Cannot Find Module 'Webpack/Bin/Config-Yargs'

If you're using webpack-cli 4 or webpack 5, change webpack-dev-server to webpack serve.

Example:

"serve": "webpack serve --config config/webpack.dev.js --progress"

You might want also check this comment on GitHub:

NPM package.json scripts are a convenient and useful means to run locally installed binaries without having to be concerned about their full paths. Simply define a script as such:

For webpack-cli 3.x:

"scripts": {   "start:dev": "webpack-dev-server" }

For webpack-cli 4.x:

"scripts": {   "start:dev": "webpack serve" }

Jan 2021

Using webpack 5, just replace the webpack-dev-server command with webpack serve

Update: March 21

Try to update your webpack dependencies with the following command

npm install --save-dev webpack webpack-cli webpack-dev-server

if it does not work then use as following

I am having these dependencies but I faced the same issue

"webpack": "^5.6.0",
"webpack-cli": "^4.2.0",
"webpack-dev-server": "^3.11.0"

And I found a solution that adding a new script or in your Start Script in package.json worked for me. So you can try this way as well.

"dev": "webpack serve --mode development --env development"

This is because of the changes in webpack-cli version.

1. If the webpack-cli version is less than 4.x, You can use webpack-dev-server
2. If the webpack-cli version is 4.x or higher, you can use webpack serve

For webpack-cli 3.x and below

    "scripts": {
      "dev-server": "webpack-dev-server"
    }

For webpack-cli 4.x and above

    "scripts": {
      "dev-server": "webpack serve"
    }

    "scripts": {
      "dev-server": "webpack serve "
    }

Source: webpack dev-server

Solution

package.json

"scripts": {
    "startdev": "webpack serve --mode development --env development --hot --port 3000"
    ...
    ...
  },
"devDependencies": {
...
    "webpack": "^5.10.1",
    "webpack-cli": "^4.2.0"
 },

Console

$ npm run startdev

Try changing the webpack version from 1.x to 2.x in your package.json:

Eg:

 "devDependencies": {
    "webpack": "2.2.0-rc.3",
    "webpack-dev-server": "2.1.0-beta.0",
    "webpack-validator": "^2.3.0"
  }

This happens sometimes when you use pre-release version of webpack-dev-server with released version of webpack or viceversa.

The issue is with newer webpack-cli version. If webpack-cli <= 3.x webpack-dev-server package work fine. For webpack-cli >= 4.x, use npx webpack serve command to run local server.

For webpack-cli 3.x:
"scripts": {
  "start:dev": "webpack-dev-server --mode=development"
}

For webpack-cli 4.x:
"scripts": {
  "start:dev": "webpack serve --mode=development"
}

I forgot to install webpack-cli. So I ran below command and issue got fixed.

npm i -D webpack-cli

Update your Webpack version (and webpack CLI):

npm install --save-dev webpack webpack-cli webpack-dev-server webpack-merge

If you don't use one of those mentioned above, feel free to omit.

I also go this error when I had only installed webpack locally and hadn't installed it globally yet.

I had webpack-dev-server installed globally though and it had a dependency on a global install of webpack. To be fair npm did complain while installing webpack-dev-server:

UNMET PEER DEPENDENCY webpack@^2.2.0

I solved this by creating a script command on package.json.

"dev": "webpack serve --config webpack.config.js --open",

In my case the solution was just use previous versions -

"webpack": "^4.44.1",
"webpack-cli": "^3.3.12",
"webpack-dev-server": "^3.11.0"

The general situation is due to Webpack and webpack-dev-server version is not compatible. Like I also have this problem, my computer's webpack is 1.15.0, but webpack-dev-server is 2.x above version. So I uninstall webpack-dev-server: npm uninstall webpack-dev-server -g Then install the 1.15.0 version of webpack-dev-server, you can solve this problem by npm install webpack-dev-server@1.15.0 -g

Try changing webpack version to 3.0 and web-dev-server to 2.7.1

Eg:

"devDependencies": {
    "webpack": "^3.0.0",
    "webpack-cli": "2.0.13",
    "webpack-config-utils": "2.0.0",
    "webpack-dev-server": "^2.7.1",
    "webpack-validator": "2.2.7"
}

I had the same problem with webpack 4.

It is version compatible issue.

To fix the issue run following command to install webpack-cli in web pack 4 .

 yarn add webpack-cli -D

I've had a similar problem. I think it's related to webpack version.

UPDATE JULY 2021

People who have versions of "webpack-cli": "^4 or above", & "webpack": "^5 or above",.

You can give a try updating your webpack version by this command

npm install --save-dev webpack webpack-cli webpack-dev-server

Now go to you package.json, under scrpits add this line

"dev": "webpack serve --mode development --env development"

This totally worked for me.

Deprecate the webpack-cli version by using the command :

npm install -D webpack-cli@3

The new version is in the Beta phase and likely to fix this bug.

I fixed this solution by running npm start which was just a wrapper running 'webpack-dev-server' rather than running webpack-dev-server directly into the console. The problem was that I was passing options into a method I should not have been passing options into.

Running webpack-dev-server with npm start showed me the correct error message. Running webpack-dev-server directly only gave me "Error: Cannot find module 'webpack/bin/config-yargs' ". Weird.

I am on: "webpack": "^2.6.1", "webpack-dev-server": "^2.7.1"

I had got the following dependencies installed (without specifying any particular version)

 "webpack-cli": "^4.5.0",
 "webpack-dev-server": "^3.11.2"

This error appears during the yarn start with the following entry in package.json specific to the scripts.start attr.

 "scripts": {
    "start": "webpack-dev-server --open",
    "build": "webpack"
  }

So, it turns out that webpack-dev-server --open is looking for webpack-cli version 3.3. I got rid of this error by installing the specific version of webpack-cli The working package.json looks like this:

  "webpack-cli": "3.3",
  "webpack-dev-server": "^3.11.2"

But, if you don't want to downgrade the webpack-cli version, update the "start": "webpack-dev-server --open" to "start": "webpack serve --open"

This is usually due to version mismatches between libraries (including webpack/yargs, in your case). This can happen a lot when you have left a project sitting for a while and some dependencies in your node_modules directory have become stale. A very simple solution, before fussing with different versions of everything, is to just move your node_modules directory to a temporary location and re-run npm install:

% mv node_modules nod_modules.REMOVED
% npm install

Then, try rerunning webpack.

To upgrade all packages (afer installing webpack-cli and webpack-dev-server), you can

npm --depth=9999 upgrade

That should fix the nonmatching version problem.

Please use webpack serve for run webpack-dev-server

webpack serve --config config/webpack.dev.js --progress --profile --watch --content-base src/

It's webpack versioning problem You need to update your webpack using this command

npm install --save-dev webpack webpack-cli webpack-dev-server

Now in package.json file use

"dev": "webpack serve --config webpack.config.js --open"

I tried the following lines and it was solved:

1. As the issue is with webpack-dev-server so goto node-modules.
2. find webpack-dev-server then goto dependencies
3. check the dependency info of webpack and webpack-cli and their versions.
4. Reinstall those names with the exact same versions.

Then try re-running the dev-server.

In my case: "dev-server": "webpack-dev-server --open"

console: npm run dev-server

-> So, first do you exclude the node_modules folder.
->after verificad if in the archive package.json the dependencies : "webpack", "webpack-cli" and "webpack-dev-server" they are in "dependencies":{}.
-> The end, Open the terminal execute the command : yarn. the install all depends again that was excluded.

Changing the command from "serve": "webpack-dev-server" to "serve":"webpack serve" solved this issue. I've tried this solution with webpack dev server v3.11.0 and v3.11.2; both worked fine.

use webpack serve instead of webpack-dev-server in your package.json under scripts. it perfectly work for me. I had the same error and this fixed it.

my devDependencies:

"webpack": "^5.22.0",
"webpack-cli": "^4.5.0",
"webpack-dev-server": "^3.11.2"

original post :

I just solved it.

The problem was on path on index.html.

from:

<script src="./dist/myBundle.js"></script>

to:

<script src="myBundle.js"></script>

None of the above answers worked for me. If you are still getting this error, you can try this, this fixed my problem:

Open node_modules\webpack-dev-server\bin\webpack-dev-server.js

Change Line 84: require('webpack-cli/bin/config-yargs')(yargs);

To:

require('webpack-cli/bin/config/config-yargs')(yargs);

Change Line 92: const config = require('webpack-cli/bin/convert-argv')(yargs, argv, {

To:

const config = require('webpack-cli/bin/utils/convert-argv')(yargs, argv, {