chore(codestyle): Setup eslint deps, rules and fix violations

hyperfine --warmup 5 --prepare "nx reset && nx clear-cache" \
                    --runs 100 "nx run-many -t lint"
  Time (mean ± σ):    2.686s ±  0.044s  [User: 3.278s, System: 0.222s]
  Range (min … max):  2.594s …  2.818s  100 runs

hyperfine --warmup 5 --prepare "nx reset && nx clear-cache" \
                    --runs 100 "nx run-many -t build"
  Time (mean ± σ):    2.254s ±  0.019s  [User: 2.561s, System: 0.213s]
  Range (min … max):  2.229s …  2.372s  100 runs

hyperfine --warmup 5 --prepare "nx reset && nx clear-cache" \
                    --runs 100 "nx run-many -t test"
  Time (mean ± σ):    1.636s ±  0.007s  [User: 0.784s, System: 0.134s]
  Range (min … max):  1.611s …  1.659s  100 runs

More:
- https://nx.dev/recipes/tips-n-tricks/eslint

.eslintrc.yml

@@ -1,8 +1,36 @@
 root: true
+env:
+  es2021: true
+  node: true
+  browser: true
 ignorePatterns:
   - '**/*'
 plugins:
   - '@nx'
+  - eslint-comments
+extends:
+  - eslint:recommended
+  - plugin:eslint-comments/recommended
+  - plugin:promise/recommended
+  - plugin:import/recommended
+  - plugin:prettier/recommended
+rules:
+  import/first: error
+  import/no-duplicates: error
+  import/no-self-import: error
+  import/no-absolute-path: error
+  import/no-named-default: error
+  import/order:
+    - error
+    - groups:
+        - builtin
+        - external
+        - internal
+      newlines-between: never
+      alphabetize:
+        order: asc
+        caseInsensitive: false
+
 overrides:
   - files:
       - '*.ts'
@@ -21,9 +49,24 @@ overrides:
   - files:
       - '*.ts'
       - '*.tsx'
+    parser: '@typescript-eslint/parser'
+    parserOptions:
+      ecmaVersion: latest
+      sourceType: module
+      project: tsconfig.*?.json
     extends:
       - plugin:@nx/typescript
-    rules: {}
+      - plugin:@typescript-eslint/recommended
+      - plugin:import/typescript
+      - xo
+      - xo-typescript/space
+    rules:
+      new-cap: off
+      semi: off
+      '@typescript-eslint/semi': off
+      '@typescript-eslint/comma-dangle': off
+      '@typescript-eslint/object-curly-spacing': off
+      '@typescript-eslint/require-await': error
   - files:
       - '*.js'
       - '*.jsx'
@@ -35,6 +78,11 @@ overrides:
       - '*.spec.tsx'
       - '*.spec.js'
       - '*.spec.jsx'
+    extends:
+      - plugin:jest/style
+      - plugin:jest/recommended
+      - plugin:jest-formatting/recommended
     env:
       jest: true
+      jest/globals: true
     rules: {}

apps/app/src/app/app.controller.spec.ts

@@ -1,22 +1,21 @@
-import { Test, TestingModule } from '@nestjs/testing';
-
-import { AppController } from './app.controller';
-import { AppService } from './app.service';
+import { Test, type TestingModule } from '@nestjs/testing'
+import { AppController } from './app.controller'
+import { AppService } from './app.service'
 
 describe('AppController', () => {
-  let app: TestingModule;
+  let app: TestingModule
 
   beforeAll(async () => {
     app = await Test.createTestingModule({
       controllers: [AppController],
-      providers: [AppService],
-    }).compile();
-  });
+      providers: [AppService]
+    }).compile()
+  })
 
   describe('getData', () => {
     it('should return "Hello API"', () => {
-      const appController = app.get<AppController>(AppController);
-      expect(appController.getData()).toEqual({ message: 'Hello API' });
-    });
-  });
-});
+      const appController = app.get(AppController)
+      expect(appController.getData()).toEqual({ message: 'Hello API' })
+    })
+  })
+})

apps/app/src/app/app.controller.ts

@@ -1,13 +1,12 @@
-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 {
   constructor(private readonly appService: AppService) {}
 
   @Get()
   getData() {
-    return this.appService.getData();
+    return this.appService.getData()
   }
 }

apps/app/src/app/app.module.ts

@@ -1,11 +1,10 @@
-import { Module } from '@nestjs/common';
-
-import { AppController } from './app.controller';
-import { AppService } from './app.service';
+import { Module } from '@nestjs/common'
+import { AppController } from './app.controller'
+import { AppService } from './app.service'
 
 @Module({
   imports: [],
   controllers: [AppController],
-  providers: [AppService],
+  providers: [AppService]
 })
 export class AppModule {}

apps/app/src/app/app.service.spec.ts

@@ -1,21 +1,20 @@
-import { Test } from '@nestjs/testing';
-
-import { AppService } from './app.service';
+import { Test } from '@nestjs/testing'
+import { AppService } from './app.service'
 
 describe('AppService', () => {
-  let service: AppService;
+  let service: AppService
 
   beforeAll(async () => {
     const app = await Test.createTestingModule({
-      providers: [AppService],
-    }).compile();
+      providers: [AppService]
+    }).compile()
 
-    service = app.get<AppService>(AppService);
-  });
+    service = app.get<AppService>(AppService)
+  })
 
   describe('getData', () => {
     it('should return "Hello API"', () => {
-      expect(service.getData()).toEqual({ message: 'Hello API' });
-    });
-  });
-});
+      expect(service.getData()).toEqual({ message: 'Hello API' })
+    })
+  })
+})

apps/app/src/app/app.service.ts

@@ -1,8 +1,8 @@
-import { Injectable } from '@nestjs/common';
+import { Injectable } from '@nestjs/common'
 
 @Injectable()
 export class AppService {
   getData(): { message: string } {
-    return { message: 'Hello API' };
+    return { message: 'Hello API' }
   }
 }

apps/app/src/main.ts

@@ -1,22 +1,16 @@
-/**
- * This is not a production server yet!
- * This is only a minimal backend to get started.
- */
-
-import { Logger } from '@nestjs/common';
-import { NestFactory } from '@nestjs/core';
-
-import { AppModule } from './app/app.module';
+import { Logger } from '@nestjs/common'
+import { NestFactory } from '@nestjs/core'
+import { AppModule } from './app/app.module'
 
 async function bootstrap() {
-  const app = await NestFactory.create(AppModule);
-  const globalPrefix = 'api';
-  app.setGlobalPrefix(globalPrefix);
-  const port = process.env.PORT || 3000;
-  await app.listen(port);
+  const app = await NestFactory.create(AppModule)
+  const globalPrefix = 'api'
+  app.setGlobalPrefix(globalPrefix)
+  const port = process.env.PORT ?? 3000
+  await app.listen(port)
   Logger.log(
     `🚀 Application is running on: http://localhost:${port}/${globalPrefix}`
-  );
+  )
 }
 
-bootstrap();
+bootstrap().then(console.log).catch(console.error)

apps/app/webpack.config.js

@@ -1,9 +1,9 @@
-const { NxAppWebpackPlugin } = require('@nx/webpack/app-plugin');
-const { join } = require('path');
+const { join } = require('path')
+const { NxAppWebpackPlugin } = require('@nx/webpack/app-plugin')
 
 module.exports = {
   output: {
-    path: join(__dirname, '../../dist/apps/app'),
+    path: join(__dirname, '../../dist/apps/app')
   },
   plugins: [
     new NxAppWebpackPlugin({
@@ -13,7 +13,7 @@ module.exports = {
       tsConfig: './tsconfig.app.json',
       assets: ['./src/assets'],
       optimization: false,
-      outputHashing: 'none',
-    }),
-  ],
-};
+      outputHashing: 'none'
+    })
+  ]
+}

package.json

@@ -42,6 +42,14 @@
     "@typescript-eslint/parser": "^7.12.0",
     "eslint": "~9.4.0",
     "eslint-config-prettier": "^9.1.0",
+    "eslint-config-xo": "^0.45.0",
+    "eslint-config-xo-typescript": "^4.0.0",
+    "eslint-plugin-eslint-comments": "^3.2.0",
+    "eslint-plugin-import": "^2.29.1",
+    "eslint-plugin-jest": "^28.5.0",
+    "eslint-plugin-jest-formatting": "^3.1.0",
+    "eslint-plugin-prettier": "^5.1.3",
+    "eslint-plugin-promise": "^6.2.0",
     "jest": "^29.7.0",
     "jest-environment-node": "^29.7.0",
     "nx": "19.1.2",

tsconfig.base.json

@@ -13,6 +13,7 @@
     "lib": ["es2020", "dom"],
     "skipLibCheck": true,
     "skipDefaultLibCheck": true,
+    "strictNullChecks": true,
     "baseUrl": ".",
     "paths": {}
   },