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"TypeError: Nuxt is not a constructor" - when trying to use nuxt.js as a middleware

I followed this documentation page https://nuxtjs.org/api/nuxt-render/ but when I started the express server I received such response:

const nuxt = new Nuxt(config)
             ^
TypeError: Nuxt is not a constructor

This only happens under the 1.0.0-rc3 version, on 0.10.7 it works fine 😃

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