** This package is now deprecated and archived. It hasn't seen any development in the past 7 years and it's not something I use or maintain anymore. **

Uses the npm-check library to check for missing dependencies before running a webpack build. By default, if it finds any missing or outdated dependencies it will automatically run npm install before continuing with the build.

npm install npm-check-webpack-plugin

In webpack.config.js (or whatever file you have your webpack config in):

var NpmCheckPlugin = require('npm-check-webpack-plugin');
/* ES6:
   import NpmCheckPlugin from 'npm-check-webpack-plugin';
 */

module.exports =
  { //... webpack config
    plugins:
      [ new NpmCheckPlugin(/* { autoInstall: [false|true*] silent: [false*|true] }*/)
      ]
  };