🌟 Initialize repo

src/env/schema.mjs

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+// @ts-check
+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.
+ */
+export const serverSchema = z.object({
+  DATABASE_URL: z.string().url(),
+  NODE_ENV: z.enum(["development", "test", "production"]),
+  NEXTAUTH_SECRET:
+    process.env.NODE_ENV === "production"
+      ? z.string().min(1)
+      : z.string().min(1).optional(),
+  NEXTAUTH_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(),
+  ),
+  DISCORD_CLIENT_ID: z.string(),
+  DISCORD_CLIENT_SECRET: z.string(),
+});
+
+/**
+ * You can't destruct `process.env` as a regular object in the Next.js
+ * middleware, so you have to do it manually here.
+ * @type {{ [k in keyof z.input<typeof serverSchema>]: string | undefined }}
+ */
+export const serverEnv = {
+  DATABASE_URL: process.env.DATABASE_URL,
+  NODE_ENV: process.env.NODE_ENV,
+  NEXTAUTH_SECRET: process.env.NEXTAUTH_SECRET,
+  NEXTAUTH_URL: process.env.NEXTAUTH_URL,
+  DISCORD_CLIENT_ID: process.env.DISCORD_CLIENT_ID,
+  DISCORD_CLIENT_SECRET: process.env.DISCORD_CLIENT_SECRET,
+};
+
+/**
+ * Specify your client-side environment variables schema here.
+ * This way you can ensure the app isn't built with invalid env vars.
+ * To expose them to the client, prefix them with `NEXT_PUBLIC_`.
+ */
+export const clientSchema = z.object({
+  // NEXT_PUBLIC_CLIENTVAR: z.string(),
+});
+
+/**
+ * You can't destruct `process.env` as a regular object, so you have to do
+ * it manually here. This is because Next.js evaluates this at build time,
+ * and only used environment variables are included in the build.
+ * @type {{ [k in keyof z.input<typeof clientSchema>]: string | undefined }}
+ */
+export const clientEnv = {
+  // NEXT_PUBLIC_CLIENTVAR: process.env.NEXT_PUBLIC_CLIENTVAR,
+};