refactor: update code style and improve ESLint rules for better consistency

.prettierrc

@@ -1,4 +1,7 @@
 {
-  "singleQuote": true,
-  "trailingComma": "all"
+  "singleQuote": false,
+  "trailingComma": "all",
+  "tabWidth": 4,
+  "useTabs": false,
+  "semi": true
 }

eslint.config.mjs

@@ -27,9 +27,30 @@ export default tseslint.config(
   {
     rules: {
       '@typescript-eslint/no-explicit-any': 'off',
-      '@typescript-eslint/no-floating-promises': 'warn',
+      '@typescript-eslint/no-floating-promises': 'error',            // asegurar manejo de promesas
       '@typescript-eslint/no-unsafe-argument': 'warn',
-      "prettier/prettier": ["error", { endOfLine: "auto" }],
+      '@typescript-eslint/prefer-nullish-coalescing': 'warn',        // usar ?? en lugar de ||
+      '@typescript-eslint/prefer-optional-chain': 'warn',            // usar ?. en lugar de && encadenados
+      '@typescript-eslint/no-unnecessary-condition': 'warn',         // condiciones que siempre son true/false
+      '@typescript-eslint/switch-exhaustiveness-check': 'error',     // switch sobre union types debe cubrir todos los casos
+      'prettier/prettier': ['error', { endOfLine: 'auto' }],
+      '@typescript-eslint/await-thenable': 'error',                  // no hacer await de algo que no es Promise
+      '@typescript-eslint/no-misused-promises': 'error',             // pasar promises donde no corresponde
+      '@typescript-eslint/explicit-function-return-type': ['off'],
+      '@typescript-eslint/no-unused-vars': ['warn', { argsIgnorePattern: '^_' }], // ignorar _variables
+      '@typescript-eslint/consistent-type-imports': 'error',            // import type {} cuando corresponde
+      'no-console': 'warn',                                             // evitar console.log olvidados
+
+      // NestJS específico
+      '@typescript-eslint/no-extraneous-class': 'off',                  // NestJS usa clases vacías (módulos)
+      '@typescript-eslint/no-unsafe-member-access': 'off',              // decoradores de NestJS lo necesitan
+      '@typescript-eslint/no-unsafe-call': 'off',                       // ídem
+
+      '@typescript-eslint/naming-convention': ['warn', 
+        { selector: 'interface', format: ['PascalCase'] },
+        { selector: 'typeAlias', format: ['PascalCase'] },
+        { selector: 'enum', format: ['PascalCase'] },
+      ],
     },
   },
 );

src/app.controller.spec.ts

@@ -1,8 +1,9 @@
-import { Test, TestingModule } from '@nestjs/testing';
-import { AppController } from './app.controller';
-import { AppService } from './app.service';
+import type { TestingModule } from "@nestjs/testing";
+import { Test } from "@nestjs/testing";
+import { AppController } from "./app.controller";
+import { AppService } from "./app.service";
 
-describe('AppController', () => {
+describe("AppController", () => {
     let appController: AppController;
 
     beforeEach(async () => {
@@ -14,9 +15,9 @@ describe('AppController', () => {
         appController = app.get<AppController>(AppController);
     });
 
-  describe('root', () => {
+    describe("root", () => {
         it('should return "Hello World!"', () => {
-      expect(appController.getHello()).toBe('Hello World!');
+            expect(appController.getHello()).toBe("Hello World!");
         });
     });
 });

src/app.controller.ts

@@ -1,5 +1,5 @@
-import { Controller, Get } from '@nestjs/common';
-import { AppService } from './app.service';
+import { Controller, Get } from "@nestjs/common";
+import { AppService } from "./app.service";
 
 @Controller()
 export class AppController {

src/app.module.ts

@@ -1,8 +1,8 @@
-import { Module } from '@nestjs/common';
-import { AppController } from './app.controller';
-import { AppService } from './app.service';
-import { CategoriesModule } from './categories/categories.module';
-import { PrismaModule } from './prisma/prisma.module';
+import { Module } from "@nestjs/common";
+import { AppController } from "./app.controller";
+import { AppService } from "./app.service";
+import { CategoriesModule } from "./categories/categories.module";
+import { PrismaModule } from "./prisma/prisma.module";
 
 @Module({
     imports: [PrismaModule, CategoriesModule],

src/app.service.ts

@@ -1,8 +1,8 @@
-import { Injectable } from '@nestjs/common';
+import { Injectable } from "@nestjs/common";
 
 @Injectable()
 export class AppService {
     getHello(): string {
-    return 'Hello World!';
+        return "Hello World!";
     }
 }

src/categories/categories.controller.spec.ts

@@ -1,8 +1,9 @@
-import { Test, TestingModule } from '@nestjs/testing';
-import { CategoriesController } from './categories.controller';
-import { CategoriesService } from './categories.service';
+import type { TestingModule } from "@nestjs/testing";
+import { Test } from "@nestjs/testing";
+import { CategoriesController } from "./categories.controller";
+import { CategoriesService } from "./categories.service";
 
-describe('CategoriesController', () => {
+describe("CategoriesController", () => {
     let controller: CategoriesController;
 
     beforeEach(async () => {
@@ -14,7 +15,7 @@ describe('CategoriesController', () => {
         controller = module.get<CategoriesController>(CategoriesController);
     });
 
-  it('should be defined', () => {
+    it("should be defined", () => {
         expect(controller).toBeDefined();
     });
 });

src/categories/categories.controller.ts

@@ -1,9 +1,17 @@
-import { Controller, Get, Post, Body, Patch, Param, Delete } from '@nestjs/common';
-import { CategoriesService } from './categories.service';
-import { CreateCategoryDto } from './dto/create-category.dto';
-import { UpdateCategoryDto } from './dto/update-category.dto';
+import {
+    Controller,
+    Get,
+    Post,
+    Body,
+    Patch,
+    Param,
+    Delete,
+} from "@nestjs/common";
+import { CategoriesService } from "./categories.service";
+import { CreateCategoryDto } from "./dto/create-category.dto";
+import { UpdateCategoryDto } from "./dto/update-category.dto";
 
-@Controller('categories')
+@Controller("categories")
 export class CategoriesController {
     constructor(private readonly categoriesService: CategoriesService) {}
 
@@ -17,18 +25,21 @@ export class CategoriesController {
         return this.categoriesService.findAll();
     }
 
-  @Get(':id')
-  findOne(@Param('id') id: string) {
+    @Get(":id")
+    findOne(@Param("id") id: string) {
         return this.categoriesService.findOne(+id);
     }
 
-  @Patch(':id')
-  update(@Param('id') id: string, @Body() updateCategoryDto: UpdateCategoryDto) {
+    @Patch(":id")
+    update(
+        @Param("id") id: string,
+        @Body() updateCategoryDto: UpdateCategoryDto,
+    ) {
         return this.categoriesService.update(+id, updateCategoryDto);
     }
 
-  @Delete(':id')
-  remove(@Param('id') id: string) {
+    @Delete(":id")
+    remove(@Param("id") id: string) {
         return this.categoriesService.remove(+id);
     }
 }

src/categories/categories.module.ts

@@ -1,6 +1,6 @@
-import { Module } from '@nestjs/common';
-import { CategoriesService } from './categories.service';
-import { CategoriesController } from './categories.controller';
+import { Module } from "@nestjs/common";
+import { CategoriesService } from "./categories.service";
+import { CategoriesController } from "./categories.controller";
 
 @Module({
     controllers: [CategoriesController],

src/categories/categories.service.spec.ts

@@ -1,7 +1,8 @@
-import { Test, TestingModule } from '@nestjs/testing';
-import { CategoriesService } from './categories.service';
+import type { TestingModule } from "@nestjs/testing";
+import { Test } from "@nestjs/testing";
+import { CategoriesService } from "./categories.service";
 
-describe('CategoriesService', () => {
+describe("CategoriesService", () => {
     let service: CategoriesService;
 
     beforeEach(async () => {
@@ -12,7 +13,7 @@ describe('CategoriesService', () => {
         service = module.get<CategoriesService>(CategoriesService);
     });
 
-  it('should be defined', () => {
+    it("should be defined", () => {
         expect(service).toBeDefined();
     });
 });

src/categories/categories.service.ts

@@ -1,11 +1,11 @@
-import { Injectable } from '@nestjs/common';
-import { CreateCategoryDto } from './dto/create-category.dto';
-import { UpdateCategoryDto } from './dto/update-category.dto';
+import { Injectable } from "@nestjs/common";
+import { CreateCategoryDto } from "./dto/create-category.dto";
+import { UpdateCategoryDto } from "./dto/update-category.dto";
 
 @Injectable()
 export class CategoriesService {
     create(createCategoryDto: CreateCategoryDto) {
-    return 'This action adds a new category';
+        return "This action adds a new category";
     }
 
     findAll() {

src/categories/dto/update-category.dto.ts

@@ -1,4 +1,4 @@
-import { PartialType } from '@nestjs/mapped-types';
-import { CreateCategoryDto } from './create-category.dto';
+import { PartialType } from "@nestjs/mapped-types";
+import { CreateCategoryDto } from "./create-category.dto";
 
 export class UpdateCategoryDto extends PartialType(CreateCategoryDto) {}

src/main.ts

@@ -1,8 +1,8 @@
-import { NestFactory } from '@nestjs/core';
-import { AppModule } from './app.module';
+import { NestFactory } from "@nestjs/core";
+import { AppModule } from "./app.module";
 
 async function bootstrap() {
     const app = await NestFactory.create(AppModule);
     await app.listen(process.env.PORT ?? 3000);
 }
-bootstrap();
+void bootstrap();

src/prisma/prisma.module.ts

@@ -1,5 +1,5 @@
-import { Global, Module } from '@nestjs/common';
-import { PrismaService } from './prisma.service';
+import { Global, Module } from "@nestjs/common";
+import { PrismaService } from "./prisma.service";
 
 @Global()
 @Module({

src/prisma/prisma.service.ts

@@ -1,5 +1,5 @@
-import { Injectable, OnModuleInit } from '@nestjs/common';
-import { PrismaClient } from 'generated/prisma/client';
+import { Injectable, OnModuleInit } from "@nestjs/common";
+import { PrismaClient } from "generated/prisma/client";
 
 @Injectable()
 export class PrismaService extends PrismaClient implements OnModuleInit {

test/app.e2e-spec.ts

@@ -1,10 +1,11 @@
-import { Test, TestingModule } from '@nestjs/testing';
-import { INestApplication } from '@nestjs/common';
-import request from 'supertest';
-import { App } from 'supertest/types';
-import { AppModule } from './../src/app.module';
+import type { TestingModule } from "@nestjs/testing";
+import { Test } from "@nestjs/testing";
+import type { INestApplication } from "@nestjs/common";
+import request from "supertest";
+import type { App } from "supertest/types";
+import { AppModule } from "./../src/app.module";
 
-describe('AppController (e2e)', () => {
+describe("AppController (e2e)", () => {
     let app: INestApplication<App>;
 
     beforeEach(async () => {
@@ -16,10 +17,10 @@ describe('AppController (e2e)', () => {
         await app.init();
     });
 
-  it('/ (GET)', () => {
+    it("/ (GET)", () => {
         return request(app.getHttpServer())
-      .get('/')
+            .get("/")
             .expect(200)
-      .expect('Hello World!');
+            .expect("Hello World!");
     });
 });