Sync kit docs (#1116)

sync kit docs

Co-authored-by: svelte-docs-bot[bot] <196124396+svelte-docs-bot[bot]@users.noreply.github.com>

Author: github-actions[bot]

apps/svelte.dev/content/docs/kit/25-build-and-deploy/90-adapter-vercel.md

@@ -70,13 +70,12 @@ If your functions need to access data in a specific region, it's recommended tha
 You may set the `images` config to control how Vercel builds your images. See the [image configuration reference](https://vercel.com/docs/build-output-api/v3/configuration#images) for full details. As an example, you may set:
 
 ```js
-// @errors: 2300 2842 7031 1181 1005 1136 1128
 /// file: svelte.config.js
 import adapter from '@sveltejs/adapter-vercel';
 
 export default {
 	kit: {
-		adapter({
+		adapter: adapter({
 			images: {
 				sizes: [640, 828, 1200, 1920, 3840],
 				formats: ['image/avif', 'image/webp'],
@@ -125,16 +124,16 @@ Making a `GET` or `HEAD` request with `x-prerender-revalidate: <token>` will for
 
 Note that the `BYPASS_TOKEN` string must be at least 32 characters long. You could generate one using the JavaScript console like so:
 
-```console
-btoa(Math.random().toString()).substring(0,32);
+```js
+crypto.randomUUID();
 ```
 
 Set this string as an environment variable on Vercel by logging in and going to your project then Settings > Environment Variables. For "Key" put `BYPASS_TOKEN` and for "value" use the string generated above, then hit "Save".
 
 To get this key known about for local development, you can use the [Vercel CLI](https://vercel.com/docs/cli/env) by running the `vercel env pull` command locally like so:
 
-```console
-$ vercel env pull .env.development.local
+```sh
+vercel env pull .env.development.local
 ```
 
 ### allowQuery

apps/svelte.dev/content/docs/kit/30-advanced/20-hooks.md

@@ -68,6 +68,13 @@ export async function handle({ event, resolve }) {
 	event.locals.user = await getUserInformation(event.cookies.get('sessionid'));
 
 	const response = await resolve(event);
+
+	// Note that modifying response headers isn't always safe.
+	// Response objects can have immutable headers
+	// (e.g. Response.redirect() returned from an endpoint).
+	// Modifying immutable headers throws a TypeError.
+	// In that case, clone the response or avoid creating a
+	// response object with immutable headers.
 	response.headers.set('x-custom-header', 'potato');
 
 	return response;

apps/svelte.dev/content/docs/kit/30-advanced/70-packaging.md

@@ -219,6 +219,23 @@ You should think carefully about whether or not the changes you make to your pac
 }
 ```
 
+## Source maps
+
+You can create so-called declaration maps (`d.ts.map` files) by setting `"declarationMap": true` in your `tsconfig.json`. This will allow editors such as VS Code to go to the original `.ts` or `.svelte` file when using features like _Go to Definition_. This means you also need to publish your source files alongside your dist folder in a way that the relative path inside the declaration files leads to a file on disk. Assuming that you have all your library code inside `src/lib` as suggested by Svelte's CLI, this is as simple as adding `src/lib` to `files` in your `package.json`:
+
+```json
+{
+	"files": [
+		"dist",
+		"!dist/**/*.test.*",
+		"!dist/**/*.spec.*",
+		+++"src/lib",
+		"!src/lib/**/*.test.*",
+		"!src/lib/**/*.spec.*"+++
+	]
+}
+```
+
 ## Options
 
 `svelte-package` accepts the following options:

apps/svelte.dev/content/docs/kit/40-best-practices/03-auth.md

@@ -19,6 +19,6 @@ Auth [cookies](@sveltejs-kit#Cookies) can be checked inside [server hooks](hooks
 
 ## Guides
 
-[Lucia](https://lucia-auth.com/) is a reference for session-based web app auth. It contains example code snippets and projects for implementing session-based auth within SvelteKit and other JS projects. You can add code which follows the Lucia guide to your project with `npx sv create` when creating a new project or `npx sv add lucia` for an existing project.
+[Lucia](https://lucia-auth.com/) is a good reference for session-based web app auth. It contains example code snippets and projects for implementing session-based auth within SvelteKit and other JS projects. You can add code which follows the Lucia guide to your project with `npx sv create` when creating a new project or `npx sv add lucia` for an existing project.
 
 An auth system is tightly coupled to a web framework because most of the code lies in validating user input, handling errors, and directing users to the appropriate next page. As a result, many of the generic JS auth libraries include one or more web frameworks within them. For this reason, many users will find it preferrable to follow a SvelteKit-specific guide such as the examples found in [Lucia](https://lucia-auth.com/) rather than having multiple web frameworks inside their project.

apps/svelte.dev/content/docs/kit/98-reference/[email protected]

@@ -2351,6 +2351,14 @@ routes: SSRRoute[];
 </div>
 <div class="ts-block-property">
 
+```dts
+prerendered_routes: Set<string>;
+```
+
+<div class="ts-block-property-details"></div>
+</div>
+<div class="ts-block-property">
+
 ```dts
 matchers: () => Promise<Record<string, ParamMatcher>>;
 ```