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Custom Routes must return an array

Why This Error Occurred​

When defining custom routes an array wasn't returned from either headers, rewrites, or redirects.

Possible Ways to Fix It​

Make sure to return an array that contains the routes.

Before

module.exports = {
  async rewrites() {
    return {
      source: '/feedback',
      destination: '/feedback/general',
    }
  },
}

After

module.exports = {
  async rewrites() {
    return [
      {
        source: '/feedback',
        destination: '/feedback/general',
      },
    ]
  },
}