feat(core): override layer number

packages/core/src/base-client.ts

@@ -146,6 +146,15 @@ export namespace BaseTelegramClient {
          * @default true
          */
         niceStacks?: boolean
+
+        /**
+         * **EXPERT USE ONLY!**
+         *
+         * Override TL layer used for the connection.                                                                                                                                                                                                                                  /;'
+         *
+         * **Does not** change the schema used.
+         */
+        overrideLayer?: number
     }
 }
 
@@ -207,6 +216,7 @@ export class BaseTelegramClient extends EventEmitter {
     protected _primaryDc: tl.RawDcOption
 
     private _niceStacks: boolean
+    readonly _layer: number
 
     private _keepAliveInterval: NodeJS.Timeout
     private _lastRequestTime = 0
@@ -265,6 +275,8 @@ export class BaseTelegramClient extends EventEmitter {
         this._disableUpdates = opts.disableUpdates ?? false
         this._niceStacks = opts.niceStacks ?? true
 
+        this._layer = opts.overrideLayer ?? tl.CURRENT_LAYER
+
         let deviceModel = 'mtcute on '
         if (typeof process !== 'undefined' && typeof require !== 'undefined') {
             const os = require('os')
@@ -310,6 +322,7 @@ export class BaseTelegramClient extends EventEmitter {
             transportFactory: this._transportFactory,
             dc: this._primaryDc,
             reconnectionStrategy: this._reconnectionStrategy,
+            layer: this._layer,
         })
         this.primaryConnection.on('usable', async () => {
             this._keepAliveInterval = setInterval(async () => {
@@ -654,6 +667,7 @@ export class BaseTelegramClient extends EventEmitter {
             transportFactory: this._transportFactory,
             reconnectionStrategy: this._reconnectionStrategy,
             inactivityTimeout,
+            layer: this._layer,
         })
 
         connection.on('error', (err) => this._emitError(err, connection))

packages/core/src/network/telegram-connection.ts

@@ -42,6 +42,7 @@ export interface TelegramConnectionParams extends PersistentConnectionParams {
     initConnection: tl.RawInitConnectionRequest
     inactivityTimeout?: number
     niceStacks?: boolean
+    layer: number
 }
 
 const messageHandlers: Record<string, string /* keyof TelegramConnection */> = {
@@ -668,7 +669,7 @@ export class TelegramConnection extends PersistentConnection {
             debug('wrapping %s with initConnection', message._)
             obj = {
                 _: 'invokeWithLayer',
-                layer: tl.CURRENT_LAYER,
+                layer: this.params.layer,
                 query: {
                     ...this.params.initConnection,
                     query: message,