refactor configuration using dddlibrary

src/modules/messager/messager.di-tokens.ts

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+export const MESSAGE_PUBLISHER = Symbol('MESSAGE_PUBLISHER');

src/modules/messager/messager.module.ts

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+import { Module, Provider } from '@nestjs/common';
+import { MESSAGE_PUBLISHER } from './messager.di-tokens';
+
+import { ConfigModule, ConfigService } from '@nestjs/config';
+import { SERVICE_NAME } from '@src/app.constants';
+import {
+  MessageBrokerModule,
+  MessageBrokerModuleOptions,
+  MessageBrokerPublisher,
+} from '@mobicoop/message-broker-module';
+
+const imports = [
+  MessageBrokerModule.forRootAsync({
+    imports: [ConfigModule],
+    inject: [ConfigService],
+    useFactory: async (
+      configService: ConfigService,
+    ): Promise<MessageBrokerModuleOptions> => ({
+      uri: configService.get<string>('MESSAGE_BROKER_URI') as string,
+      exchange: {
+        name: configService.get<string>('MESSAGE_BROKER_EXCHANGE') as string,
+        durable: configService.get<boolean>(
+          'MESSAGE_BROKER_EXCHANGE_DURABILITY',
+        ) as boolean,
+      },
+      name: SERVICE_NAME,
+    }),
+  }),
+];
+
+const providers: Provider[] = [
+  {
+    provide: MESSAGE_PUBLISHER,
+    useClass: MessageBrokerPublisher,
+  },
+];
+
+@Module({
+  imports,
+  providers,
+  exports: [MESSAGE_PUBLISHER],
+})
+export class MessagerModule {}