Homarr/packages/auth/env.mjs

import { createEnv } from "@t3-oss/env-nextjs";
import { z } from "zod";

export const env = createEnv({
  server: {
    AUTH_SECRET:
      process.env.NODE_ENV === "production"
        ? z.string().min(1)
        : z.string().min(1).optional(),
    AUTH_URL: z.preprocess(
      // This makes Vercel deployments not fail if you don't set NEXTAUTH_URL
      // Since NextAuth.js automatically uses the VERCEL_URL if present.
      (str) => process.env.VERCEL_URL ?? str,
      // VERCEL_URL doesn't include `https` so it cant be validated as a URL
      process.env.VERCEL ? z.string() : z.string().url(),
    ),
  },
  client: {},
  runtimeEnv: {
    AUTH_SECRET: process.env.AUTH_SECRET,
    AUTH_URL: process.env.AUTH_URL,
  },
  skipValidation:
    Boolean(process.env.CI) || Boolean(process.env.SKIP_ENV_VALIDATION),
});