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env.mjs
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env.mjs
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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"]),
});
/**
* 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_`.
*/
const client = z.object({
// NEXT_PUBLIC_CLIENTVAR: z.string().min(1),
});
/**
* 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> | keyof z.infer<typeof client>, string | undefined>}
*/
const processEnv = {
DATABASE_URL: process.env.DATABASE_URL,
NODE_ENV: process.env.NODE_ENV,
// NEXT_PUBLIC_CLIENTVAR: process.env.NEXT_PUBLIC_CLIENTVAR,
};
// Don't touch the part below
// --------------------------
const merged = server.merge(client);
/** @typedef {z.input<typeof merged>} MergedInput */
/** @typedef {z.infer<typeof merged>} MergedOutput */
/** @typedef {z.SafeParseReturnType<MergedInput, MergedOutput>} MergedSafeParseReturn */
let env = /** @type {MergedOutput} */ (process.env);
if (!!process.env.SKIP_ENV_VALIDATION == false) {
const isServer = typeof window === "undefined";
const parsed = /** @type {MergedSafeParseReturn} */ (
isServer
? merged.safeParse(processEnv) // on server we can validate all env vars
: client.safeParse(processEnv) // on client we can only validate the ones that are exposed
);
if (parsed.success === false) {
console.error(
"❌ Invalid environment variables:",
parsed.error.flatten().fieldErrors
);
throw new Error("Invalid environment variables");
}
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 && !prop.startsWith("NEXT_PUBLIC_"))
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`
);
return target[/** @type {keyof typeof target} */ (prop)];
},
});
}
export { env };