diff --git a/packages/micropack/src/cli.mjs b/packages/micropack/src/cli.mjs
index 445c816..9a6c985 100755
--- a/packages/micropack/src/cli.mjs
+++ b/packages/micropack/src/cli.mjs
@@ -49,8 +49,9 @@ program
         'Files .css will be parsed as modules (default: null)',
         DEFAULT_OPTIONS.cssModule
     )
-    .option('--timestamp', 'Add timestamp to beging of file', false)
+    .option('--no-timestamp', 'Add timestamp to beging of file', true)
     .action(async (opts) => {
+        console.log(opts)
         try {
             await micropack(opts);
         } catch (e) {
@@ -69,7 +70,7 @@ program.on('--help', function () {
 
 export function run(argv) {
     setupExceptionHandler();
+    console.log(argv)
     program.parse(argv);
 }
-
 run(process.argv);
diff --git a/packages/micropack/src/utils/cmd.mjs b/packages/micropack/src/utils/cmd.mjs
index 5e162f1..928f381 100644
--- a/packages/micropack/src/utils/cmd.mjs
+++ b/packages/micropack/src/utils/cmd.mjs
@@ -8,5 +8,7 @@ export const collectDict = (vals, acc) => ({
             return acc;
         }, {}),
 });
-export const collectList = (vals, acc) => [...acc, ...vals.split(',')];
+export const collectList = (vals, acc=[]) => {
+    return [...acc, ...vals.split(',')];
+}
 export const increaseVerbose = (_, acc) => (acc += 1);
diff --git a/packages/micropack/test/__snapshots__/index.test.mjs.snap b/packages/micropack/test/__snapshots__/index.test.mjs.snap
index 378e6c7..41b789f 100644
--- a/packages/micropack/test/__snapshots__/index.test.mjs.snap
+++ b/packages/micropack/test/__snapshots__/index.test.mjs.snap
@@ -37,6 +37,7 @@ css-module
     index.mjs
   package.json
   src
+    declarations.d.ts
     index.ts
     main.css
     main.module.css
diff --git a/packages/micropack/test/fixtures/css-module/src/declarations.d.ts b/packages/micropack/test/fixtures/css-module/src/declarations.d.ts
new file mode 100644
index 0000000..35306c6
--- /dev/null
+++ b/packages/micropack/test/fixtures/css-module/src/declarations.d.ts
@@ -0,0 +1 @@
+declare module '*.css';
diff --git a/packages/micropack/test/index.test.mjs b/packages/micropack/test/index.test.mjs
index 708f6cf..31eeba9 100644
--- a/packages/micropack/test/index.test.mjs
+++ b/packages/micropack/test/index.test.mjs
@@ -8,7 +8,6 @@ import { buildFixture, printDirTree, findAllFiles } from './utils.mjs';
 
 chai.use(jestSnapshotPlugin());
 
-
 const __dirname = url.fileURLToPath(new URL('.', import.meta.url));
 
 const FIXTURES_DIR = `${__dirname}fixtures`;
@@ -41,6 +40,6 @@ describe('fixtures', () => {
             for(const [name, filePath] of files) {
                 expect(readFileSync(filePath, { encoding: 'utf8'})).toMatchSnapshot(`dist/${name}`);
             }
-        });
+        }).timeout(5000);
     });
 });
diff --git a/packages/micropack/test/setup.mjs b/packages/micropack/test/setup.mjs
deleted file mode 100644
index e69de29..0000000
diff --git a/packages/micropack/test/utils.mjs b/packages/micropack/test/utils.mjs
index 7026d73..c565904 100644
--- a/packages/micropack/test/utils.mjs
+++ b/packages/micropack/test/utils.mjs
@@ -1,10 +1,19 @@
+import {readFileSync} from 'fs';
+import Path from 'node:path';
+import Url from 'node:url';
 import {execaSync} from 'execa';
 import dirTree from 'directory-tree';
 
 
+const __dirname = Url.fileURLToPath(new URL('.', import.meta.url));
+const mainScript = Path.resolve(__dirname, '../src/cli.mjs');
+
 export function buildFixture(path) {
+    const build = JSON.parse(readFileSync(Path.join(path, 'package.json')))['scripts']['build'];
+    const buildParams = build.split(' ').slice(1);
+    const params = [mainScript, ...buildParams, '--no-timestamp'];
     try {
-        const result = execaSync('npm', ['run', 'build'], {cwd: path});
+        const result = execaSync('node', params, {cwd: path});
         if (result.stderr) {
             return result.stderr;
         }