use es2022 instead of es2020 - closes #8980 (#9293)

Author: Rich-Harris

.changeset/popular-jeans-wait.md

@@ -0,0 +1,6 @@
+---
+'@sveltejs/adapter-cloudflare': minor
+'@sveltejs/adapter-cloudflare-workers': minor
+---
+
+feat: use `es2022` target

packages/adapter-cloudflare-workers/index.js

@@ -58,7 +58,7 @@ export default function ({ config = 'wrangler.toml' } = {}) {
 				platform: 'browser',
 				conditions: ['worker', 'browser'],
 				sourcemap: 'linked',
-				target: 'es2020',
+				target: 'es2022',
 				entryPoints: [`${tmp}/entry.js`],
 				outfile: main,
 				bundle: true,

packages/adapter-cloudflare/index.js

@@ -49,7 +49,7 @@ export default function (options = {}) {
 				platform: 'browser',
 				conditions: ['worker', 'browser'],
 				sourcemap: 'linked',
-				target: 'es2020',
+				target: 'es2022',
 				entryPoints: [`${tmp}/_worker.js`],
 				outfile: `${dest}/_worker.js`,
 				allowOverwrite: true,