Vercel system environment variables.

vercel.d.ts

declare namespace NodeJS {
  interface ProcessEnv {
    readonly VERCEL?: '1'
    readonly CI?: '1'

    readonly VERCEL_REGION?:
      | 'arn1'
      | 'bom1'
      | 'cdg1'
      | 'cle1'
      | 'dub1'
      | 'gru1'
      | 'hkg1'
      | 'hnd1'
      | 'iad1'
      | 'icn1'
      | 'lhr1'
      | 'pdx1'
      | 'sfo1'
      | 'sin1'
      | 'syd1'
      | 'dev1'

    readonly VERCEL_ENV?: 'development' | 'production' | 'preview'
    readonly VERCEL_URL?: string
    readonly VERCEL_GIT_PROVIDER?: string
    readonly VERCEL_GIT_REPO_SLUG?: string
    readonly VERCEL_GIT_REPO_OWNER?: string
    readonly VERCEL_GIT_REPO_ID?: string
    readonly VERCEL_GIT_COMMIT_REF?: string
    readonly VERCEL_GIT_COMMIT_SHA?: string
    readonly VERCEL_GIT_COMMIT_MESSAGE?: string
    readonly VERCEL_GIT_COMMIT_AUTHOR_LOGIN?: string
    readonly VERCEL_GIT_COMMIT_AUTHOR_NAME?: string
    readonly NEXT_PUBLIC_VERCEL_ENV?: 'development' | 'production' | 'preview'
    readonly NEXT_PUBLIC_VERCEL_URL?: string
    readonly NEXT_PUBLIC_VERCEL_GIT_PROVIDER?: string
    readonly NEXT_PUBLIC_VERCEL_GIT_REPO_SLUG?: string
    readonly NEXT_PUBLIC_VERCEL_GIT_REPO_OWNER?: string
    readonly NEXT_PUBLIC_VERCEL_GIT_REPO_ID?: string
    readonly NEXT_PUBLIC_VERCEL_GIT_COMMIT_REF?: string
    readonly NEXT_PUBLIC_VERCEL_GIT_COMMIT_SHA?: string
    readonly NEXT_PUBLIC_VERCEL_GIT_COMMIT_MESSAGE?: string
    readonly NEXT_PUBLIC_VERCEL_GIT_COMMIT_AUTHOR_LOGIN?: string
    readonly NEXT_PUBLIC_VERCEL_GIT_COMMIT_AUTHOR_NAME?: string
  }
}