Enable ES Module for the example

package.json

@@ -3,6 +3,7 @@
   "version": "1.0.0",
   "description": "Nest CQRS module usage example",
   "license": "MIT",
+  "type": "module",
   "scripts": {
     "start": "nest start --watch"
   },

src/app.module.ts

@@ -1,5 +1,5 @@
 import { Module } from '@nestjs/common';
-import { HeroesGameModule } from './heroes/heroes.module';
+import { HeroesGameModule } from './heroes/heroes.module.js';
 
 @Module({
   imports: [HeroesGameModule],

src/heroes/commands/handlers/drop-ancient-item.handler.ts

@@ -1,7 +1,7 @@
 import { CommandHandler, EventPublisher, ICommandHandler } from '@nestjs/cqrs';
 import * as clc from 'cli-color';
-import { HeroRepository } from '../../repository/hero.repository';
-import { DropAncientItemCommand } from '../impl/drop-ancient-item.command';
+import { HeroRepository } from '../../repository/hero.repository.js';
+import { DropAncientItemCommand } from '../impl/drop-ancient-item.command.js';
 
 @CommandHandler(DropAncientItemCommand)
 export class DropAncientItemHandler

src/heroes/commands/handlers/index.ts

@@ -1,4 +1,4 @@
-import { KillDragonHandler } from './kill-dragon.handler';
-import { DropAncientItemHandler } from './drop-ancient-item.handler';
+import { KillDragonHandler } from './kill-dragon.handler.js';
+import { DropAncientItemHandler } from './drop-ancient-item.handler.js';
 
 export const CommandHandlers = [KillDragonHandler, DropAncientItemHandler];

src/heroes/commands/handlers/kill-dragon.handler.ts

@@ -1,7 +1,7 @@
 import { CommandHandler, EventPublisher, ICommandHandler } from '@nestjs/cqrs';
 import * as clc from 'cli-color';
-import { HeroRepository } from '../../repository/hero.repository';
-import { KillDragonCommand } from '../impl/kill-dragon.command';
+import { HeroRepository } from '../../repository/hero.repository.js';
+import { KillDragonCommand } from '../impl/kill-dragon.command.js';
 
 @CommandHandler(KillDragonCommand)
 export class KillDragonHandler implements ICommandHandler<KillDragonCommand> {

src/heroes/events/handlers/hero-found-item.handler.ts

@@ -1,6 +1,6 @@
 import { EventsHandler, IEventHandler } from '@nestjs/cqrs';
 import * as clc from 'cli-color';
-import { HeroFoundItemEvent } from '../impl/hero-found-item.event';
+import { HeroFoundItemEvent } from '../impl/hero-found-item.event.js';
 
 @EventsHandler(HeroFoundItemEvent)
 export class HeroFoundItemHandler implements IEventHandler<HeroFoundItemEvent> {

src/heroes/events/handlers/hero-killed-dragon.handler.ts

@@ -1,7 +1,7 @@
 import { IEventHandler } from '@nestjs/cqrs';
-import { EventsHandler } from '@nestjs/cqrs/dist/decorators/events-handler.decorator';
+import { EventsHandler } from '@nestjs/cqrs/dist/decorators/events-handler.decorator.js';
 import * as clc from 'cli-color';
-import { HeroKilledDragonEvent } from '../impl/hero-killed-dragon.event';
+import { HeroKilledDragonEvent } from '../impl/hero-killed-dragon.event.js';
 
 @EventsHandler(HeroKilledDragonEvent)
 export class HeroKilledDragonHandler

src/heroes/events/handlers/index.ts

@@ -1,4 +1,4 @@
-import { HeroKilledDragonHandler } from './hero-killed-dragon.handler';
-import { HeroFoundItemHandler } from './hero-found-item.handler';
+import { HeroKilledDragonHandler } from './hero-killed-dragon.handler.js';
+import { HeroFoundItemHandler } from './hero-found-item.handler.js';
 
 export const EventHandlers = [HeroKilledDragonHandler, HeroFoundItemHandler];

src/heroes/heroes.controller.ts

@@ -1,9 +1,9 @@
 import { Body, Controller, Get, Param, Post } from '@nestjs/common';
 import { CommandBus, QueryBus } from '@nestjs/cqrs';
-import { KillDragonCommand } from './commands/impl/kill-dragon.command';
-import { KillDragonDto } from './interfaces/kill-dragon-dto.interface';
-import { Hero } from './models/hero.model';
-import { GetHeroesQuery } from './queries/impl';
+import { KillDragonCommand } from './commands/impl/kill-dragon.command.js';
+import { KillDragonDto } from './interfaces/kill-dragon-dto.interface.js';
+import { Hero } from './models/hero.model.js';
+import { GetHeroesQuery } from './queries/impl/index.js';
 
 @Controller('hero')
 export class HeroesGameController {

src/heroes/heroes.module.ts

@@ -1,11 +1,11 @@
 import { Module } from '@nestjs/common';
 import { CqrsModule } from '@nestjs/cqrs';
-import { CommandHandlers } from './commands/handlers';
-import { EventHandlers } from './events/handlers';
-import { HeroesGameController } from './heroes.controller';
-import { QueryHandlers } from './queries/handlers';
-import { HeroRepository } from './repository/hero.repository';
-import { HeroesGameSagas } from './sagas/heroes.sagas';
+import { CommandHandlers } from './commands/handlers/index.js';
+import { EventHandlers } from './events/handlers/index.js';
+import { HeroesGameController } from './heroes.controller.js';
+import { QueryHandlers } from './queries/handlers/index.js';
+import { HeroRepository } from './repository/hero.repository.js';
+import { HeroesGameSagas } from './sagas/heroes.sagas.js';
 
 @Module({
   imports: [CqrsModule],

src/heroes/models/hero.model.ts

@@ -1,6 +1,6 @@
 import { AggregateRoot } from '@nestjs/cqrs';
-import { HeroFoundItemEvent } from '../events/impl/hero-found-item.event';
-import { HeroKilledDragonEvent } from '../events/impl/hero-killed-dragon.event';
+import { HeroFoundItemEvent } from '../events/impl/hero-found-item.event.js';
+import { HeroKilledDragonEvent } from '../events/impl/hero-killed-dragon.event.js';
 
 export class Hero extends AggregateRoot {
   constructor(private readonly id: string) {

src/heroes/queries/handlers/get-heroes.handler.ts

@@ -1,7 +1,7 @@
 import { IQueryHandler, QueryHandler } from '@nestjs/cqrs';
 import * as clc from 'cli-color';
-import { HeroRepository } from '../../repository/hero.repository';
-import { GetHeroesQuery } from '../impl';
+import { HeroRepository } from '../../repository/hero.repository.js';
+import { GetHeroesQuery } from '../impl/index.js';
 
 @QueryHandler(GetHeroesQuery)
 export class GetHeroesHandler implements IQueryHandler<GetHeroesQuery> {

src/heroes/queries/handlers/index.ts

@@ -1,3 +1,3 @@
-import { GetHeroesHandler } from './get-heroes.handler';
+import { GetHeroesHandler } from './get-heroes.handler.js';
 
 export const QueryHandlers = [GetHeroesHandler];

src/heroes/queries/impl/index.ts

@@ -1 +1 @@
-export * from './get-heroes.query';
+export * from './get-heroes.query.js';

src/heroes/repository/fixtures/user.ts

@@ -1,3 +1,3 @@
-import { Hero } from '../../models/hero.model';
+import { Hero } from '../../models/hero.model.js';
 
 export const userHero = new Hero('1234');

src/heroes/repository/hero.repository.ts

@@ -1,6 +1,6 @@
 import { Injectable } from '@nestjs/common';
-import { Hero } from '../models/hero.model';
-import { userHero } from './fixtures/user';
+import { Hero } from '../models/hero.model.js';
+import { userHero } from './fixtures/user.js';
 
 @Injectable()
 export class HeroRepository {

src/heroes/sagas/heroes.sagas.ts

@@ -3,8 +3,8 @@ import { ICommand, ofType, Saga } from '@nestjs/cqrs';
 import * as clc from 'cli-color';
 import { Observable } from 'rxjs';
 import { delay, map } from 'rxjs/operators';
-import { DropAncientItemCommand } from '../commands/impl/drop-ancient-item.command';
-import { HeroKilledDragonEvent } from '../events/impl/hero-killed-dragon.event';
+import { DropAncientItemCommand } from '../commands/impl/drop-ancient-item.command.js';
+import { HeroKilledDragonEvent } from '../events/impl/hero-killed-dragon.event.js';
 
 const itemId = '0';
 

src/main.ts

@@ -1,5 +1,5 @@
 import { NestFactory } from '@nestjs/core';
-import { ApplicationModule } from './app.module';
+import { ApplicationModule } from './app.module.js';
 
 async function bootstrap() {
   const app = await NestFactory.create(ApplicationModule);

tsconfig.json

@@ -1,6 +1,7 @@
 {
   "compilerOptions": {
-    "module": "commonjs",
+    "module": "esnext",
+    "moduleResolution": "node",
     "declaration": false,
     "noImplicitAny": false,
     "noUnusedLocals": true,