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Missing webpack config

Why This Error Occurred​

The value returned from the custom webpack function in your next.config.js was undefined. This can occur from the initial config value not being returned.

Possible Ways to Fix It​

Make sure to return the webpack config from your custom webpack function in your next.config.js

module.exports = {
  webpack: (config, { buildId, dev, isServer, defaultLoaders, webpack }) => {
    // Note: we provide webpack above so you should not `require` it
    // Perform customizations to webpack config
    config.plugins.push(new webpack.IgnorePlugin(/\/__tests__\//))

    // Important: return the modified config
    return config
  },
}