import('next').NextConfig has required generateBuildId property

[stefanprobst]

What version of Next.js are you using?

11.0.2-canary.20

What version of Node.js are you using?

14.17.2

What browser are you using?

firefox

What operating system are you using?

ubuntu

How are you deploying your application?

vercel

Describe the Bug

in the current canary version, next exposes a config type at import('next').NextConfig. however, currently this has a required generateBuildId property, which should not be there i guess. it also seems to be missing the eslint config fields.

Expected Behavior

the config type at import('next').NextConfig should not have required properties (and include all possible configuration options)

To Reproduce

// next.config.js
/** @type {import('next').NextConfig} */
const config = {
  reactStrictMode: true,
};

module.exports = config;

[balazsorban44]

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