fix: use namespace import for vite to support upcoming vite 3.0 esm

.changeset/short-guests-sort.md

@@ -0,0 +1,5 @@
+---
+'@sveltejs/kit': patch
+---
+
+use namespace import for vite to support upcoming vite 3.0 esm

packages/kit/src/core/build/build_service_worker.js

@@ -1,5 +1,5 @@
 import fs from 'fs';
-import vite from 'vite';
+import * as vite from 'vite';
 import { s } from '../../utils/misc.js';
 import { deep_merge } from '../../utils/object.js';
 import { normalize_path } from '../../utils/url.js';

packages/kit/src/core/build/utils.js

@@ -1,4 +1,4 @@
-import vite from 'vite';
+import * as vite from 'vite';
 
 /**
  * @typedef {import('rollup').RollupOutput} RollupOutput

packages/kit/src/core/dev/index.js

@@ -1,6 +1,6 @@
 import path from 'path';
 import { svelte } from '@sveltejs/vite-plugin-svelte';
-import vite from 'vite';
+import * as vite from 'vite';
 import { deep_merge } from '../../utils/object.js';
 import { print_config_conflicts } from '../config/index.js';
 import { get_aliases, get_runtime_path } from '../utils.js';