diff --git a/lib/debug.js b/lib/debug.js
index a208e72ea..b6e1f9655 100644
--- a/lib/debug.js
+++ b/lib/debug.js
@@ -1,4 +1,4 @@
-const fork           = require('child_process').fork;
+const fork           = require('node:child_process').fork;
 
 const adapter = {
     log: {
@@ -151,4 +151,4 @@ function debugScript(data) {
         });
 }
 
-debugScript({ scriptName: 'script.js.Skript_1' });
\ No newline at end of file
+debugScript({ scriptName: 'script.js.Skript_1' });
diff --git a/lib/debugger.js b/lib/debugger.js
index b08ab05e1..8b577c669 100644
--- a/lib/debugger.js
+++ b/lib/debugger.js
@@ -20,12 +20,12 @@
  * IN THE SOFTWARE.
  */
 'use strict';
-//const FS = require('fs');
-const Path = require('path');
+// const FS = require('fs');
+const Path = require('node:path');
 const Repl = require('repl');
-const util = require('util');
+const util = require('node:util');
 const vm = require('vm');
-const fileURLToPath = require('url').fileURLToPath;
+const fileURLToPath = require('node:url').fileURLToPath;
 
 const debuglog = util.debuglog('inspect');
 
diff --git a/lib/inspect.js b/lib/inspect.js
index 883e4bdb2..ea40f65c0 100644
--- a/lib/inspect.js
+++ b/lib/inspect.js
@@ -20,12 +20,12 @@
  * IN THE SOFTWARE.
  */
 'use strict';
-const { spawn } = require('child_process');
-const { EventEmitter } = require('events');
-const net = require('net');
-const util = require('util');
-const path = require('path');
-const fs = require('fs');
+const { spawn } = require('node:child_process');
+const { EventEmitter } = require('node:events');
+const net = require('node:net');
+const util = require('node:util');
+const path = require('node:path');
+const fs = require('node:fs');
 
 let breakOnStart;
 for (let i = 0; i < process.argv.length; i++) {
diff --git a/lib/mirror.js b/lib/mirror.js
index 64d411d20..6ee42ea1c 100644
--- a/lib/mirror.js
+++ b/lib/mirror.js
@@ -1,6 +1,6 @@
 'use strict';
-const fs = require('fs');
-const path = require('path');
+const fs = require('node:fs');
+const path = require('node:path');
 
 const MODE_0777 = 511;
 
@@ -25,12 +25,12 @@ class Mirror {
         this.lastSyncID = `${this.from}.lastSync`;
 
         this.log = options.log || {
-            silly: text  => console.log(text),
-            debug: text  => console.log(text),
-            info:  text  => console.log(text),
-            log:   text  => console.log(text),
-            warn:  text  => console.warn(text),
-            error: text  => console.error(text)
+            silly: text => console.log(text),
+            debug: text => console.log(text),
+            info:  text => console.log(text),
+            log:   text => console.log(text),
+            warn:  text => console.warn(text),
+            error: text => console.error(text),
         };
 
         if (!fs.existsSync(this.diskRoot)) {
@@ -99,7 +99,7 @@ class Mirror {
                 this.log.error(`Please check that no other processes change data in the mirror directory!`);
             }
 
-            this.watchedFolder[root_].on('error', err => {
+            this.watchedFolder[root_].on('error', () => {
                 this.log.debug(`Folder ${root_} was deleted`);
                 try {
                     this.watchedFolder[root_] && this.watchedFolder[root_].close();
@@ -115,7 +115,7 @@ class Mirror {
     }
 
     checkLastSyncObject(cb) {
-        this.adapter.getForeignObject(this.lastSyncID, (err, obj) => {
+        this.adapter.getForeignObject(this.lastSyncID, (_err, obj) => {
             if (!obj) {
                 // create variable
                 const obj = {
@@ -128,13 +128,13 @@ class Mirror {
                         min: 0,
                         read: true,
                     },
-                    type: 'state'
+                    type: 'state',
                 };
 
                 this.adapter.setForeignObject(this.lastSyncID, obj, () =>
                     this.adapter.setForeignState(this.lastSyncID, 0, true, () => cb && cb(0)));
             } else {
-                this.adapter.getForeignState(this.lastSyncID, (err, state) =>
+                this.adapter.getForeignState(this.lastSyncID, (_err, state) =>
                     cb && cb(state && state.val));
             }
         });
@@ -219,7 +219,7 @@ class Mirror {
         const diskListEntry = this.diskList[id];
         try {
             //check if the directory exists and create if not:
-            fs.mkdirSync(path.dirname(diskListEntry.name), {recursive: true, mode: MODE_0777});
+            fs.mkdirSync(path.dirname(diskListEntry.name), { recursive: true, mode: MODE_0777 });
             fs.writeFileSync(diskListEntry.name, diskListEntry.source, {mode: MODE_0777});
             diskListEntry.ts = Date.now();
             return true;
@@ -588,8 +588,8 @@ class Mirror {
     }
 
     scanDB(cb) {
-        this.adapter.getObjectView('system', 'channel', {startkey: 'script.js.', endkey: 'script.js.\u9999'}, (err, res) => {
-            // this is not required, because javascript subscribes on ALL objects
+        this.adapter.getObjectView('system', 'channel', { startkey: 'script.js.', endkey: 'script.js.\u9999' }, (err, res) => {
+            // this is not required, because JavaScript subscribes on ALL objects
             // adapter.subscribeForeignObjects('script.js.*');
             const list = {};
             if (err) {
@@ -603,7 +603,7 @@ class Mirror {
                     }
                 }
             }
-            this.adapter.getObjectView('script', 'javascript', {startkey: 'script.js.', endkey: 'script.js.\u9999'}, (err, res) => {
+            this.adapter.getObjectView('script', 'javascript', { startkey: 'script.js.', endkey: 'script.js.\u9999' }, (err, res) => {
                 if (err) {
                     this.log.error(`Error while checking scripts javascript from objects database: ${err}`);
                 }
@@ -612,12 +612,14 @@ class Mirror {
                         const value = res.rows[i].value;
                         if (value && value._id && value.common) {
                             list[res.rows[i].value._id] = res.rows[i].value;
-                            // ensure that every script has a folder and if not then create it
+                            // ensure that every script has a folder and if not, then create it
                             this._checkIfAllFoldersAreExist(res.rows[i].value._id, list);
                         }
                     }
                 }
-                cb && cb(list);
+                if (cb) {
+                    cb(list);
+                }
             });
         });
     }
diff --git a/package.json b/package.json
index 97e2fd789..560387358 100644
--- a/package.json
+++ b/package.json
@@ -62,6 +62,7 @@
     "@alcalzone/release-script-plugin-iobroker": "^3.7.2",
     "@alcalzone/release-script-plugin-license": "^3.7.0",
     "@iobroker/adapter-dev": "^1.3.0",
+    "@iobroker/testing": "^4.1.3",
     "@iobroker/types": "^6.0.11",
     "@iobroker/vis-2-widgets-react-dev": "^3.0.7",
     "alcalzone-shared": "^4.0.8",