[fix] bump required Vite version and address warning (#7491)

fixes #7485

Author: benmccann

.changeset/grumpy-eyes-destroy.md

@@ -0,0 +1,5 @@
+---
+'@sveltejs/kit': patch
+---
+
+[fix] bump required Vite version and address warning

packages/kit/package.json

@@ -41,7 +41,7 @@
 	},
 	"peerDependencies": {
 		"svelte": "^3.44.0",
-		"vite": "^3.1.0"
+		"vite": "^3.2.0"
 	},
 	"bin": {
 		"svelte-kit": "svelte-kit.js"

packages/kit/src/exports/vite/build/utils.js

@@ -115,8 +115,10 @@ export function get_default_build_config({ config, input, ssr, outDir }) {
 			cssCodeSplit: true,
 			// don't use the default name to avoid collisions with 'static/manifest.json'
 			manifest: 'vite-manifest.json',
+			modulePreload: {
+				polyfill: false
+			},
 			outDir,
-			polyfillModulePreload: false,
 			rollupOptions: {
 				input,
 				output: {

packages/kit/src/exports/vite/index.js

@@ -34,8 +34,10 @@ const enforced_config = {
 			formats: true
 		},
 		manifest: true,
+		modulePreload: {
+			polyfill: true
+		},
 		outDir: true,
-		polyfillModulePreload: true,
 		rollupOptions: {
 			input: true,
 			output: {