Init project. Create simple backend. Add postgres in docker

backend/.env.example

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+DATABASE_TYPE=postgres
+DATABASE_HOST=localhost
+DATABASE_PORT=3306
+DATABASE_USER=root
+DATABASE_PASSWORD=root
+DATABASE_DATABASE=test

backend/.gitignore

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+# compiled output
+/dist
+/node_modules
+/build
+
+# Logs
+logs
+*.log
+npm-debug.log*
+pnpm-debug.log*
+yarn-debug.log*
+yarn-error.log*
+lerna-debug.log*
+
+# OS
+.DS_Store
+
+# Tests
+/coverage
+/.nyc_output
+
+# IDEs and editors
+/.idea
+.project
+.classpath
+.c9/
+*.launch
+.settings/
+*.sublime-workspace
+
+# IDE - VSCode
+.vscode/*
+!.vscode/settings.json
+!.vscode/tasks.json
+!.vscode/launch.json
+!.vscode/extensions.json
+
+# dotenv environment variable files
+.env
+.env.development.local
+.env.test.local
+.env.production.local
+.env.local
+
+# temp directory
+.temp
+.tmp
+
+# Runtime data
+pids
+*.pid
+*.seed
+*.pid.lock
+
+# Diagnostic reports (https://nodejs.org/api/report.html)
+report.[0-9]*.[0-9]*.[0-9]*.[0-9]*.json

backend/.prettierrc

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+{
+  "singleQuote": true,
+  "trailingComma": "all",
+  "endOfLine": "auto"
+}

backend/eslint.config.mjs

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+// @ts-check
+import eslint from '@eslint/js';
+import eslintPluginPrettierRecommended from 'eslint-plugin-prettier/recommended';
+import globals from 'globals';
+import tseslint from 'typescript-eslint';
+
+export default tseslint.config(
+  {
+    ignores: ['eslint.config.mjs'],
+  },
+  eslint.configs.recommended,
+  ...tseslint.configs.recommendedTypeChecked,
+  eslintPluginPrettierRecommended,
+  {
+    languageOptions: {
+      globals: {
+        ...globals.node,
+        ...globals.jest,
+      },
+      ecmaVersion: 5,
+      sourceType: 'module',
+      parserOptions: {
+        projectService: true,
+        tsconfigRootDir: import.meta.dirname,
+      },
+    },
+  },
+  {
+    rules: {
+      '@typescript-eslint/no-explicit-any': 'off',
+      '@typescript-eslint/no-floating-promises': 'warn',
+      '@typescript-eslint/no-unsafe-argument': 'warn',
+      'prettier/prettier': 0,
+    },
+  },
+);

backend/nest-cli.json

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+{
+  "$schema": "https://json.schemastore.org/nest-cli",
+  "collection": "@nestjs/schematics",
+  "sourceRoot": "src",
+  "compilerOptions": {
+    "deleteOutDir": true
+  }
+}

backend/package.json

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+{
+  "name": "chat",
+  "version": "0.0.1",
+  "description": "",
+  "author": "",
+  "private": true,
+  "license": "UNLICENSED",
+  "scripts": {
+    "build": "nest build",
+    "format": "prettier --write \"src/**/*.ts\" \"test/**/*.ts\"",
+    "start": "nest start",
+    "start:dev": "nest start --watch",
+    "start:debug": "nest start --debug --watch",
+    "start:prod": "node dist/main",
+    "lint": "eslint \"{src,apps,libs,test}/**/*.ts\" --fix",
+    "test": "jest",
+    "test:watch": "jest --watch",
+    "test:cov": "jest --coverage",
+    "test:debug": "node --inspect-brk -r tsconfig-paths/register -r ts-node/register node_modules/.bin/jest --runInBand",
+    "test:e2e": "jest --config ./test/jest-e2e.json"
+  },
+  "dependencies": {
+    "@nestjs/common": "^11.0.1",
+    "@nestjs/config": "^4.0.1",
+    "@nestjs/core": "^11.0.1",
+    "@nestjs/platform-express": "^11.0.1",
+    "@nestjs/swagger": "^11.0.6",
+    "@nestjs/typeorm": "^11.0.0",
+    "class-transformer": "^0.5.1",
+    "class-validator": "^0.14.1",
+    "mysql2": "^3.13.0",
+    "pg": "^8.14.0",
+    "reflect-metadata": "^0.2.2",
+    "rxjs": "^7.8.1",
+    "swagger-ui-express": "^5.0.1",
+    "typeorm": "^0.3.21"
+  },
+  "devDependencies": {
+    "@eslint/eslintrc": "^3.2.0",
+    "@eslint/js": "^9.18.0",
+    "@nestjs/cli": "^11.0.0",
+    "@nestjs/schematics": "^11.0.0",
+    "@nestjs/testing": "^11.0.1",
+    "@swc/cli": "^0.6.0",
+    "@swc/core": "^1.10.7",
+    "@types/express": "^5.0.0",
+    "@types/jest": "^29.5.14",
+    "@types/node": "^22.10.7",
+    "@types/supertest": "^6.0.2",
+    "eslint": "^9.18.0",
+    "eslint-config-prettier": "^10.0.1",
+    "eslint-plugin-prettier": "^5.2.2",
+    "globals": "^16.0.0",
+    "jest": "^29.7.0",
+    "prettier": "^3.4.2",
+    "source-map-support": "^0.5.21",
+    "supertest": "^7.0.0",
+    "ts-jest": "^29.2.5",
+    "ts-loader": "^9.5.2",
+    "ts-node": "^10.9.2",
+    "tsconfig-paths": "^4.2.0",
+    "typescript": "^5.7.3",
+    "typescript-eslint": "^8.20.0"
+  },
+  "jest": {
+    "moduleFileExtensions": [
+      "js",
+      "json",
+      "ts"
+    ],
+    "rootDir": "src",
+    "testRegex": ".*\\.spec\\.ts$",
+    "transform": {
+      "^.+\\.(t|j)s$": "ts-jest"
+    },
+    "collectCoverageFrom": [
+      "**/*.(t|j)s"
+    ],
+    "coverageDirectory": "../coverage",
+    "testEnvironment": "node"
+  }
+}

backend/src/configuration/configuration.ts

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+import { TypeOrmModuleOptions } from '@nestjs/typeorm';
+import { IDatabaseConfigKey } from './database';
+
+const config = {};
+
+export type IConfig = typeof config & {
+  [k in IDatabaseConfigKey]: TypeOrmModuleOptions;
+};
+
+const getConfig = () => config;
+export default getConfig;

backend/src/configuration/database.ts

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+import { registerAs } from '@nestjs/config';
+import { TypeOrmModuleOptions } from '@nestjs/typeorm';
+
+export const DatabaseConfigKey = 'database';
+export type IDatabaseConfigKey = typeof DatabaseConfigKey;
+
+export default registerAs(
+  DatabaseConfigKey,
+  (): TypeOrmModuleOptions => ({
+    type: 'postgres',
+    host: process.env.DATABASE_HOST,
+    port: +(process.env.DATABASE_PORT ?? 5432),
+    username: process.env.DATABASE_USER,
+    password: process.env.DATABASE_PASSWORD,
+    database: process.env.DATABASE_DATABASE,
+    synchronize: process.env.NODE_ENV !== 'production',
+    autoLoadEntities: true,
+  }),
+);

backend/src/controllers/message/index.ts

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+import { MessageController } from './message.controller';
+
+export default MessageController;

backend/src/controllers/message/message.controller.ts

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+import Message, { CreateMessageDTO } from '@/entities/message';
+import MessageService from '@/shared/services/message';
+import { Body, Controller, Get, Post } from '@nestjs/common';
+
+@Controller('message')
+export class MessageController {
+  constructor(private messageService: MessageService) {}
+
+  @Get()
+  async getTopOfHistory(): Promise<Message[]> {
+    return await this.messageService.getTopOfHistory();
+  }
+
+  @Post()
+  async send(@Body() message: CreateMessageDTO): Promise<Message> {
+    return await this.messageService.addMessage(message);
+  }
+}

backend/src/entities/message/index.ts

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+import { Message } from './message';
+export default Message;
+
+export { CreateMessageDTO } from './types';

backend/src/entities/message/message.ts

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+import { Entity, Column, PrimaryGeneratedColumn } from 'typeorm';
+
+@Entity()
+export class Message {
+  @PrimaryGeneratedColumn()
+  id: number;
+
+  @Column()
+  timeOfSend: string;
+
+  @Column()
+  sender: string;
+}

backend/src/entities/message/types.ts

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+import { ApiProperty } from '@nestjs/swagger';
+import { IsNotEmpty } from 'class-validator';
+
+export class CreateMessageDTO {
+  @ApiProperty()
+  @IsNotEmpty()
+  public timeOfSend: string;
+
+  @ApiProperty()
+  @IsNotEmpty()
+  public sender: string;
+}

backend/src/main.ts

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+import { NestFactory } from '@nestjs/core';
+import { SwaggerModule, DocumentBuilder } from '@nestjs/swagger';
+import { ValidationPipe } from '@nestjs/common';
+
+import AppModule from './modules/app';
+
+async function bootstrap() {
+  const app = await NestFactory.create(AppModule);
+  app.useGlobalPipes(new ValidationPipe());
+
+  const options = new DocumentBuilder()
+    .setTitle('Chat')
+    .setDescription(
+      'Chat - Asynchronous chat on WebSockets written on Next+Nest',
+    )
+    .build();
+  const document = SwaggerModule.createDocument(app, options);
+  SwaggerModule.setup('docs', app, document);
+
+  await app.listen(process.env.PORT ?? 8000);
+}
+bootstrap();

backend/src/modules/app/app.module.ts

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+import { Module } from '@nestjs/common';
+import { TypeOrmModule } from '@nestjs/typeorm';
+import { ConfigModule } from '@nestjs/config';
+
+import config from '@/configuration/configuration';
+import databaseConfig from '@/configuration/database';
+import MessageModule from '../message';
+
+@Module({
+  imports: [
+    ConfigModule.forRoot({
+      isGlobal: true,
+      load: [config],
+    }),
+    TypeOrmModule.forRoot(databaseConfig()),
+
+    MessageModule,
+  ],
+})
+export class AppModule {}

backend/src/modules/app/index.ts

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+import { AppModule } from './app.module';
+
+export default AppModule;

backend/src/modules/message/index.ts

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+import { MessageModule } from './message.module';
+
+export default MessageModule;

backend/src/modules/message/message.module.ts

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+import MessageController from '@/controllers/message';
+import Message from '@/entities/message';
+import MessageService from '@/shared/services/message';
+import { Module } from '@nestjs/common';
+import { TypeOrmModule } from '@nestjs/typeorm';
+
+@Module({
+  imports: [TypeOrmModule.forFeature([Message])],
+  controllers: [MessageController],
+  providers: [MessageService],
+})
+export class MessageModule {}

backend/src/shared/services/message/index.ts

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+import { MessageService } from './message.service';
+
+export default MessageService;

backend/src/shared/services/message/message.service.ts

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+import Message, { CreateMessageDTO } from '@/entities/message';
+import { Injectable } from '@nestjs/common';
+import { InjectRepository } from '@nestjs/typeorm';
+import { Repository } from 'typeorm';
+
+@Injectable()
+export class MessageService {
+  constructor(
+    @InjectRepository(Message)
+    private messageRepository: Repository<Message>,
+  ) {}
+
+  getTopOfHistory = () =>
+    this.messageRepository
+      .createQueryBuilder('message')
+      .orderBy('message.id', 'DESC')
+      .limit(20)
+      .getMany();
+
+  addMessage = (message: CreateMessageDTO): Promise<Message> =>
+    this.messageRepository.save(message);
+}

backend/tsconfig.build.json

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+{
+  "extends": "./tsconfig.json",
+  "exclude": ["node_modules", "test", "dist", "**/*spec.ts"]
+}

backend/tsconfig.json

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+{
+  "compilerOptions": {
+    "module": "commonjs",
+    "declaration": true,
+    "removeComments": true,
+    "emitDecoratorMetadata": true,
+    "experimentalDecorators": true,
+    "allowSyntheticDefaultImports": true,
+    "target": "ES2023",
+    "sourceMap": true,
+    "outDir": "./dist",
+    "baseUrl": "./",
+    "incremental": true,
+    "skipLibCheck": true,
+    "strictNullChecks": true,
+    "forceConsistentCasingInFileNames": true,
+    "noImplicitAny": false,
+    "strictBindCallApply": false,
+    "noFallthroughCasesInSwitch": false,
+    "paths": {
+      "@/*": ["src/*"],
+    }
+  }
+}