Update index.md - Added specific configuration example for Svelte/Kit (…

…#1429)

Co-authored-by: pilcrow <[email protected]>

docs/pages/getting-started/sveltekit.md

@@ -6,12 +6,21 @@ title: "Getting started in Sveltekit"
 
 ## Installation
 
-Install Lucia using your package manager of your choice. While not strictly necessary, we recommend installing [Oslo](https://oslo.js.org), which Lucia is built on, for various auth utilities (which a lot of the guides use).
+Install Lucia using your package manager of your choice.
 
 ```
-npm install lucia oslo
+npm install -D lucia
 ```
 
+While not strictly necessary, we recommend installing [Oslo](https://oslo.js.org), which Lucia is built on, for various auth utilities (which a lot of the guides use).
+
+If you use `@sveltejs/adapter-node`, make sure to install `oslo` as a `dependency`, not as `devDependency` to prevent Rollup from bundling `oslo`. See the [SvelteKit documentation](https://kit.svelte.dev/docs/adapter-node#deploying) for details.
+
+```
+npm install oslo
+```
+
+
 ## Initialize Lucia
 
 Import `Lucia` and initialize it with your adapter. Refer to the [Database](/database) page to learn how to set up your database and initialize the adapter. Make sure to configure the `sessionCookie` option and register your `Lucia` instance type

docs/pages/upgrade-v3/index.md

@@ -209,3 +209,15 @@ const nextConfig = {
 	}
 };
 ```
+
+### SvelteKit
+
+#### @sveltejs/adapter-node
+
+Make sure to install `oslo` as a `dependency`, not as `devDependency` to prevent `@sveltejs/adapter-node` from bundling `oslo`.
+
+As per SvelteKit documentation :
+
+>Development dependencies will be bundled into your app using Rollup. To control whether a given package is bundled or externalised, place it in devDependencies or dependencies respectively in your package.json.
+
+See [SvelteKit documentation](https://kit.svelte.dev/docs/adapter-node#deploying) for details.