diff --git a/package-lock.json b/package-lock.json
index 8d80667f..e2abe904 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -63,7 +63,7 @@
         "text-encoding": "^0.7.0",
         "ts-jest": "^28.0.4",
         "ts-loader": "^9.3.0",
-        "typescript": "^4.6.4",
+        "typescript": "^4.7.4",
         "webpack": "^5.72.0",
         "webpack-bundle-analyzer": "^4.5.0",
         "webpack-cli": "^4.9.2",
@@ -17670,9 +17670,9 @@
       }
     },
     "node_modules/typescript": {
-      "version": "4.6.4",
-      "resolved": "https://registry.npmjs.org/typescript/-/typescript-4.6.4.tgz",
-      "integrity": "sha512-9ia/jWHIEbo49HfjrLGfKbZSuWo9iTMwXO+Ca3pRsSpbsMbc7/IU8NKdCZVRRBafVPGnoJeFL76ZOAA84I9fEg==",
+      "version": "4.7.4",
+      "resolved": "https://registry.npmjs.org/typescript/-/typescript-4.7.4.tgz",
+      "integrity": "sha512-C0WQT0gezHuw6AdY1M2jxUO83Rjf0HP7Sk1DtXj6j1EwkQNZrHAg2XPWlq62oqEhYvONq5pkC2Y9oPljWToLmQ==",
       "dev": true,
       "bin": {
         "tsc": "bin/tsc",
@@ -31775,9 +31775,9 @@
       }
     },
     "typescript": {
-      "version": "4.6.4",
-      "resolved": "https://registry.npmjs.org/typescript/-/typescript-4.6.4.tgz",
-      "integrity": "sha512-9ia/jWHIEbo49HfjrLGfKbZSuWo9iTMwXO+Ca3pRsSpbsMbc7/IU8NKdCZVRRBafVPGnoJeFL76ZOAA84I9fEg==",
+      "version": "4.7.4",
+      "resolved": "https://registry.npmjs.org/typescript/-/typescript-4.7.4.tgz",
+      "integrity": "sha512-C0WQT0gezHuw6AdY1M2jxUO83Rjf0HP7Sk1DtXj6j1EwkQNZrHAg2XPWlq62oqEhYvONq5pkC2Y9oPljWToLmQ==",
       "dev": true
     },
     "uglify-js": {
diff --git a/package.json b/package.json
index 9fb3196b..a7549b4a 100644
--- a/package.json
+++ b/package.json
@@ -76,7 +76,7 @@
     "text-encoding": "^0.7.0",
     "ts-jest": "^28.0.4",
     "ts-loader": "^9.3.0",
-    "typescript": "^4.6.4",
+    "typescript": "^4.7.4",
     "webpack": "^5.72.0",
     "webpack-bundle-analyzer": "^4.5.0",
     "webpack-cli": "^4.9.2",
diff --git a/src/global.d.ts b/src/global.d.ts
index 817ce4f1..70a2a119 100644
--- a/src/global.d.ts
+++ b/src/global.d.ts
@@ -38,7 +38,7 @@ declare global {
   type FiltersError = 'PINNED_DIALOGS_TOO_MUCH';
 
   type LocalFileError = ApiFileManagerError | ReferenceError | StorageError;
-  type LocalErrorType = LocalFileError | NetworkerError | FiltersError | 'UNKNOWN' | 'NO_DOC' | 'MIDDLEWARE';
+  type LocalErrorType = LocalFileError | NetworkerError | FiltersError | 'UNKNOWN' | 'NO_DOC' | 'MIDDLEWARE' | 'PORT_DISCONNECTED';
 
   type ServerErrorType = 'FILE_REFERENCE_EXPIRED' | 'SESSION_REVOKED' | 'AUTH_KEY_DUPLICATED' |
     'SESSION_PASSWORD_NEEDED' | 'CONNECTION_NOT_INITED' | 'ERROR_EMPTY' | 'MTPROTO_CLUSTER_INVALID' |
diff --git a/src/lib/mtproto/mtprotoworker.ts b/src/lib/mtproto/mtprotoworker.ts
index a7430df2..f3ba26af 100644
--- a/src/lib/mtproto/mtprotoworker.ts
+++ b/src/lib/mtproto/mtprotoworker.ts
@@ -223,7 +223,7 @@ class ApiManagerProxy extends MTProtoMessagePort {
     };
     iframe.addEventListener('load', onLoad);
     iframe.addEventListener('error', onLoad);
-    iframe.src = 'ping/' + (Math.random() * 0xFFFFFFFF);
+    iframe.src = 'ping/' + (Math.random() * 0xFFFFFFFF | 0);
     document.body.append(iframe);
 
     const timeout = window.setTimeout(onLoad, 1e3);
diff --git a/src/lib/mtproto/superMessagePort.ts b/src/lib/mtproto/superMessagePort.ts
index db9af8cc..3fa1c605 100644
--- a/src/lib/mtproto/superMessagePort.ts
+++ b/src/lib/mtproto/superMessagePort.ts
@@ -9,6 +9,7 @@ import ctx from '../../environment/ctx';
 import indexOfAndSplice from '../../helpers/array/indexOfAndSplice';
 import {IS_WORKER} from '../../helpers/context';
 import EventListenerBase from '../../helpers/eventListenerBase';
+import makeError from '../../helpers/makeError';
 import {Awaited, WorkerTaskTemplate, WorkerTaskVoidTemplate} from '../../types';
 import {logger} from '../logger';
 
@@ -61,7 +62,12 @@ interface CloseTask extends SuperMessagePortTask {
 //   type: 'open'
 // }
 
-type Task = InvokeTask | ResultTask | AckTask | PingTask | PongTask | BatchTask | CloseTask/*  | OpenTask */;
+interface LockTask extends SuperMessagePortTask {
+  type: 'lock',
+  payload: string
+}
+
+type Task = InvokeTask | ResultTask | AckTask | PingTask | PongTask | BatchTask | CloseTask/*  | OpenTask */ | LockTask;
 type TaskMap = {
   [type in Task as type['type']]?: (task: Extract<Task, type>, source: MessageEventSource, event: MessageEvent<any>) => void | Promise<any>
 };
@@ -133,7 +139,11 @@ export default class SuperMessagePort<
     this.log = logger('MP' + (logSuffix ? '-' + logSuffix : ''));
     this.debug = DEBUG;
 
-    if(typeof(window) !== 'undefined') {
+    if('locks' in navigator) {
+      const id = 'lock-' + Date.now() + (Math.random() * 0xFFFF | 0);
+      navigator.locks.request(id, () => new Promise(() => {}));
+      this.pushTask(this.createTask('lock', id));
+    } else if(typeof(window) !== 'undefined') {
       window.addEventListener('beforeunload', () => {
         const task = this.createTask('close', undefined);
         this.postMessage(undefined, task);
@@ -146,8 +156,9 @@ export default class SuperMessagePort<
       invoke: this.processInvokeTask,
       ping: this.processPingTask,
       pong: this.processPongTask,
-      close: this.processCloseTask
-      // open: this.processOpenTask
+      close: this.processCloseTask,
+      // open: this.processOpenTask,
+      lock: this.processLockTask
     };
   }
 
@@ -231,7 +242,7 @@ export default class SuperMessagePort<
 
     this.onPortDisconnect?.(port as any);
 
-    const error = new Error('PORT_DISCONNECTED');
+    const error = makeError('PORT_DISCONNECTED');
     for(const id in this.awaiting) {
       const task = this.awaiting[id];
       if(task.port === port) {
@@ -406,6 +417,12 @@ export default class SuperMessagePort<
   //   this.onPortConnect?.(source);
   // };
 
+  protected processLockTask = (task: LockTask, source: MessageEventSource, event: MessageEvent) => {
+    navigator.locks.request(task.payload, () => {
+      this.processCloseTask(undefined, source, undefined);
+    });
+  };
+
   protected processInvokeTask = async(task: InvokeTask, source: MessageEventSource, event: MessageEvent) => {
     const id = task.id;
     const innerTask = task.payload;