diff --git a/lib/decorators/telegraf-action.decorator.ts b/lib/decorators/telegraf-action.decorator.ts
index ed58872..2fd6781 100644
--- a/lib/decorators/telegraf-action.decorator.ts
+++ b/lib/decorators/telegraf-action.decorator.ts
@@ -2,12 +2,20 @@ import { SetMetadata } from '@nestjs/common';
 import { DECORATORS } from '../telegraf.constants';
 import { HearsTriggers } from 'telegraf';
 
+export type TelegrafActionTriggers = HearsTriggers;
+
+export interface TelegrafActionMetadata {
+  triggers: TelegrafActionTriggers;
+}
+
 /**
  * Registers middleware for handling callback_data actions with regular expressions.
  * @param triggers Triggers
  *
  * https://telegraf.js.org/#/?id=action
  */
-export function TelegrafAction(triggers: HearsTriggers): MethodDecorator {
+export function TelegrafAction(
+  triggers: TelegrafActionTriggers,
+): MethodDecorator {
   return SetMetadata(DECORATORS.ACTION, { triggers });
 }
diff --git a/lib/decorators/telegraf-cashtag.decorator.ts b/lib/decorators/telegraf-cashtag.decorator.ts
index 40a6038..136c8c8 100644
--- a/lib/decorators/telegraf-cashtag.decorator.ts
+++ b/lib/decorators/telegraf-cashtag.decorator.ts
@@ -1,12 +1,20 @@
 import { SetMetadata } from '@nestjs/common';
 import { DECORATORS } from '../telegraf.constants';
 
+export type TelegrafCashtagCashtag = string | string[];
+
+export interface TelegrafCashtagMetadata {
+  cashtag: TelegrafCashtagCashtag;
+}
+
 /**
  * Cashtag handling.
  * @param cashtag Cashtag
  *
  * https://telegraf.js.org/#/?id=cashtag
  */
-export function TelegrafCashtag(cashtag: string | string[]): MethodDecorator {
+export function TelegrafCashtag(
+  cashtag: TelegrafCashtagCashtag,
+): MethodDecorator {
   return SetMetadata(DECORATORS.CASHTAG, { cashtag });
 }
diff --git a/lib/decorators/telegraf-command.decorator.ts b/lib/decorators/telegraf-command.decorator.ts
index bb20866..7f1570c 100644
--- a/lib/decorators/telegraf-command.decorator.ts
+++ b/lib/decorators/telegraf-command.decorator.ts
@@ -1,12 +1,20 @@
 import { SetMetadata } from '@nestjs/common';
 import { DECORATORS } from '../telegraf.constants';
 
+export type TelegrafCommandCommands = string | string[];
+
+export interface TelegrafCommandMetadata {
+  commands: TelegrafCommandCommands;
+}
+
 /**
  * Command handling.
  * @param commands Commands
  *
  * https://telegraf.js.org/#/?id=command
  */
-export function TelegrafCommand(commands: string | string[]): MethodDecorator {
+export function TelegrafCommand(
+  commands: TelegrafCommandCommands,
+): MethodDecorator {
   return SetMetadata(DECORATORS.COMMAND, { commands });
 }
diff --git a/lib/decorators/telegraf-entity.decorator.ts b/lib/decorators/telegraf-entity.decorator.ts
index cf1173d..b32c173 100644
--- a/lib/decorators/telegraf-entity.decorator.ts
+++ b/lib/decorators/telegraf-entity.decorator.ts
@@ -1,7 +1,16 @@
 import { SetMetadata } from '@nestjs/common';
 import { DECORATORS } from '../telegraf.constants';
 
-export type Entity = string | string[] | RegExp | RegExp[] | Function;
+export type TelegrafEntityEntity =
+  | string
+  | string[]
+  | RegExp
+  | RegExp[]
+  | Function;
+
+export interface TelegrafEntityMetadata {
+  entity: TelegrafEntityEntity;
+}
 
 /**
  * Entity handling.
@@ -9,6 +18,6 @@ export type Entity = string | string[] | RegExp | RegExp[] | Function;
  *
  * https://telegraf.js.org/#/?id=entity
  */
-export function TelegrafEntity(entity: Entity): MethodDecorator {
+export function TelegrafEntity(entity: TelegrafEntityEntity): MethodDecorator {
   return SetMetadata(DECORATORS.ENTITY, { entity });
 }
diff --git a/lib/decorators/telegraf-hashtag.decorator.ts b/lib/decorators/telegraf-hashtag.decorator.ts
index 7ab3942..3265213 100644
--- a/lib/decorators/telegraf-hashtag.decorator.ts
+++ b/lib/decorators/telegraf-hashtag.decorator.ts
@@ -1,12 +1,20 @@
 import { SetMetadata } from '@nestjs/common';
 import { DECORATORS } from '../telegraf.constants';
 
+export type TelegrafHashtagHashtag = string | string[];
+
+export interface TelegrafHashtagMetadata {
+  hashtag: TelegrafHashtagHashtag;
+}
+
 /**
  * Hashtag handling.
  * @param hashtag Hashtag
  *
  * https://telegraf.js.org/#/?id=hashtag
  */
-export function TelegrafHashtag(hashtag: string | string[]): MethodDecorator {
+export function TelegrafHashtag(
+  hashtag: TelegrafHashtagHashtag,
+): MethodDecorator {
   return SetMetadata(DECORATORS.HASHTAG, { hashtag });
 }
diff --git a/lib/decorators/telegraf-hears.decorator.ts b/lib/decorators/telegraf-hears.decorator.ts
index b9c44fb..17b8d1b 100644
--- a/lib/decorators/telegraf-hears.decorator.ts
+++ b/lib/decorators/telegraf-hears.decorator.ts
@@ -2,12 +2,20 @@ import { SetMetadata } from '@nestjs/common';
 import { DECORATORS } from '../telegraf.constants';
 import { HearsTriggers } from 'telegraf';
 
+export type TelegrafHearsTriggers = HearsTriggers;
+
+export interface TelegrafHearsMetadata {
+  triggers: TelegrafHearsTriggers;
+}
+
 /**
  * Registers middleware for handling text messages.
  * @param triggers Triggers
  *
  * https://telegraf.js.org/#/?id=hears
  */
-export function TelegrafHears(triggers: HearsTriggers): MethodDecorator {
+export function TelegrafHears(
+  triggers: TelegrafHearsTriggers,
+): MethodDecorator {
   return SetMetadata(DECORATORS.HEARS, { triggers: triggers });
 }
diff --git a/lib/decorators/telegraf-inline-query.decorator.ts b/lib/decorators/telegraf-inline-query.decorator.ts
index 2f3b6e6..1a4cc4f 100644
--- a/lib/decorators/telegraf-inline-query.decorator.ts
+++ b/lib/decorators/telegraf-inline-query.decorator.ts
@@ -1,7 +1,11 @@
 import { SetMetadata } from '@nestjs/common';
 import { DECORATORS } from '../telegraf.constants';
 
-export type Triggers = string | string[] | RegExp | RegExp[];
+export type TelegrafInlineQueryTriggers = string | string[] | RegExp | RegExp[];
+
+export interface TelegrafInlineQueryMetadata {
+  triggers: TelegrafInlineQueryTriggers;
+}
 
 /**
  * Registers middleware for handling inline_query actions with regular expressions.
@@ -9,6 +13,8 @@ export type Triggers = string | string[] | RegExp | RegExp[];
  *
  * https://telegraf.js.org/#/?id=inlinequery
  */
-export function TelegrafInlineQuery(triggers: Triggers): MethodDecorator {
+export function TelegrafInlineQuery(
+  triggers: TelegrafInlineQueryTriggers,
+): MethodDecorator {
   return SetMetadata(DECORATORS.INLINE_QUERY, { triggers });
 }
diff --git a/lib/decorators/telegraf-mention.decorator.ts b/lib/decorators/telegraf-mention.decorator.ts
index e7a643b..90dbc6b 100644
--- a/lib/decorators/telegraf-mention.decorator.ts
+++ b/lib/decorators/telegraf-mention.decorator.ts
@@ -1,12 +1,20 @@
 import { SetMetadata } from '@nestjs/common';
 import { DECORATORS } from '../telegraf.constants';
 
+export type TelegrafMentionUsername = string | string[];
+
+export interface TelegrafMentionMetadata {
+  username: TelegrafMentionUsername;
+}
+
 /**
  * Mention handling.
  * @param username Username
  *
  * https://telegraf.js.org/#/?id=mention
  */
-export function TelegrafMention(username: string | string[]): MethodDecorator {
+export function TelegrafMention(
+  username: TelegrafMentionUsername,
+): MethodDecorator {
   return SetMetadata(DECORATORS.MENTION, { username });
 }
diff --git a/lib/decorators/telegraf-on.decorator.ts b/lib/decorators/telegraf-on.decorator.ts
index b6a2a60..4fe3ac0 100644
--- a/lib/decorators/telegraf-on.decorator.ts
+++ b/lib/decorators/telegraf-on.decorator.ts
@@ -2,6 +2,16 @@ import { SetMetadata } from '@nestjs/common';
 import { DECORATORS } from '../telegraf.constants';
 import { UpdateType, MessageSubTypes } from 'telegraf/typings/telegram-types';
 
+export type TelegrafOnUpdateTypes =
+  | UpdateType
+  | UpdateType[]
+  | MessageSubTypes
+  | MessageSubTypes[];
+
+export interface TelegrafOnMetadata {
+  updateTypes: TelegrafOnUpdateTypes;
+}
+
 /**
  * Registers middleware for provided update type.
  * @param updateTypes Update type
@@ -9,7 +19,7 @@ import { UpdateType, MessageSubTypes } from 'telegraf/typings/telegram-types';
  * https://telegraf.js.org/#/?id=on
  */
 export function TelegrafOn(
-  updateTypes: UpdateType | UpdateType[] | MessageSubTypes | MessageSubTypes[],
+  updateTypes: TelegrafOnUpdateTypes,
 ): MethodDecorator {
   return SetMetadata(DECORATORS.ON, { updateTypes: updateTypes });
 }
diff --git a/lib/decorators/telegraf-phone.decorator.ts b/lib/decorators/telegraf-phone.decorator.ts
index 05ee3e9..8182150 100644
--- a/lib/decorators/telegraf-phone.decorator.ts
+++ b/lib/decorators/telegraf-phone.decorator.ts
@@ -1,12 +1,18 @@
 import { SetMetadata } from '@nestjs/common';
 import { DECORATORS } from '../telegraf.constants';
 
+export type TelegrafPhonePhone = string | string[];
+
+export interface TelegrafPhoneMetadata {
+  phone: TelegrafPhonePhone;
+}
+
 /**
  * Phone number handling.
  * @param phone Phone number
  *
  * https://telegraf.js.org/#/?id=phone
  */
-export function TelegrafPhone(phone: string | string[]): MethodDecorator {
+export function TelegrafPhone(phone: TelegrafPhonePhone): MethodDecorator {
   return SetMetadata(DECORATORS.PHONE, { phone });
 }
diff --git a/lib/telegraf-metadata.accessor.ts b/lib/telegraf-metadata.accessor.ts
index b4da7bc..b35b8cf 100644
--- a/lib/telegraf-metadata.accessor.ts
+++ b/lib/telegraf-metadata.accessor.ts
@@ -1,6 +1,18 @@
 import { Injectable, Type } from '@nestjs/common';
 import { Reflector } from '@nestjs/core';
-import { TelegrafStart } from './decorators';
+import {
+  TelegrafActionMetadata,
+  TelegrafCashtagMetadata,
+  TelegrafCommandMetadata,
+  TelegrafEntityMetadata,
+  TelegrafHashtagMetadata,
+  TelegrafHearsMetadata,
+  TelegrafInlineQueryMetadata,
+  TelegrafMentionMetadata,
+  TelegrafOnMetadata,
+  TelegrafPhoneMetadata,
+  TelegrafStart,
+} from './decorators';
 import { DECORATORS } from './telegraf.constants';
 
 @Injectable()
@@ -21,7 +33,9 @@ export class TelegrafMetadataAccessor {
     return !!this.reflector.get(DECORATORS.ON, target);
   }
 
-  getTelegrafOnMetadata(target: Type<any> | Function) {
+  getTelegrafOnMetadata(
+    target: Type<any> | Function,
+  ): TelegrafOnMetadata | undefined {
     return this.reflector.get(DECORATORS.ON, target);
   }
 
@@ -32,7 +46,9 @@ export class TelegrafMetadataAccessor {
     return !!this.reflector.get(DECORATORS.HEARS, target);
   }
 
-  getTelegrafHearsMetadata(target: Type<any> | Function) {
+  getTelegrafHearsMetadata(
+    target: Type<any> | Function,
+  ): TelegrafHearsMetadata | undefined {
     return this.reflector.get(DECORATORS.HEARS, target);
   }
 
@@ -43,7 +59,9 @@ export class TelegrafMetadataAccessor {
     return !!this.reflector.get(DECORATORS.COMMAND, target);
   }
 
-  getTelegrafCommandMetadata(target: Type<any> | Function) {
+  getTelegrafCommandMetadata(
+    target: Type<any> | Function,
+  ): TelegrafCommandMetadata | undefined {
     return this.reflector.get(DECORATORS.COMMAND, target);
   }
 
@@ -75,7 +93,9 @@ export class TelegrafMetadataAccessor {
     return !!this.reflector.get(DECORATORS.ENTITY, target);
   }
 
-  getTelegrafEntityMetadata(target: Type<any> | Function) {
+  getTelegrafEntityMetadata(
+    target: Type<any> | Function,
+  ): TelegrafEntityMetadata | undefined {
     return this.reflector.get(DECORATORS.ENTITY, target);
   }
 
@@ -86,7 +106,9 @@ export class TelegrafMetadataAccessor {
     return !!this.reflector.get(DECORATORS.MENTION, target);
   }
 
-  getTelegrafMentionMetadata(target: Type<any> | Function) {
+  getTelegrafMentionMetadata(
+    target: Type<any> | Function,
+  ): TelegrafMentionMetadata | undefined {
     return this.reflector.get(DECORATORS.MENTION, target);
   }
 
@@ -97,7 +119,9 @@ export class TelegrafMetadataAccessor {
     return !!this.reflector.get(DECORATORS.PHONE, target);
   }
 
-  getTelegrafPhoneMetadata(target: Type<any> | Function) {
+  getTelegrafPhoneMetadata(
+    target: Type<any> | Function,
+  ): TelegrafPhoneMetadata | undefined {
     return this.reflector.get(DECORATORS.PHONE, target);
   }
 
@@ -108,7 +132,9 @@ export class TelegrafMetadataAccessor {
     return !!this.reflector.get(DECORATORS.HASHTAG, target);
   }
 
-  getTelegrafHashtagMetadata(target: Type<any> | Function) {
+  getTelegrafHashtagMetadata(
+    target: Type<any> | Function,
+  ): TelegrafHashtagMetadata | undefined {
     return this.reflector.get(DECORATORS.HASHTAG, target);
   }
 
@@ -119,7 +145,9 @@ export class TelegrafMetadataAccessor {
     return !!this.reflector.get(DECORATORS.CASHTAG, target);
   }
 
-  getTelegrafCashtagMetadata(target: Type<any> | Function) {
+  getTelegrafCashtagMetadata(
+    target: Type<any> | Function,
+  ): TelegrafCashtagMetadata | undefined {
     return this.reflector.get(DECORATORS.CASHTAG, target);
   }
 
@@ -130,7 +158,9 @@ export class TelegrafMetadataAccessor {
     return !!this.reflector.get(DECORATORS.ACTION, target);
   }
 
-  getTelegrafActionMetadata(target: Type<any> | Function) {
+  getTelegrafActionMetadata(
+    target: Type<any> | Function,
+  ): TelegrafActionMetadata | undefined {
     return this.reflector.get(DECORATORS.ACTION, target);
   }
 
@@ -141,7 +171,9 @@ export class TelegrafMetadataAccessor {
     return !!this.reflector.get(DECORATORS.INLINE_QUERY, target);
   }
 
-  getTelegrafInlineQueryMetadata(target: Type<any> | Function) {
+  getTelegrafInlineQueryMetadata(
+    target: Type<any> | Function,
+  ): TelegrafInlineQueryMetadata | undefined {
     return this.reflector.get(DECORATORS.INLINE_QUERY, target);
   }
 
diff --git a/lib/telegraf.explorer.ts b/lib/telegraf.explorer.ts
index 26af964..503d68b 100644
--- a/lib/telegraf.explorer.ts
+++ b/lib/telegraf.explorer.ts
@@ -7,6 +7,18 @@ import { TelegrafMetadataAccessor } from './telegraf-metadata.accessor';
 import { TelegrafProvider } from './telegraf.provider';
 import { TELEGRAF_PROVIDER } from './telegraf.constants';
 import { ContextMessageUpdate } from 'telegraf';
+import {
+  TelegrafActionMetadata,
+  TelegrafCashtagMetadata,
+  TelegrafCommandMetadata,
+  TelegrafEntityMetadata,
+  TelegrafHashtagMetadata,
+  TelegrafHearsMetadata,
+  TelegrafInlineQueryMetadata,
+  TelegrafMentionMetadata,
+  TelegrafOnMetadata,
+  TelegrafPhoneMetadata,
+} from './decorators';
 
 @Injectable()
 export class TelegrafExplorer implements OnModuleInit {
@@ -119,7 +131,7 @@ export class TelegrafExplorer implements OnModuleInit {
     instance: object,
     key: string,
     telegraf: Telegraf<ContextMessageUpdate>,
-    metadata: any,
+    metadata: TelegrafOnMetadata,
   ) {
     telegraf.on(metadata.updateTypes, instance[key].bind(instance));
   }
@@ -128,7 +140,7 @@ export class TelegrafExplorer implements OnModuleInit {
     instance: object,
     key: string,
     telegraf: Telegraf<ContextMessageUpdate>,
-    metadata: any,
+    metadata: TelegrafHearsMetadata,
   ) {
     telegraf.hears(metadata.triggers, instance[key].bind(instance));
   }
@@ -137,7 +149,7 @@ export class TelegrafExplorer implements OnModuleInit {
     instance: object,
     key: string,
     telegraf: Telegraf<ContextMessageUpdate>,
-    metadata: any,
+    metadata: TelegrafCommandMetadata,
   ) {
     telegraf.command(metadata.commands, instance[key].bind(instance));
   }
@@ -171,7 +183,7 @@ export class TelegrafExplorer implements OnModuleInit {
     instance: object,
     key: string,
     telegraf: Telegraf<ContextMessageUpdate>,
-    metadata: any,
+    metadata: TelegrafEntityMetadata,
   ) {
     // @ts-ignore
     telegraf.entity(metadata.entity, instance[key].bind(instance));
@@ -181,7 +193,7 @@ export class TelegrafExplorer implements OnModuleInit {
     instance: object,
     key: string,
     telegraf: Telegraf<ContextMessageUpdate>,
-    metadata: any,
+    metadata: TelegrafMentionMetadata,
   ) {
     // @ts-ignore
     telegraf.mention(metadata.username, instance[key].bind(instance));
@@ -191,7 +203,7 @@ export class TelegrafExplorer implements OnModuleInit {
     instance: object,
     key: string,
     telegraf: Telegraf<ContextMessageUpdate>,
-    metadata: any,
+    metadata: TelegrafPhoneMetadata,
   ) {
     // @ts-ignore
     telegraf.phone(metadata.phone, instance[key].bind(instance));
@@ -201,7 +213,7 @@ export class TelegrafExplorer implements OnModuleInit {
     instance: object,
     key: string,
     telegraf: Telegraf<ContextMessageUpdate>,
-    metadata: any,
+    metadata: TelegrafHashtagMetadata,
   ) {
     // @ts-ignore
     telegraf.hashtag(metadata.hashtag, instance[key].bind(instance));
@@ -211,7 +223,7 @@ export class TelegrafExplorer implements OnModuleInit {
     instance: object,
     key: string,
     telegraf: Telegraf<ContextMessageUpdate>,
-    metadata: any,
+    metadata: TelegrafCashtagMetadata,
   ) {
     // @ts-ignore
     telegraf.cashtag(metadata.cashtag, instance[key].bind(instance));
@@ -221,7 +233,7 @@ export class TelegrafExplorer implements OnModuleInit {
     instance: object,
     key: string,
     telegraf: Telegraf<ContextMessageUpdate>,
-    metadata: any,
+    metadata: TelegrafActionMetadata,
   ) {
     telegraf.action(metadata.triggers, instance[key].bind(instance));
   }
@@ -230,7 +242,7 @@ export class TelegrafExplorer implements OnModuleInit {
     instance: object,
     key: string,
     telegraf: Telegraf<ContextMessageUpdate>,
-    metadata: any,
+    metadata: TelegrafInlineQueryMetadata,
   ) {
     // @ts-ignore
     telegraf.inlineQuery(metadata.triggers, instance[key].bind(instance));
diff --git a/lib/telegraf.provider.ts b/lib/telegraf.provider.ts
index 4f16c60..b13626f 100644
--- a/lib/telegraf.provider.ts
+++ b/lib/telegraf.provider.ts
@@ -3,6 +3,7 @@ import {
   Inject,
   OnApplicationBootstrap,
   Logger,
+  OnApplicationShutdown,
 } from '@nestjs/common';
 import Telegraf, { ContextMessageUpdate } from 'telegraf';
 import { TELEGRAF_MODULE_OPTIONS } from './telegraf.constants';
@@ -12,7 +13,7 @@ import { TelegrafModuleOptions } from './interfaces';
 // @ts-ignore
 export class TelegrafProvider<TContext extends ContextMessageUpdate>
   extends Telegraf<TContext>
-  implements OnApplicationBootstrap {
+  implements OnApplicationBootstrap, OnApplicationShutdown {
   private logger = new Logger('Telegraf');
 
   constructor(@Inject(TELEGRAF_MODULE_OPTIONS) options: TelegrafModuleOptions) {
@@ -25,4 +26,8 @@ export class TelegrafProvider<TContext extends ContextMessageUpdate>
     });
     this.startPolling();
   }
+
+  async onApplicationShutdown(signal?: string) {
+    await this.stop();
+  }
 }