Node module included in babel-loader is not defined in Webpack 5

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10 Answers

includedbabelloaderdefinedwebpackmodule
90%

I have the same problem but only when using --hot with webpack-dev-server.,Unfortunately i could not find a fix for that but figured out that the problem seems to be with exports field in package.json of nanoid since version 3.,It seems that some package, webpack?, webpack-dev-server?, others..?, involved in hot loading does not properly resolve the exports field.

/n

I have the same problem but only when using --hot with webpack-dev-server.

--hot
/n

I have the same problem but only when using --hot with webpack-dev-server.

webpack - dev - server
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88%

You need to add a plugin to define your env (in webpack config):

   plugins: [
      new webpack.DefinePlugin({
         'process.env.NODE_ENV': JSON.stringify('development')
      })
   ],
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webpack documentation: Loaders,Within your webpack configuration object, you'll need to add the babel-loader to the list of modules, like so:,webpack 4.x | babel-loader 8.x | babel 7.x

webpack 4.x | babel-loader 8.x | babel 7.x

npm install - D babel - loader @babel / core @babel / preset - env webpack
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Node/npm version: Node 8/npm 6.4.1,Babel version(s): "@babel/polyfill": "^7.2.5",Expected behavior/code no ReferenceError is thrown

index.js: 25 Uncaught ReferenceError: global is not defined
at Object.../node_modules/@babel / polyfill / lib / index.js(index.js: 25)
at __webpack_require__(bootstrap: 22)
at fn(hot module replacement: 64)
at Module.. / src / index / globals -
   import.ts(error - handler.js: 37)
at __webpack_require__(bootstrap: 22)
at fn(hot module replacement: 64)
at Module.. / src / index / index.js(globals -
   import.ts: 15)
at __webpack_require__(bootstrap: 22)
at bootstrap: 47
at bootstrap: 47
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75%

webpack 4.x || 5.x | babel-loader 8.x | babel 7.x,webpack documentation: Loaders,Within your webpack configuration object, you'll need to add the babel-loader to the list of modules, like so:

npm install - D babel - loader @babel / core @babel / preset - env webpack
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40%

Webpack allows you to define externals - modules that should not be bundled.,npm i webpack-node-externals,Webpack allows inserting regex in the externals array, to capture non-relative modules:

npm install webpack - node - externals--save - dev
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22%

in web app. According to https://github.com/liady/webpack-node-externals it is only for backend. Since you use nodeExternals in web app you get CommonJS modules, that expects built in node require function. So just remove it to fix error.,Maybe it will be helpful for someone. Add into call nodeExternals option importType with value 'umd'.

You should not use

externals: [nodeExternals()],
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In Node.js, one of today’s most popular JavaScript frameworks, module bundlers allow loading NPM modules in web browsers, and component-oriented libraries (like React) encourage and facilitate modularization of JavaScript code.,Both JavaScript bundles can share common libraries and components. For that, we can use CommonsChunkPlugin, which finds modules that occur in multiple entry chunks and creates a shared bundle that can be cached among multiple pages.,If the user enters either the /dashboard or /admin URL, only the corresponding required JavaScript bundle is loaded. Below we can see examples with and without the client-side router.

Let’s say we have the following project structure:

-Project
   -
   node_modules -
   bower_modules -
   src -
   script -
   components -
   Modal.js -
   Navigation.js -
   containers -
   Home.js -
   Admin.js
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48%

string | Array<string> | { [string]: string }, defaults to the top-level targets option if no browserslist-related option is specified in @babel/preset-env's docs, otherwise to {}.,This option configures how @babel/preset-env handles polyfills.,@babel/preset-typescript

With npm:

npm install--save - dev @babel / preset - env

Or yarn:

yarn add @babel / preset - env--dev

For example, to only include polyfills and code transforms needed for users whose browsers have >0.25% market share (ignoring browsers without security updates like IE 10 and BlackBerry):

{
   "presets": [
      [
         "@babel/preset-env",
         {
            "useBuiltIns": "entry"
         }
      ]
   ]
}

browserslist

> 0.25 %
   not dead

package.json

"browserslist": "> 0.25%, not dead"

This can either be a browserslist-compatible query (with caveats):

{
   "targets": "> 0.25%, not dead"
}

Or an object of minimum environment versions to support:

{
   "targets": {
      "chrome": "58",
      "ie": "11"
   }
}

We don't recommend using preset-env this way because it doesn't take advantage of its ability to target specific environments/versions.

{
   "presets": ["@babel/preset-env"]
}

Because of this, preset-env's behavior is different than browserslist: it does not use the defaults query when no targets are found in your Babel or browserslist config(s). If you want to use the defaults query, you will need to explicitly pass it as a target:

{
   "presets": [
      ["@babel/preset-env", {
         "targets": "defaults"
      }]
   ]
}

You may also target browsers supporting ES Modules (https://www.ecma-international.org/ecma-262/6.0/#sec-modules). When the esmodules target is specified, the browsers target and browserslist's targets will be ignored. It is different, however, from top level targets.esmodules option for backward compat reasons. You can use this approach in combination with <script type="module"></script> to conditionally serve smaller scripts to users (https://jakearchibald.com/2017/es-modules-in-browsers/#nomodule-for-backwards-compatibility).

{
   "presets": [
      [
         "@babel/preset-env",
         {
            "targets": {
               "esmodules": true
            }
         }
      ]
   ]
}

Since @babel/polyfill was deprecated in 7.4.0, we recommend directly adding core-js and setting the version via the corejs option.

npm install core - js @3--save

# or

npm install core - js @2--save

In

import "core-js";

Out (different based on environment)

import "core-js/modules/es.string.pad-start";
import "core-js/modules/es.string.pad-end";

In

import "core-js/es/array";
import "core-js/proposals/math-extensions";

Out (different based on environment)

import "core-js/modules/es.array.unscopables.flat";
import "core-js/modules/es.array.unscopables.flat-map";
import "core-js/modules/esnext.math.clamp";
import "core-js/modules/esnext.math.deg-per-rad";
import "core-js/modules/esnext.math.degrees";
import "core-js/modules/esnext.math.fscale";
import "core-js/modules/esnext.math.rad-per-deg";
import "core-js/modules/esnext.math.radians";
import "core-js/modules/esnext.math.scale";

a.js

var a = new Promise();

b.js

var b = new Map();

a.js

import "core-js/modules/es.promise";
var a = new Promise();

b.js

import "core-js/modules/es.map";
var b = new Map();

a.js

var a = new Promise();

b.js

var b = new Map();

With Babel 7's JavaScript config file support, you can force all transforms to be run if env is set to production.

module.exports = function(api) {
   return {
      presets: [
         [
            "@babel/preset-env",
            {
               targets: {
                  chrome: 59,
                  edge: 13,
                  firefox: 50,
               },
               // for uglifyjs...
               forceAllTransforms: api.env("production"),
            },
         ],
      ],
   };
};
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Loaders: by default, webpack only understands JavaScript and JSON files. To process other types of files and convert them into valid modules, webpack uses loaders. Loaders transform the source code of non-JavaScript modules, allowing us to preprocess those files before they’re added to the dependency graph. For example, a loader can transform files from a CoffeeScript language to JavaScript or inline images to data URLs. With loaders we can even import CSS files directly from our JavaScript modules.,As you can see, the modern ES6 features (the arrow function and the const declaration) from component.js module are not transformed to ES5-compliant code by default. To make our code work in older browsers, we must add the Babel loader:,If we now change any of the source files and save them, the web server will automatically reload the page after the code has been compiled. Try to change the color property in our CSS file to green, for example, and you should see how the color is updated appropriately in the page.

Pretag
. / src / index.js
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