Homarr/apps/nextjs/src/env.mjs

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

export const env = createEnv({
  shared: {
    VERCEL_URL: z
      .string()
      .optional()
      .transform((url) => (url ? `https://${url}` : undefined)),
    PORT: z.coerce.number().default(3000),
    NODE_ENV: z.enum(["development", "production", "test"]).default("development"),
  },
  /**
   * Specify your server-side environment variables schema here. This way you can ensure the app isn't
   * built with invalid env vars.
   */
  server: {
    // Comma separated list of docker hostnames that can be used to connect to query the docker endpoints (localhost:2375,host.docker.internal:2375, ...)
    DOCKER_HOSTNAMES: z.string().optional(),
    DOCKER_PORTS: z.number().optional(),
  },
  /**
   * Specify your client-side environment variables schema here.
   * For them to be exposed to the client, prefix them with `NEXT_PUBLIC_`.
   */
  client: {
    // NEXT_PUBLIC_CLIENTVAR: z.string(),
  },
  /**
   * Destructure all variables from `process.env` to make sure they aren't tree-shaken away.
   */
  runtimeEnv: {
    VERCEL_URL: process.env.VERCEL_URL,
    PORT: process.env.PORT,
    NODE_ENV: process.env.NODE_ENV,
    DOCKER_HOSTNAMES: process.env.DOCKER_HOSTNAMES,
    DOCKER_PORTS: process.env.DOCKER_PORTS,
    // NEXT_PUBLIC_CLIENTVAR: process.env.NEXT_PUBLIC_CLIENTVAR,
  },
  skipValidation:
    Boolean(process.env.CI) || Boolean(process.env.SKIP_ENV_VALIDATION) || process.env.npm_lifecycle_event === "lint",
});