Webpack when run in terminal it gives an "error error: unknown option '-p'"

Question

I wanted to run Webpack using npm run build but it gives an error in the terminal

error: unknown option '-p'
[webpack-cli] Run 'webpack --help' to see available commands and options
npm ERR! code ELIFECYCLE
C:\React Projects\Webpack\Project>

package.json

{
  "name": "project",
  "version": "1.0.0",
  "description": "",
  "main": "index.js",
  "dependencies": {
    "webpack": "^5.11.1"
  },
  "devDependencies": {
    "webpack-cli": "^4.3.1"
  },
  "scripts": {
    "test": "echo \"Error: no test specified\" && exit 1",
    "build": "webpack -p",
    "watch": "webpack --watch"
  },
  "author": "",
  "license": "ISC"
}

Solution

Looks like it was updated to be --mode production in a recent release.

https://github.com/webpack/webpack-cli/issues/1934

Comments

[Gerald Wichmann]

this worked for me. changed my webpack command in package.json from webpack -p --env production to webpack --mode production --env production