chore: add test to ensure version.js and package.json are in sync

packages/svelte/.prettierignore

@@ -12,6 +12,7 @@ src/shared/version.js
 /test/**/_actual*
 /test/**/expected*
 /test/**/_output
+/test/**/shards/*.test.js
 /types
 !rollup.config.js
 !vitest.config.js

packages/svelte/scripts/generate-version.js

@@ -4,5 +4,5 @@ const pkg = JSON.parse(fs.readFileSync('package.json', 'utf-8'));
 
 fs.writeFileSync(
 	'./src/shared/version.js',
-	`/** @type {string} */\nexport const VERSION = '${pkg.version}';`
+	`// generated during release, do not modify\n\n/** @type {string} */\nexport const VERSION = '${pkg.version}';\n`
 );

packages/svelte/src/shared/version.js

@@ -1,2 +1,4 @@
+// generated during release, do not modify
+
 /** @type {string} */
-export const VERSION = '4.0.0-next.0';
+export const VERSION = '4.0.0-next.0';

packages/svelte/test/version/version.test.js

@@ -0,0 +1,16 @@
+import { fileURLToPath } from 'node:url';
+import { assert, describe, it } from 'vitest';
+import { VERSION } from 'svelte/compiler';
+import { try_load_json } from '../helpers.js';
+
+describe('svelte/compiler VERSION', () => {
+	it('should be the exact version from package.json');
+	const pkg = try_load_json(
+		fileURLToPath(new URL(`../../../../packages/svelte/package.json`, import.meta.url))
+	);
+	assert.equal(
+		VERSION,
+		pkg.version,
+		`VERSION export in src/shared/version.js does not equal version in package.json`
+	);
+});