perf: shorten file names (#13003)

entry file names and asset names are untouched. chunk file names are often misleading because they may contain more (or less) than what the filename suggests.

Author: benmccann

.changeset/blue-foxes-clean.md

@@ -0,0 +1,5 @@
+---
+'@sveltejs/kit': patch
+---
+
+perf: shorten chunk file names

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

@@ -659,7 +659,7 @@ async function kit({ svelte_config }) {
 								format: inline ? 'iife' : 'esm',
 								name: `__sveltekit_${version_hash}.app`,
 								entryFileNames: ssr ? '[name].js' : `${prefix}/[name].[hash].${ext}`,
-								chunkFileNames: ssr ? 'chunks/[name].js' : `${prefix}/chunks/[name].[hash].${ext}`,
+								chunkFileNames: ssr ? 'chunks/[name].js' : `${prefix}/chunks/[hash].${ext}`,
 								assetFileNames: `${prefix}/assets/[name].[hash][extname]`,
 								hoistTransitiveImports: false,
 								sourcemapIgnoreList,
@@ -676,7 +676,7 @@ async function kit({ svelte_config }) {
 						rollupOptions: {
 							output: {
 								entryFileNames: `${prefix}/workers/[name]-[hash].js`,
-								chunkFileNames: `${prefix}/workers/chunks/[name]-[hash].js`,
+								chunkFileNames: `${prefix}/workers/chunks/[hash].js`,
 								assetFileNames: `${prefix}/workers/assets/[name]-[hash][extname]`,
 								hoistTransitiveImports: false
 							}