SvelteKit Server-Only Modules: Keep Your Secrets Secret
SvelteKit's server-only modules are a firewall for your code, preventing sensitive data like API keys from ever being bundled for the browser. Use them for database clients or secret logic.
SvelteKit's server-only modules are a compile-time firewall, preventing sensitive backend code from accidentally leaking into your client-side bundle. Mark modules as server-only by placing them in `$lib/server/` or naming them with `.server.js`. This is essential for protecting database clients, private API keys, or filesystem access. The check is strict: if a client component imports a utility file that *also* imports from a server-only module, the build will fail, even if the sensitive part isn't directly used.
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