handler(_options) {
				if (vite_config.build.ssr) return;

				const guard = module_guard(this, {
					cwd: vite.normalizePath(process.cwd()),
					lib: vite.normalizePath(kit.files.lib)
				});

				manifest_data.nodes.forEach((_node, i) => {
					const id = vite.normalizePath(
						path.resolve(kit.outDir, `generated/client-optimized/nodes/${i}.js`)
					);

					guard.check(id);
				});
			}
Ensures that client-side code can't accidentally import server-side code,
whether in `*.server.js` files, `$app/server`, `$lib/server`, or `$env/[static|dynamic]/private`
@type {import('vite').Plugin}