Ensure generateBuildId is not required in config type (#27443)
Ensure generateBuildId is not required in config type (#27443)


zeit/next.js,azukaru/next.js,flybayer/next.js,azukaru/next.js,flybayer/next.js,JeromeFitz/next.js,JeromeFitz/next.js,zeit/next.js,flybayer/next.js,JeromeFitz/next.js,flybayer/next.js,azukaru/next.js,JeromeFitz/next.js,azukaru/next.js,zeit/next.js