How to include uglify-js?

Question

Node.js

Hello, in package.json :

...
"devDependencies": {
    "axios": "^0.15.3",
    "cross-env": "^3.2.3",
    "jquery": "^3.1.1",
    "laravel-mix": "0.*",
    "uglifyjs-webpack-plugin": "*",
    "uglify-js": "*"
  }

Then when npm list I get:

...
npm ERR! missing: [email protected]^2.8.27, required by [email protected]
npm ERR! missing: [email protected]^2.8.5, required by [email protected]

I tried to force versions to be specified in dependencies, it did not help :(