react-dev-utils/eslintFormatter');
const ModuleScopePlugin = require('react-dev-utils/ModuleScopePlugin');
const getClientEnvironment = require('./env');
const paths = require('./paths');
var vtkRules = require('vtk.js/Utilities/config/dependency.js').webpack.v2.rules;
var entry = path.join(__dirname, './src/index.js');
const sourcePath = path.join(__dirname, './src');
const outputPath = path.join(__dirname, './dist');
// Webpack uses `publicPath` to determine where the app is being served from.
// In development, we always serve from the root. This makes config easier.
const publicPath = '/';
// `publicUrl` is just like `publicPath`, but we will provide it to our app
// as %PUBLIC_URL% in `index.html` and `process.env.PUBLIC_URL` in JavaScript.
// Omit trailing slash as %PUBLIC_PATH%/xyz looks better than %PUBLIC_PATH%xyz.
const publicUrl = '';
// Get environment variables to inject into our app.
const env = getClientEnvironment(publicUrl);
// This is the development configuration.
// It is focused on developer experience and fast rebuilds.
// The production configuration is different and lives in a separate file.
module.exports = {
// You may want 'eval' instead if you prefer to see the compiled output in DevTools.
// See the discussion in https://github.com/facebookincubator/create-react-app/issues/343.
devtool: 'cheap-module-source-map',
// These are the "entry points" to our application.
// This means they will be the "root" imports that are included in JS bundle.
// The first two entry points enable "hot" CSS and auto-refreshes for JS.
entry: [
// We ship a few polyfills by default:
require.resolve('./polyfills'),
// Include an alternative client for WebpackDevServer. A client's job is to
// connect to WebpackDevServer by a socket and get notified about changes.
// When you save a file, the client will either apply hot updates (in case
// of CSS changes), or refresh the page (in case of JS changes). When you
// make a syntax error, this client will display a syntax error overlay.
// Note: instead of the default WebpackDevServer client, we use a custom one
// to bring better experience for Create React App users. You can replace
// the line below with these two lines if you prefer the stock client:
// require.resolve('webpack-dev-server/client') + '?/',
// require.resolve('webpack/hot/dev-server'),
require.resolve('react-dev-utils/webpackHotDevClient'),
// Finally, this is your app's code:
paths.appIndexJs,
// We include the app code last so that if there is a runtime error during
// initialization, it doesn't blow up the WebpackDevServer client, and
// changing JS code would still trigger a refresh.
],
output: {
// Add /* filename */ comments to generated require()s in the output.
pathinfo: true,
// This does not produce a real file. It's just the virtual path that is
// served by WebpackDevServer in development. This is the JS bundle
// containing code from all our entry points, and the Webpack runtime.
filename: 'static/js/bundle.js',
// There are also additional JS chunk files if you use code splitting.
chunkFilename: 'static/js/[name].chunk.js',
// This is the URL that app is served from. We use "/" in development.
publicPath: publicPath,
// Point sourcemap entries to original disk location (format as URL on Windows)
devtoolModuleFilenameTemplate: info =>
path.resolve(info.absoluteResourcePath).replace(/\\/g, '/'),
},
resolve: {
// This allows you to set a fallback for where Webpack should look for modules.
// We placed these paths second because we want `node_modules` to "win"
// if there are any conflicts. This matches Node resolution mechanism.
// https://github.com/facebookincubator/create-react-app/issues/253
modules: ['node_modules', paths.appNodeModules].concat(
// It is guaranteed to exist because we tweak it in `env.js`
process.env.NODE_PATH.split(path.delimiter).filter(Boolean)
),
// These are the reasonable defaults supported by the Node ecosystem.
// We also include JSX as a common component filename extension to support
// some tools, although we do not recommend using it, see:
// https://github.com/facebookincubator/create-react-app/issues/290
// `web` extension prefixes have been added for better support
// for React Native Web.
extensions: ['.web.js', '.mjs', '.js', '.json', '.web.jsx', '.jsx'],
alias: {
// Support React Native Web
// https://www.smashingmagazine.com/2016/08/a-glimpse-into-the-future-with-react-native-for-web/
'react-native': 'react-native-web',
},
plugins: [
// Prevents users from importing files from outside of src/ (or node_modules/).
// This often causes confusion because we only process files within src/ with babel.
// To fix this, we prevent you from importing files out of src/ -- if you'd like to,
// please link the files into your node_modules/ and let module-resolution kick in.
// Make sure your source files are compiled, as they will not be processed in any way.
new ModuleScopePlugin(paths.appSrc, [paths.appPackageJson]),
],
},
module: {
strictExportPresence: true,
rules: [
// TODO: Disable require.ensure as it's not a standard language feature.
// We are waiting for https://github.com/facebookincubator/create-react-app/issues/2176.
// { parser: { requireEnsure: false } },
// First, run the linter.
// It's important to do this before Babel processes the JS.
{
test: /\.(js|jsx|mjs)$/,
enforce: 'pre',
use: [
{
options: {
formatter: eslintFormatter,
eslintPath: require.resolve('eslint'),
},
loader: require.resolve('eslint-loader'),
},
],
include: paths.appSrc,
},
{
// "oneOf" will traverse all following loaders until one will
// match the requirements. When no loader matches it will fall
// back to the "file" loader at the end of the loader list.
oneOf: [
// "url" loader works like "file" loader except that it embeds assets
// smaller than specified limit in bytes as data URLs to avoid requests.
// A missing `test` is equivalent to a match.
{
test: [/\.bmp$/, /\.gif$/, /\.jpe?g$/, /\.png$/],
loader: require.resolve('url-loader'),
options: {
limit: 10000,
name: 'static/media/[name].[hash:8].[ext]',
},
},
// Process JS with Babel.
{
test: /\.(js|jsx|mjs)$/,
include: paths.appSrc,
loader: require.resolve('babel-loader'),
options: {
// This is a feature of `babel-loader` for webpack (not Babel itself).
// It enables caching results in ./node_modules/.cache/babel-loader/
// directory for faster rebuilds.
cacheDirectory: true,
},
},
// "postcss" loader applies autoprefixer to our CSS.
// "css" loader resolves paths in CSS and adds assets as dependencies.
// "style" loader turns CSS into JS modules that inject <style> tags.
// In production, we use a plugin to extract that CSS to a file, but
// in development "style" loader enables hot editing of CSS.
{
test: /\.css$/,
use: [
require.resolve('style-loader'),
{
loader: require.resolve('css-loader'),
options: {
importLoaders: 1,
},
},
{
loader: require.resolve('postcss-loader'),
options: {
// Necessary for external CSS imports to work
// https://github.com/facebookincubator/create-react-app/issues/2677
ident: 'postcss',
plugins: () => [
require('postcss-flexbugs-fixes'),
autoprefixer({
browsers: [
'>1%',
'last 4 versions',
'Firefox ESR',
'not ie < 9', // React doesn't support IE8 anyway
],
flexbox: 'no-2009',
}),
],
},
},
],
},
{ test: entry, loader: "expose-loader?MyWebApp" },
{ test: /\.html$/, loader: 'html-loader' },
// "file" loader makes sure those assets get served by WebpackDevServer.
// When you `import` an asset, you get its (virtual) filename.
// In production, they would get copied to the `build` folder.
// This loader doesn't use a "test" so it will catch all modules
// that fall through the other loaders.
{
// Exclude `js` files to keep "css" loader working as it injects
// its runtime that would otherwise processed through "file" loader.
// Also exclude `html` and `json` extensions so they get processed
// by webpacks internal loaders.
exclude: [/\.(js|jsx|mjs)$/, /\.html$/, /\.json$/],
loader: require.resolve('file-loader'),
options: {
name: 'static/media/[name].[hash:8].[ext]',
},
},
]
},
// ** STOP ** Are you adding a new loader?
// Make sure to add the new loader(s) before the "file" loader.
].concat(vtkRules),
},
plugins: [
// Makes some environment variables available in index.html.
// The public URL is available as %PUBLIC_URL% in index.html, e.g.:
// <link rel="shortcut icon" href="%PUBLIC_URL%/favicon.ico">
// In development, this will be an empty string.
new InterpolateHtmlPlugin(env.raw),
// Generates an `index.html` file with the <script> injected.
new HtmlWebpackPlugin({
inject: true,
template: paths.appHtml,
}),
// Add module names to factory functions so they appear in browser profiler.
new webpack.NamedModulesPlugin(),
// Makes some environment variables available to the JS code, for example:
// if (process.env.NODE_ENV === 'development') { ... }. See `./env.js`.
new webpack.DefinePlugin(env.stringified),
// This is necessary to emit hot updates (currently CSS only):
new webpack.HotModuleReplacementPlugin(),
// Watcher doesn't work well if you mistype casing in a path so we use
// a plugin that prints an error when you attempt to do this.
// See https://github.com/facebookincubator/create-react-app/issues/240
new CaseSensitivePathsPlugin(),
// If you require a missing module and then `npm install` it, you still have
// to restart the development server for Webpack to discover it. This plugin
// makes the discovery automatic so you don't have to restart.
// See https://github.com/facebookincubator/create-react-app/issues/186
new WatchMissingNodeModulesPlugin(paths.appNodeModules),
// Moment.js is an extremely popular library that bundles large locale files
// by default due to how Webpack interprets its code. This is a practical
// solution that requires the user to opt into importing specific locales.
// https://github.com/jmblog/how-to-optimize-momentjs-with-webpack
// You can remove this if you don't use Moment.js:
new webpack.IgnorePlugin(/^\.\/locale$/, /moment$/),
],
// Some libraries import Node modules but don't use them in the browser.
// Tell Webpack to provide empty mocks for them so importing them works.
node: {
dgram: 'empty',
fs: 'empty',
net: 'empty',
tls: 'empty',
child_process: 'empty',
},
// Turn off performance hints during development because we don't do any
// splitting or minification in interest of speed. These warnings become
// cumbersome.
performance: {
hints: false,
},
};

error in including Cesium in webpack enabled project

I have a create-react-app nodejs app using:
npx create-react-app client
Added the Cesium library
cd client
npm install --save cesium
ejected the app:
npm run eject
and modified webpack config by following the instructions described in Cesium and Webpack
And I am getting the following error:
./src/index.js
Module not found: Can't resolve 'cesium/Cesium' in '/home/client/src'
the import statement in index.js is:
import Cesium from 'cesium/Cesium';
Any pointers to what I should do?
I commented out the ModuleScopePlugin statement in the plugins section.
As suggested in the cesium page, I added an alias like so:
const cesiumSource = 'node_modules/cesium/Source';
...
'cesium': path.resolve(__dirname, cesiumSource)
but apparently it is trying to import it from src.
I have pasted the whole webpack.config.prod.js file here:
'use strict';
const autoprefixer = require('autoprefixer');
const path = require('path');
const webpack = require('webpack');
const HtmlWebpackPlugin = require('html-webpack-plugin');
const CaseSensitivePathsPlugin = require('case-sensitive-paths-webpack-plugin');
const InterpolateHtmlPlugin = require('react-dev-utils/InterpolateHtmlPlugin');
const WatchMissingNodeModulesPlugin = require('react-dev-utils/WatchMissingNodeModulesPlugin');
const eslintFormatter = require('react-dev-utils/eslintFormatter');
const ModuleScopePlugin = require('react-dev-utils/ModuleScopePlugin');
const getClientEnvironment = require('./env');
const paths = require('./paths');
const CopywebpackPlugin = require('copy-webpack-plugin');
// Webpack uses `publicPath` to determine where the app is being served from.
// In development, we always serve from the root. This makes config easier.
const publicPath = '/';
// `publicUrl` is just like `publicPath`, but we will provide it to our app
// as %PUBLIC_URL% in `index.html` and `process.env.PUBLIC_URL` in JavaScript.
// Omit trailing slash as %PUBLIC_PATH%/xyz looks better than %PUBLIC_PATH%xyz.
const publicUrl = '';
// Get environment variables to inject into our app.
const env = getClientEnvironment(publicUrl);
// The path to the Cesium source code
const cesiumSource = 'node_modules/cesium/Source';
const cesiumWorkers = '../Build/Cesium/Workers';
// This is the development configuration.
// It is focused on developer experience and fast rebuilds.
// The production configuration is different and lives in a separate file.
module.exports = {
// You may want 'eval' instead if you prefer to see the compiled output in DevTools.
// See the discussion in https://github.com/facebookincubator/create-react-app/issues/343.
devtool: 'cheap-module-source-map',
// These are the "entry points" to our application.
// This means they will be the "root" imports that are included in JS bundle.
// The first two entry points enable "hot" CSS and auto-refreshes for JS.
entry: [
// We ship a few polyfills by default:
require.resolve('./polyfills'),
// Include an alternative client for WebpackDevServer. A client's job is to
// connect to WebpackDevServer by a socket and get notified about changes.
// When you save a file, the client will either apply hot updates (in case
// of CSS changes), or refresh the page (in case of JS changes). When you
// make a syntax error, this client will display a syntax error overlay.
// Note: instead of the default WebpackDevServer client, we use a custom one
// to bring better experience for Create React App users. You can replace
// the line below with these two lines if you prefer the stock client:
// require.resolve('webpack-dev-server/client') + '?/',
// require.resolve('webpack/hot/dev-server'),
require.resolve('react-dev-utils/webpackHotDevClient'),
// Finally, this is your app's code:
paths.appIndexJs,
// We include the app code last so that if there is a runtime error during
// initialization, it doesn't blow up the WebpackDevServer client, and
// changing JS code would still trigger a refresh.
],
output: {
// Add /* filename */ comments to generated require()s in the output.
pathinfo: true,
// This does not produce a real file. It's just the virtual path that is
// served by WebpackDevServer in development. This is the JS bundle
// containing code from all our entry points, and the Webpack runtime.
filename: 'static/js/bundle.js',
// There are also additional JS chunk files if you use code splitting.
chunkFilename: 'static/js/[name].chunk.js',
// This is the URL that app is served from. We use "/" in development.
publicPath: publicPath,
// Point sourcemap entries to original disk location (format as URL on Windows)
devtoolModuleFilenameTemplate: info => path.resolve(info.absoluteResourcePath).replace(/\\/g, '/'),
// Needed to compile multiline strings in Cesium
sourcePrefix: ''
},
amd: {
// Enable webpack-friendly use of require in Cesium
toUrlUndefined: true
},
resolve: {
// This allows you to set a fallback for where Webpack should look for modules.
// We placed these paths second because we want `node_modules` to "win"
// if there are any conflicts. This matches Node resolution mechanism.
// https://github.com/facebookincubator/create-react-app/issues/253
modules: ['node_modules', paths.appNodeModules].concat(
// It is guaranteed to exist because we tweak it in `env.js`
process.env.NODE_PATH.split(path.delimiter).filter(Boolean)
),
// These are the reasonable defaults supported by the Node ecosystem.
// We also include JSX as a common component filename extension to support
// some tools, although we do not recommend using it, see:
// https://github.com/facebookincubator/create-react-app/issues/290
// `web` extension prefixes have been added for better support
// for React Native Web.
extensions: ['.web.js', '.mjs', '.js', '.json', '.web.jsx', '.jsx'],
alias: {
// Support React Native Web
// https://www.smashingmagazine.com/2016/08/a-glimpse-into-the-future-with-react-native-for-web/
'react-native': 'react-native-web',
// Cesium module name
cesium: path.join(__dirname, cesiumSource)
},
plugins: [
// Prevents users from importing files from outside of src/ (or node_modules/).
// This often causes confusion because we only process files within src/ with babel.
// To fix this, we prevent you from importing files out of src/ -- if you'd like to,
// please link the files into your node_modules/ and let module-resolution kick in.
// Make sure your source files are compiled, as they will not be processed in any way.
//new ModuleScopePlugin(paths.appSrc, [paths.appPackageJson]),
],
},
module: {
strictExportPresence: true,
rules: [
// TODO: Disable require.ensure as it's not a standard language feature.
// We are waiting for https://github.com/facebookincubator/create-react-app/issues/2176.
// { parser: { requireEnsure: false } },
// First, run the linter.
// It's important to do this before Babel processes the JS.
{
test: /\.(js|jsx|mjs)$/,
enforce: 'pre',
use: [
{
options: {
formatter: eslintFormatter,
eslintPath: require.resolve('eslint'),
},
loader: require.resolve('eslint-loader'),
},
],
include: paths.appSrc,
},
{
// "oneOf" will traverse all following loaders until one will
// match the requirements. When no loader matches it will fall
// back to the "file" loader at the end of the loader list.
oneOf: [
// "url" loader works like "file" loader except that it embeds assets
// smaller than specified limit in bytes as data URLs to avoid requests.
// A missing `test` is equivalent to a match.
{
test: [/\.bmp$/, /\.gif$/, /\.jpe?g$/, /\.png$/, /\.svg$/, /\.xml$/],
loader: require.resolve('url-loader'),
options: {
limit: 10000,
name: 'static/media/[name].[hash:8].[ext]',
},
},
// Process JS with Babel.
{
test: /\.(js|jsx|mjs)$/,
include: paths.appSrc,
loader: require.resolve('babel-loader'),
options: {
// This is a feature of `babel-loader` for webpack (not Babel itself).
// It enables caching results in ./node_modules/.cache/babel-loader/
// directory for faster rebuilds.
cacheDirectory: true,
},
},
// "postcss" loader applies autoprefixer to our CSS.
// "css" loader resolves paths in CSS and adds assets as dependencies.
// "style" loader turns CSS into JS modules that inject <style> tags.
// In production, we use a plugin to extract that CSS to a file, but
// in development "style" loader enables hot editing of CSS.
{
test: /\.css$/,
use: [
require.resolve('style-loader'),
{
loader: require.resolve('css-loader'),
options: {
importLoaders: 1,
},
},
{
loader: require.resolve('postcss-loader'),
options: {
// Necessary for external CSS imports to work
// https://github.com/facebookincubator/create-react-app/issues/2677
ident: 'postcss',
plugins: () => [
require('postcss-flexbugs-fixes'),
autoprefixer({
browsers: [
'>1%',
'last 4 versions',
'Firefox ESR',
'not ie < 9', // React doesn't support IE8 anyway
],
flexbox: 'no-2009',
}),
],
},
},
],
},
// "file" loader makes sure those assets get served by WebpackDevServer.
// When you `import` an asset, you get its (virtual) filename.
// In production, they would get copied to the `build` folder.
// This loader doesn't use a "test" so it will catch all modules
// that fall through the other loaders.
{
// Exclude `js` files to keep "css" loader working as it injects
// its runtime that would otherwise processed through "file" loader.
// Also exclude `html` and `json` extensions so they get processed
// by webpacks internal loaders.
exclude: [/\.(js|jsx|mjs)$/, /\.html$/, /\.json$/],
loader: require.resolve('file-loader'),
options: {
name: 'static/media/[name].[hash:8].[ext]',
},
},
],
},
// ** STOP ** Are you adding a new loader?
// Make sure to add the new loader(s) before the "file" loader.
],
},
plugins: [
// Copy Cesium Assets, Widgets, and Workers to a static directory
new CopywebpackPlugin([ { from: path.join(cesiumSource, cesiumWorkers), to: 'Workers' } ]),
new CopywebpackPlugin([ { from: path.join(cesiumSource, 'Assets'), to: 'Assets' } ]),
new CopywebpackPlugin([ { from: path.join(cesiumSource, 'Widgets'), to: 'Widgets' } ]),
// Makes some environment variables available in index.html.
// The public URL is available as %PUBLIC_URL% in index.html, e.g.:
// <link rel="shortcut icon" href="%PUBLIC_URL%/favicon.ico">
// In development, this will be an empty string.
new InterpolateHtmlPlugin(env.raw),
// Generates an `index.html` file with the <script> injected.
new HtmlWebpackPlugin({
inject: true,
template: paths.appHtml,
}),
// Add module names to factory functions so they appear in browser profiler.
new webpack.NamedModulesPlugin(),
// Makes some environment variables available to the JS code, for example:
// if (process.env.NODE_ENV === 'development') { ... }. See `./env.js`.
new webpack.DefinePlugin(env.stringified),
// This is necessary to emit hot updates (currently CSS only):
new webpack.HotModuleReplacementPlugin(),
// Watcher doesn't work well if you mistype casing in a path so we use
// a plugin that prints an error when you attempt to do this.
// See https://github.com/facebookincubator/create-react-app/issues/240
new CaseSensitivePathsPlugin(),
// If you require a missing module and then `npm install` it, you still have
// to restart the development server for Webpack to discover it. This plugin
// makes the discovery automatic so you don't have to restart.
// See https://github.com/facebookincubator/create-react-app/issues/186
new WatchMissingNodeModulesPlugin(paths.appNodeModules),
// Moment.js is an extremely popular library that bundles large locale files
// by default due to how Webpack interprets its code. This is a practical
// solution that requires the user to opt into importing specific locales.
// https://github.com/jmblog/how-to-optimize-momentjs-with-webpack
// You can remove this if you don't use Moment.js:
new webpack.IgnorePlugin(/^\.\/locale$/, /moment$/)
],
// Some libraries import Node modules but don't use them in the browser.
// Tell Webpack to provide empty mocks for them so importing them works.
node: {
dgram: 'empty',
fs: 'empty',
net: 'empty',
tls: 'empty',
child_process: 'empty',
},
// Turn off performance hints during development because we don't do any
// splitting or minification in interest of speed. These warnings become
// cumbersome.
performance: {
hints: false,
},
};

Can you confirm you are using it with ES6?
If no, then first install ES6 because this statement import statement works with ES6.
import Cesium from 'cesium/Cesium';
If you are running it normally just after installing React then use this to import.
var Cesium = require('cesium/Cesium');
Use this link to setup app with ES6
- ECMAScript 6 application using Babel and Webpack

How to avoid webpack bundle all files in one? [duplicate]

So right now I'm working with a prototype where we're using a combination between webpack (for building .tsx files and copying .html files) and webpack-dev-server for development serving. As you can assume we are also using React and ReactDOM as a couple of library dependencies as well. Our current build output is the following structure:
dist
-favicon.ico
-index.html
-main.js
-main.js.map // for source-mapping between tsx / js files
This places ALL of the modules (including library dependencies into on big bundled file). I want the end result to look like this:
dist
-favicon.ico
-index.html
-appName.js
-appName.min.js
-react.js
-react.min.js
-reactDOM.js
-reactDOM.min.js
I have references to each of the libraries in index.html and in import statements in the .tsx files. So my question is this...
How do I go from webpack producing this gigantic bundled .js file to individual .js files (libraries included, without having to specify each individually)? **Bonus: I know how to do prod/dev environment flags, so how do I just minify those individual files (again without bundling them)?
current webpack.config:
var webpack = require("webpack"); // Assigning node package of webpack dependency to var for later utilization
var path = require("path"); // // Assigning node package of path dependency to var for later utilization
module.exports = {
entry: [
"./wwwroot/app/appName.tsx", // Starting point of linking/compiling Typescript and dependencies, will need to add separate entry points in case of not deving SPA
"./wwwroot/index.html", // Starting point of including HTML and dependencies, will need to add separate entry points in case of not deving SPA
"./wwwroot/favicon.ico" // Input location for favicon
],
output: {
path: "./dist/", // Where we want to host files in local file directory structure
publicPath: "/", // Where we want files to appear in hosting (eventual resolution to: https://localhost:4444/)
filename: "appName.js" // What we want end compiled app JS file to be called
},
// Enable sourcemaps for debugging webpack's output.
devtool: "source-map",
devServer: {
contentBase: './dist', // Copy and serve files from dist folder
port: 4444, // Host on localhost port 4444
// https: true, // Enable self-signed https/ssl cert debugging
colors: true // Enable color-coding for debugging (VS Code does not currently emit colors, so none will be present there)
},
resolve: {
// Add '.ts' and '.tsx' as resolvable extensions.
extensions: [
"",
".ico",
".js",
".ts",
".tsx",
".web.js",
".webpack.js"
]
},
module: {
loaders: [
// This loader copies the index.html file & favicon.ico to the output directory.
{
test: /\.(html|ico)$/,
loader: 'file?name=[name].[ext]'
},
// All files with a '.ts' or '.tsx' extension will be handled by 'ts-loader'.
{
test: /\.tsx?$/,
loaders: ["ts-loader"]
}
],
preLoaders: [
// All output '.js' files will have any sourcemaps re-processed by 'source-map-loader'.
{
test: /\.js$/,
loader: "source-map-loader"
}
]
},
// When importing a module whose path matches one of the following, just
// assume a corresponding global variable exists and use that instead.
// This is important because it allows us to avoid bundling all of our
// dependencies, which allows browsers to cache those libraries between builds.
// externals: {
// "react": "React",
// "react-dom": "ReactDOM",
// "redux": "Redux"
// }
};

Change the output setting to be name driven e.g.
entry: {
dash: 'app/dash.ts',
home: 'app/home.ts',
},
output: {
path: './public',
filename: 'build/[name].js',
sourceMapFilename: 'build/[name].js.map'
},

To expand upon #basarat's answer, you can use the glob package from node's standard library to build the "entry" config:
const glob = require("glob");
module.exports = [
{
target: "node",
entry: glob.sync("./src/**/*.test.{ts,tsx}").reduce((acc, file) => {
acc[file.replace(/^\.\/src\//, "")] = file;
return acc;
}, {}),
output: {
filename: "[name].js",
chunkFilename: "[name]-[id].js",
path: __dirname + "/dist"
},
//...
}
];
This builds files with the same name as their source, replacing .ts and .tsx with .js.

OPs answer copied out of the question
Ended up finding a solution that fit my needs, although, again, in that webpack-y way, requires some additional configuration. Still would like to make it a little more dynamic, but will perfect this at a later point in time. The resolution I was looking for was the ability to "chunk" common modules, but I stated it as filename given "entry"-points provided in webpack. I didn't mind some files being combined, where it made sense, but wanted overall files to be at a component-level given the project wasn't a SPA (single page application).
The additional code ended up being:
plugins: [
new webpack.optimize.CommonsChunkPlugin({ // This plugin is for extracting and created "chunks" (extracted parts of the code that are common and aren't page specific)
// One of these instances of plugins needs to be specified for EACH chunk file output desired
filename: "common.js", // Filename for this particular set of chunks to be stored
name: "common", // Entry point name given for where to pull all of the chunks
minChunks: 3 // Minimum number of chunks to be created
})
]
I also had to parameterize the entry points (see below for example), by variable name so that I could assign react, react-dom, and redux modules to common.js file.
entry: {
main: "./wwwroot/app/appName.tsx", // Starting point of linking/compiling Typescript and dependencies, will need to add separate entry points in case of not deving SPA
index: "./wwwroot/index.html", // Starting point of including HTML and dependencies, will need to add separate entry points in case of not deving SPA
favicon: "./wwwroot/favicon.ico", // Input location for favicon
common: [ "react", "react-dom", "redux" ] // All of the "chunks" to extract and place in common file for faster loading of common libraries between pages
},