fix: pin TypeScript to ~5.3.3 to fix language-tools tests

tests/language-tools.ts

@@ -9,5 +9,19 @@ export async function test(options: RunOptions) {
 		beforeBuild: 'pnpm dedupe',
 		build: 'build',
 		test: 'test',
+		patchFiles: {
+			'package.json': (content) => {
+				const pkg = JSON.parse(content)
+				// As of 2024-03-19,
+				// the version of TypeScript in the package.json is latest, which resolves to 5.4.2 if we dedupe it.
+				// The new feature in TypeScript 5.4,
+				// [Preserved Narrowing in Closures Following Last Assignments](https://devblogs.microsoft.com/typescript/announcing-typescript-5-4/#preserved-narrowing-in-closures-following-last-assignments),
+				// would cause a type error at <https://github.com/vuejs/language-tools/blob/58a820281d4b4a8b2d484a7fa2a2eb73e5eb4daf/packages/language-service/lib/plugins/vue-document-drop.ts#L88>.
+				// There are also other tests broken by TypeScript 5.4.
+				// So we need to pin the version to ~5.3.3.
+				pkg.devDependencies.typescript = '~5.3.3'
+				return JSON.stringify(pkg, null, 2)
+			},
+		},
 	})
 }