using @hs/webpack-graphql

package.json

{
  "devDependencies": {
    "@hs/webpack-graphql": "9.0.3",
    "webpack": "3",
    "webpack-dev-server": "2"
  }
}

webpack.config.js

const WebpackGraphql = require('@hs/webpack-graphql').default;

module.exports = {
  entry: './src/index.js',
  output: {
    filename: 'output.js',
  },
  devServer: {},
  plugins: [new WebpackGraphql({ path: '/api', typeDefs: [], resolvers: [] })],
};