React · Senior · Question 64 of 75

How do you guarantee a module with secrets is never bundled into client code?

import "server-only";
export async function getSecretData() { /* uses API keys */ }

✓Correct answer: Import the server-only package, which makes the build fail if a client module imports this file
2Name the file *.server.js
3Use 'use server' at the top of the file

Explanation

'use server' marks Server Functions callable from the client - it does not hide a module. server-only is a build-time guard against accidental imports.

How do you guarantee a module with secrets is never bundled into client code?

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