fix: only generate typing files with sync command (#8552)

* fix: only generate typing files with sync command

fixes #8525

* Apply suggestions from code review

Co-authored-by: Ben McCann <322311+benmccann@users.noreply.github.com>

* docs

Co-authored-by: Ben McCann <322311+benmccann@users.noreply.github.com>

.changeset/neat-geckos-end.md

@@ -0,0 +1,5 @@
+---
+'@sveltejs/kit': patch
+---
+
+fix: only generate type definitions with `sync` command

documentation/docs/50-reference/20-cli.md

@@ -12,4 +12,4 @@ However SvelteKit includes its own CLI for initialising your project:
 
 ## svelte-kit sync
 
-`svelte-kit sync` creates the generated files for your project such as types and a `tsconfig.json`. When you create a new project, it is listed as the `prepare` script and will be run automatically as part of the npm lifecycle, so you should not ordinarily have to run this command.
+`svelte-kit sync` creates the `tsconfig.json` and all generated types (which you can import as `./$types` inside routing files) for your project. When you create a new project, it is listed as the `prepare` script and will be run automatically as part of the npm lifecycle, so you should not ordinarily have to run this command.

packages/kit/src/cli.js

@@ -24,7 +24,7 @@ const prog = sade('svelte-kit').version(pkg.version);
 
 prog
 	.command('sync')
-	.describe('Synchronise generated files')
+	.describe('Synchronise generated type definitions')
 	.option('--mode', 'Specify a mode for loading environment variables', 'development')
 	.action(async ({ mode }) => {
 		if (!fs.existsSync('svelte.config.js')) {
@@ -35,7 +35,7 @@ prog
 		try {
 			const config = await load_config();
 			const sync = await import('./core/sync/sync.js');
-			await sync.all(config, mode);
+			await sync.all_types(config, mode);
 		} catch (error) {
 			handle_error(error);
 		}

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

@@ -51,7 +51,7 @@ export async function update(config, manifest_data, file) {
 }
 
 /**
- * Run sync.init and sync.update in series, returning the result from sync.update.
+ * Run sync.init and sync.create in series, returning the result from sync.create.
  * @param {import('types').ValidatedConfig} config
  * @param {string} mode The Vite mode
  */
@@ -60,6 +60,17 @@ export async function all(config, mode) {
 	return await create(config);
 }
 
+/**
+ * Run sync.init and then generate all type files.
+ * @param {import('types').ValidatedConfig} config
+ * @param {string} mode The Vite mode
+ */
+export async function all_types(config, mode) {
+	init(config, mode);
+	const manifest_data = create_manifest_data({ config });
+	await write_all_types(config, manifest_data);
+}
+
 /**
  * Regenerate server-internal.js in response to src/{app.html,error.html,service-worker.js} changing
  * @param {import('types').ValidatedConfig} config