webpack.config.js

// npm package build webpack config
const path = require('path');

module.exports = {
  mode: 'production',
  entry: path.resolve(__dirname, './src/index.tsx'),
  output: {
    path: path.join(__dirname, './lib'),
    filename: 'index.js',
    libraryTarget: 'commonjs2'
  },
  externals: {
    react: 'react'
  },
  resolve: {
    extensions: ['.tsx', '.ts', '.js'],
  },
  module: {
    rules: [
      {
        test: /\.tsx?$/,
        use: ['babel-loader']
      },
      {
        test: /\.tsx?$/,
        enforce: 'pre',
        exclude: /node_modules/,
        use: [
          { loader: 'tslint-loader' },
        ]
      },
      {
        test: /\.s?[ac]ss$/,
        use: ['style-loader', 'css-loader', 'sass-loader'],
      },
    ]
  },
  plugins: []
};