webpack.config.js

const path = require('path');
const WebpackUserscript = require('webpack-userscript');

module.exports = env => {
  return {
    entry: './src/inject.js',
    plugins: [
      new WebpackUserscript({
        headers: {
          'name': 'InjectJS',
          'version': env['NODE_ENV'] === 'development' ? '[version].build[buildNo]' : '[version]',
          'author': '[author]',
          'description': 'InjectJS allows user to inject custom JavaScript libraries and add JavaScript code to any web page.',
          'include': 'http*://*',
          'require': 'https://greasyfork.org/scripts/371339-gm-webextpref/code/GM_webextPref.js?version=623327',
          'grant': [
            'GM_getValue',
            'GM_setValue',
            'GM_deleteValue',
            'GM_registerMenuCommand',
            'GM_addValueChangeListener',
            'unsafeWindow'],
          'run-at': 'document-start',
          'noframes': true,
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        }
      })
    ],
    devServer: {
      contentBase: path.join(__dirname, 'dist')
    },
    output: {
      filename: 'inject.user.js',
      path: path.resolve(__dirname, 'dist')
    }
  }
};