vercel__flags/apps/docs/lib/geistdocs/site-url-warning.ts

import { siteUrlIssue } from "./site-url";

if (siteUrlIssue && process.env.NODE_ENV === "production") {
  process.emitWarning(
    `${siteUrlIssue}. Absolute site URLs will use http://localhost:3000.`,
    {
      code: "GEISTDOCS_SITE_URL_FALLBACK",
    }
  );
}