webpack.dev.js

const common = require('./webpack.common');
const merge = require('webpack-merge');
const HtmlWebpackPlugin = require('html-webpack-plugin');
const autoprefixer = require('autoprefixer');

module.exports = merge(common, {
  mode: 'development',
  module: {
    rules: [
      {
        test: /\.scss$/,
        use: [
          { loader: 'style-loader' },
          { loader: 'css-loader' },
          {
            loader: 'postcss-loader',
            options: {
              plugins: () => [
                autoprefixer({ overrideBrowserslist: ['> 1%', 'IE >= 10'] })
              ]
            }
          },
          { loader: 'sass-loader' }
        ]
      }
    ]
  },
  plugins: [new HtmlWebpackPlugin({ template: './src/index.html' })]
});