[fix] add $types to includes for better DX (#7301)

* [fix] add $types to includes for better DX

$types.d.ts files not referenced in user code were not loaded on startup in the IDE, because the includes list did not contain references to them. This resulted in suboptimal DX.

* Update .changeset/spotty-kangaroos-peel.md

Co-authored-by: Rich Harris <[email protected]>

Author: dummdidumm

.changeset/spotty-kangaroos-peel.md

@@ -0,0 +1,5 @@
+---
+'@sveltejs/kit': patch
+---
+
+[fix] add `$types` to includes for better DX

packages/kit/src/core/sync/write_tsconfig.js

@@ -46,7 +46,7 @@ export function write_tsconfig(config, cwd = process.cwd()) {
 	/** @param {string} file */
 	const config_relative = (file) => posixify(path.relative(config.outDir, file));
 
-	const include = ['ambient.d.ts', config_relative('vite.config.ts')];
+	const include = ['ambient.d.ts', './types/**/$types.d.ts', config_relative('vite.config.ts')];
 	for (const dir of [config.files.routes, config.files.lib]) {
 		const relative = project_relative(path.dirname(dir));
 		include.push(config_relative(`${relative}/**/*.js`));