diff --git a/check-size/index.js b/check-size/index.js
new file mode 100644
index 0000000..13b18d8
--- /dev/null
+++ b/check-size/index.js
@@ -0,0 +1,67 @@
+/* eslint-disable @typescript-eslint/no-var-requires */
+const { readdir, stat } = require('fs').promises;
+const { join } = require('path');
+
+// For GitHub Actions:
+const core = require('@actions/core');
+
+// 🔎 Settings:
+const dir = '../static/library';
+const sizeLimit = 20000; // 20kb;
+
+function convertBytes(bytes, format = 'KB') {
+  if (format === 'KB') {
+    return (bytes / 1024).toFixed(2) + ' KB';
+  } else if (format === 'MB') {
+    return (bytes / (1024 * 1024)).toFixed(2) + ' MB';
+  } else {
+    return 'Invalid format. Use "KB" or "MB".';
+  }
+}
+
+async function checkSize() {
+  const files = await readdir(dir);
+  let maxSize = 0;
+  let maxFiles = [];
+  let message = '';
+
+  try {
+    for (const file of files) {
+      const filePath = join(dir, file);
+      const stats = await stat(filePath);
+
+      if (stats.size > maxSize) {
+        maxSize = stats.size;
+        maxFiles.push({
+          filename: file,
+          size: maxSize
+        });
+      }
+    }
+
+    if (maxFiles.length === 0) {
+      message = `- ✅ All files are smaller than ${convertBytes(sizeLimit)}`;
+      console.log(message);
+      core.setOutput('message', message);
+    } else {
+      message = `- ❌ There are files bigger than ${convertBytes(sizeLimit)}.`;
+      throw new Error(message);
+    }
+  } catch (err) {
+    core.setFailed(message);
+  } finally {
+    if (maxFiles.length > 0) {
+      console.log('🔎 Files found:');
+      maxFiles.forEach((file) => {
+        console.log(`- 📄 ${file.filename} - ${convertBytes(file.size, 'KB')}`);
+      });
+    }
+    console.log('⚙️ Settings:');
+    console.log(`- 📁 Directory: ${dir}`);
+    console.log(`- 🧱 Size limit: ${convertBytes(sizeLimit)} bytes`);
+    console.log(`- 🔔 Max size found: ${convertBytes(maxSize, 'MB')}`);
+  }
+}
+
+// Run the function
+checkSize();
diff --git a/check-size/index.mjs b/check-size/index.mjs
deleted file mode 100644
index 7e28bc0..0000000
--- a/check-size/index.mjs
+++ /dev/null
@@ -1,51 +0,0 @@
-import { readdir, stat } from 'fs/promises';
-import { join } from 'path';
-
-// 🔎 Settings:
-const dir = '../static/library';
-const sizeLimit = 20000; // 20kb;
-
-function convertBytes(bytes, format = 'KB') {
-  if (format === 'KB') {
-    return (bytes / 1024).toFixed(2) + ' KB';
-  } else if (format === 'MB') {
-    return (bytes / (1024 * 1024)).toFixed(2) + ' MB';
-  } else {
-    return 'Formato no válido. Utilice "KB" o "MB".';
-  }
-}
-
-export async function checkSize() {
-  const files = await readdir(dir);
-  let maxSize = 0;
-  let maxFiles = [];
-
-  try {
-    for (const file of files) {
-      const filePath = join(dir, file);
-      const stats = await stat(filePath);
-
-      if (stats.size > maxSize) {
-        maxSize = stats.size;
-        maxFiles.push(file);
-      }
-    }
-
-    if (maxFiles.length === 0) {
-      console.log(`- ✅ All files are smaller than ${convertBytes(sizeLimit)}`);
-    } else {
-      throw new Error(
-        `The following files are bigger than ${convertBytes(sizeLimit)}: ${maxFiles.join(', ')}`
-      );
-    }
-  } catch (err) {
-    console.error(`- ❌ ${err.message}`);
-  } finally {
-    console.log(`- 📁 Directory: ${dir}`);
-    console.log(`- 📏 Size limit: ${convertBytes(sizeLimit)} bytes`);
-    console.log(`- 📏 Max size found: ${convertBytes(maxSize, 'MB')}`);
-  }
-}
-
-// Run the function
-checkSize();