breaking: upgrade to TypeScript 5 (#11160)

Author: benmccann

.changeset/itchy-bags-lay.md

@@ -0,0 +1,5 @@
+---
+'@sveltejs/kit': major
+---
+
+breaking: upgrade to TypeScript 5 and default `moduleResolution` to `bundler` in user projects

.changeset/silent-mayflies-burn.md

@@ -31,7 +31,7 @@
 		"playwright": "1.30.0",
 		"prettier": "^3.1.0",
 		"svelte": "^4.2.7",
-		"typescript": "^4.9.4"
+		"typescript": "^5.3.2"
 	},
 	"packageManager": "[email protected]",
 	"engines": {

package.json

@@ -32,7 +32,7 @@
 	"devDependencies": {
 		"@sveltejs/kit": "workspace:^",
 		"@types/node": "^16.18.6",
-		"typescript": "^4.9.4"
+		"typescript": "^5.3.2"
 	},
 	"dependencies": {
 		"import-meta-resolve": "^4.0.0"

packages/adapter-auto/package.json

@@ -37,7 +37,7 @@
 	"devDependencies": {
 		"@cloudflare/kv-asset-handler": "^0.3.0",
 		"@types/node": "^16.18.6",
-		"typescript": "^4.9.4"
+		"typescript": "^5.3.2"
 	},
 	"peerDependencies": {
 		"@sveltejs/kit": "^1.0.0"

packages/adapter-cloudflare-workers/package.json

@@ -39,7 +39,7 @@
 	"devDependencies": {
 		"@types/node": "^16.18.6",
 		"@types/ws": "^8.5.3",
-		"typescript": "^4.9.4"
+		"typescript": "^5.3.2"
 	},
 	"peerDependencies": {
 		"@sveltejs/kit": "^1.0.0"

packages/adapter-cloudflare/package.json

@@ -38,15 +38,15 @@
 		"set-cookie-parser": "^2.6.0"
 	},
 	"devDependencies": {
-		"@netlify/functions": "^2.0.1",
+		"@netlify/functions": "^2.4.0",
 		"@rollup/plugin-commonjs": "^25.0.7",
 		"@rollup/plugin-json": "^6.0.1",
 		"@rollup/plugin-node-resolve": "^15.2.3",
 		"@sveltejs/kit": "workspace:^",
 		"@types/node": "^16.18.6",
 		"@types/set-cookie-parser": "^2.4.2",
 		"rollup": "^4.2.0",
-		"typescript": "^4.9.4",
+		"typescript": "^5.3.2",
 		"vitest": "^0.34.5"
 	},
 	"peerDependencies": {

packages/adapter-netlify/package.json

@@ -12,6 +12,7 @@ const config = {
 		dir: 'files/esm',
 		format: 'esm'
 	},
+	// @ts-ignore https://github.com/rollup/plugins/issues/1329
 	plugins: [nodeResolve({ preferBuiltins: true }), commonjs(), json()],
 	external: (id) => id === '0SERVER' || id.startsWith('node:'),
 	preserveEntrySignatures: 'exports-only'

packages/adapter-netlify/rollup.config.js

@@ -5,10 +5,10 @@
 		"noEmit": true,
 		"noImplicitAny": true,
 		"target": "es2022",
-		"module": "es2022",
-		// `@netlify/function` > `@netlify/serverless-functions-api` types are not compatible,
-		// so using this moduleResolution for now
-		"moduleResolution": "node",
+		"module": "node16",
+		"moduleResolution": "node16",
+		// https://github.com/netlify/functions/issues/447
+		"skipLibCheck": true,
 		"allowSyntheticDefaultImports": true,
 		"baseUrl": ".",
 		"paths": {

packages/adapter-netlify/tsconfig.json

@@ -62,7 +62,9 @@ export default function (opts = {}) {
 						preferBuiltins: true,
 						exportConditions: ['node']
 					}),
+					// @ts-ignore https://github.com/rollup/plugins/issues/1329
 					commonjs({ strictRequires: true }),
+					// @ts-ignore https://github.com/rollup/plugins/issues/1329
 					json()
 				]
 			});