env.mjs

//credit: https://create.t3.gg/

/* eslint-disable @typescript-eslint/ban-ts-comment */
import { z } from "zod";

/**
 * Specify your server-side environment variables schema here.
 * This way you can ensure the app isn't built with invalid env vars.
 */
const server = z.object({
  DATABASE_URL: z.string().url(),
  NODE_ENV: z.enum(["development", "test", "production"]),
  SUPABASE_URL: z.string(),
  SUPABASE_ANON_KEY: z.string(),
  LEMON_KEY: z.string(),
  LEMON_STORE_ID: z.string(),
  LEMON_SIGN_SECRET: z.string(),
});

/**
 * You can't destruct `process.env` as a regular object in the Next.js
 * edge runtimes (e.g. middlewares) or client-side so we need to destruct manually.
 * @type {Record<keyof z.infer<typeof server>>}
 */
const processEnv = {
  DATABASE_URL: process.env.DATABASE_URL,
  NODE_ENV: process.env.NODE_ENV,
  SUPABASE_URL: process.env.SUPABASE_URL,
  SUPABASE_ANON_KEY: process.env.SUPABASE_ANON_KEY,
  LEMON_KEY: process.env.LEMON_KEY,
  LEMON_STORE_ID: process.env.LEMON_STORE_ID,
  LEMON_SIGN_SECRET: process.env.LEMON_SIGN_SECRET,
};

// Don't touch the part below
// --------------------------

/** @type z.infer<server>
 *  @ts-ignore - can't type this properly in jsdoc */
let env = process.env;

if (!!process.env.SKIP_ENV_VALIDATION == false) {
  const isServer = typeof window === "undefined";
  const parsed = server.safeParse(processEnv); // validate env vars

  if (parsed.success === false) {
    console.error(
      "❌ Invalid environment variables:",
      parsed.error.flatten().fieldErrors
    );
    throw new Error("Invalid environment variables");
  }
  /** @type z.infer<server>
   *  @ts-ignore - can't type this properly in jsdoc */
  env = new Proxy(parsed.data, {
    get(target, prop) {
      if (typeof prop !== "string") return undefined;
      // Throw a descriptive error if a server-side env var is accessed on the client
      // Otherwise it would just be returning `undefined` and be annoying to debug
      if (!isServer)
        throw new Error(
          process.env.NODE_ENV === "production"
            ? "❌ Attempted to access a server-side environment variable on the client"
            : `❌ Attempted to access server-side environment variable '${prop}' on the client`
        );
      /*  @ts-ignore - can't type this properly in jsdoc */
      return target[prop];
    },
  });
}

export { env };