diff --git a/.github/workflows/docs-preview-create.yml b/.github/workflows/docs-preview-create.yml
index 4f6f5a283..7b1074558 100644
--- a/.github/workflows/docs-preview-create.yml
+++ b/.github/workflows/docs-preview-create.yml
@@ -47,7 +47,7 @@ jobs:
       - uses: pnpm/action-setup@v4
       - uses: actions/setup-node@v4
         with:
-          node-version: 22
+          node-version: 24
           cache: pnpm
       - run: pnpm install --frozen-lockfile
 
diff --git a/.github/workflows/sync-docs.yml b/.github/workflows/sync-docs.yml
index 79b5a9727..01f683a62 100644
--- a/.github/workflows/sync-docs.yml
+++ b/.github/workflows/sync-docs.yml
@@ -20,7 +20,7 @@ jobs:
       - uses: pnpm/action-setup@v4
       - uses: actions/setup-node@v4
         with:
-          node-version: 22
+          node-version: 24
           cache: pnpm
       - run: pnpm install --frozen-lockfile
 
diff --git a/apps/svelte.dev/package.json b/apps/svelte.dev/package.json
index c64e02ec2..04e9eca6a 100644
--- a/apps/svelte.dev/package.json
+++ b/apps/svelte.dev/package.json
@@ -13,7 +13,7 @@
 		"check": "node scripts/update.js && svelte-kit sync && svelte-check",
 		"format": "prettier --write .",
 		"lint": "prettier --check .",
-		"sync-docs": "tsx scripts/sync-docs/index.ts",
+		"sync-docs": "node scripts/sync-docs/index.ts",
 		"sync-packages": "node scripts/sync-packages/index.ts"
 	},
 	"dependencies": {
@@ -79,7 +79,6 @@
 		"svelte-check": "^4.3.1",
 		"svelte-preprocess": "^6.0.3",
 		"tiny-glob": "^0.2.9",
-		"tsx": "^4.19.0",
 		"typescript": "^5.5.4",
 		"valibot": "^1.1.0",
 		"vite": "^7.0.4",
diff --git a/apps/svelte.dev/scripts/sync-docs/index.ts b/apps/svelte.dev/scripts/sync-docs/index.ts
index 91d024f64..b271dc21a 100644
--- a/apps/svelte.dev/scripts/sync-docs/index.ts
+++ b/apps/svelte.dev/scripts/sync-docs/index.ts
@@ -3,6 +3,7 @@ import { preprocess } from '@sveltejs/site-kit/markdown/preprocess';
 import path from 'node:path';
 import fs from 'node:fs';
 import { parseArgs } from 'node:util';
+import process from 'node:process';
 import ts from 'typescript';
 import glob from 'tiny-glob/sync.js';
 import chokidar from 'chokidar';
diff --git a/apps/svelte.dev/tsconfig.json b/apps/svelte.dev/tsconfig.json
index fc93cbd94..c58b41a43 100644
--- a/apps/svelte.dev/tsconfig.json
+++ b/apps/svelte.dev/tsconfig.json
@@ -9,7 +9,8 @@
 		"skipLibCheck": true,
 		"sourceMap": true,
 		"strict": true,
-		"moduleResolution": "bundler"
+		"moduleResolution": "bundler",
+		"rewriteRelativeImportExtensions": true
 	}
 	// Path aliases are handled by https://kit.svelte.dev/docs/configuration#alias
 	// except $lib which is handled by https://kit.svelte.dev/docs/configuration#files
diff --git a/packages/site-kit/src/lib/markdown/index.ts b/packages/site-kit/src/lib/markdown/index.ts
index eca67cde7..a523e1d60 100644
--- a/packages/site-kit/src/lib/markdown/index.ts
+++ b/packages/site-kit/src/lib/markdown/index.ts
@@ -1,6 +1,6 @@
-export { render_content_markdown } from './renderer';
+export { render_content_markdown } from './renderer.ts';
 
-export { transform, slugify, clean, strip_origin } from './utils';
+export { transform, slugify, clean, strip_origin } from './utils.ts';
 
 // TODO none of these really belong here
 export type Modules = Array<{
diff --git a/packages/site-kit/src/lib/markdown/preprocess.ts b/packages/site-kit/src/lib/markdown/preprocess.ts
index 4d9eded6c..740c1dd8b 100644
--- a/packages/site-kit/src/lib/markdown/preprocess.ts
+++ b/packages/site-kit/src/lib/markdown/preprocess.ts
@@ -1,7 +1,7 @@
 import fs from 'node:fs';
 import path from 'node:path';
-import { SHIKI_LANGUAGE_MAP, strip_origin } from './utils';
-import type { Declaration, TypeElement, Modules } from './index';
+import { SHIKI_LANGUAGE_MAP, strip_origin } from './utils.ts';
+import type { Declaration, TypeElement, Modules } from './index.ts';
 
 /**
  * Replace module/export placeholders during `sync-docs`
diff --git a/packages/site-kit/src/lib/markdown/renderer.ts b/packages/site-kit/src/lib/markdown/renderer.ts
index aaafcdfbe..e8e678fc5 100644
--- a/packages/site-kit/src/lib/markdown/renderer.ts
+++ b/packages/site-kit/src/lib/markdown/renderer.ts
@@ -9,7 +9,7 @@ import { createHighlighterCore } from 'shiki/core';
 import { createOnigurumaEngine } from 'shiki/engine/oniguruma';
 import { createCssVariablesTheme } from 'shiki';
 import { transformerTwoslash } from '@shikijs/twoslash';
-import { SHIKI_LANGUAGE_MAP, slugify, smart_quotes, transform } from './utils';
+import { SHIKI_LANGUAGE_MAP, slugify, smart_quotes, transform } from './utils.ts';
 
 interface SnippetOptions {
 	file: string | null;
diff --git a/packages/site-kit/tsconfig.json b/packages/site-kit/tsconfig.json
index 2c3ab4f38..36b910f51 100644
--- a/packages/site-kit/tsconfig.json
+++ b/packages/site-kit/tsconfig.json
@@ -11,7 +11,8 @@
 		"moduleResolution": "bundler",
 		"module": "esnext",
 		"target": "esnext",
-		"skipLibCheck": true // TODO remove once vite-plugin-svelte exposes PluginOptions
+		"skipLibCheck": true, // TODO remove once vite-plugin-svelte exposes PluginOptions
+		"rewriteRelativeImportExtensions": true
 	},
 	"include": ["./src/**/*.js", "./src/**/*.ts", "./src/**/*.svelte"]
 }
diff --git a/pnpm-lock.yaml b/pnpm-lock.yaml
index a263045fa..8a4f24e6e 100644
--- a/pnpm-lock.yaml
+++ b/pnpm-lock.yaml
@@ -195,9 +195,6 @@ importers:
       tiny-glob:
         specifier: ^0.2.9
         version: 0.2.9
-      tsx:
-        specifier: ^4.19.0
-        version: 4.20.4
       typescript:
         specifier: ^5.5.4
         version: 5.8.2
@@ -4713,6 +4710,7 @@ snapshots:
   get-tsconfig@4.10.1:
     dependencies:
       resolve-pkg-maps: 1.0.0
+    optional: true
 
   gifwrap@0.10.1:
     dependencies:
@@ -5231,7 +5229,8 @@ snapshots:
 
   resolve-from@5.0.0: {}
 
-  resolve-pkg-maps@1.0.0: {}
+  resolve-pkg-maps@1.0.0:
+    optional: true
 
   resolve.exports@2.0.2: {}
 
@@ -5549,6 +5548,7 @@ snapshots:
       get-tsconfig: 4.10.1
     optionalDependencies:
       fsevents: 2.3.3
+    optional: true
 
   twoslash-protocol@0.3.1: {}