Cannot find module 'webpack-cli'

Question

I want to make es6 into my project so I used this tutorial this tutorial and when i try to write 'webpack' in cmd I get the error

    Done in 8.99s.
{ Error: Cannot find module 'webpack-cli'
    at Function.Module._resolveFilename (module.js:470:15)
    at Function.Module._load (module.js:418:25)
    at Module.require (module.js:498:17)
    at require (internal/module.js:20:19)
    at runCommand.then.result (C:\Users\adirz\AppData\Roaming\npm\node_modules\webpack\bin\webpack.js:62:14)
    at process._tickCallback (internal/process/next_tick.js:109:7) code: 'MODULE_NOT_FOUND' }

package.json

   {
  "name": "functions",
  "scripts": {
    "build": "tsc",
    "serve": "npm run build && firebase serve --only functions",
    "shell": "npm run build && firebase functions:shell",
    "start": "npm run shell",
    "deploy": "firebase deploy --only functions",
    "logs": "firebase functions:log"
  },
  "main": "lib/index.js",
  "dependencies": {
    "firebase-admin": "~5.12.0",
    "firebase-functions": "^1.0.1"
  },
  "devDependencies": {
    "ts-loader": "^4.2.0",
    "typescript": "^2.5.3",
    "webpack": "^4.5.0",
    "webpack-cli": "^2.0.14",
    "webpack-node-externals": "^1.7.2"
  },
  "private": true
}

my folder structure

Answer 1

Try using: npm i -g webpack-cli.

Here is the official issue on github: https://github.com/webpack/webpack-cli/issues/191

Answer 2

Link globally installed package to your project

npm link webpack-cli

Answer 3

This solved the problem for me

sudo chown -R $USER /usr/local/lib/node_modules
npm i -g webpack-cli

https://flaviocopes.com/npm-fix-missing-write-access-error/

Answer 4

The problem for me it was that I was not using 'sudo' permissions. If you are using linux based system try typing sudo npm i -g webpack-cli