Improve and fix formatter, linter and test suite

.prettierrc

@@ -4,9 +4,8 @@
   "tabWidth": 2,
   "singleQuote": true,
   "trailingComma": "none",
-  "jsxBracketSameLine": true,
+  "bracketSameLine": true,
   "bracketSpacing": true,
   "arrowParens": "avoid",
   "printWidth": 120
 }
-

README.md

@@ -51,29 +51,26 @@ yarn
   ```
 
 ## IntelliJ IDEA Setup
-- Adjust node version: `Preferences` -> `Languages & Frameworks` -> `Node.js and NPM` and set the `Node interpreter` to the path of your Node.js installation.
-  - Configure jest: `Run/debug configurations` -> `Add new configuration` -> `Jest` and set the `Jest package` to the path of your `jest` installation.'
 
-    ![jestconfig.png](Intellij_Jest_config.png)
+- Adjust node version: `Preferences` -> `Languages & Frameworks` -> `Node.js and NPM` and set the `Node interpreter` to the path of your Node.js installation.
 
 ## Scripts
 
-| Command           | Description                        |
-|-------------------|------------------------------------|
-| `yarn test`       | Run all tests.                     |
-| `yarn test:watch` | Run tests in watch mode.           |
-| `yarn lint`       | Check for linting issues.          |
-| `yarn lint --fix` | Fix linting issues automatically.  |
+| Command           | Description                       |
+| ----------------- | --------------------------------- |
+| `yarn test`       | Run all tests.                    |
+| `yarn test:watch` | Run tests in watch mode.          |
+| `yarn lint`       | Check for linting issues.         |
+| `yarn lint --fix` | Fix linting issues automatically. |
 
 ## Folder Structure
 
 ```
 tdd-ts/
 ├── src/                # Source code
 ├── test/               # Test files
-├── .eslintignore       # Files to ignore during linting
 ├── eslint.config.js    # ESLint configuration
-├── jest-config.json    # Jest configuration
+├── jest.config.json    # Jest configuration
 ├── tsconfig.json       # TypeScript configuration
 ├── package.json        # Project metadata and scripts
 └── README.md           # Documentation

eslint.config.js

@@ -1,7 +1,17 @@
-import eslint from '@eslint/js';
-import tseslint from 'typescript-eslint';
+import eslint from '@eslint/js'
+import tseslint from 'typescript-eslint'
+import prettier from 'eslint-config-prettier'
+import jest from 'eslint-plugin-jest'
 
 export default tseslint.config(
   eslint.configs.recommended,
   tseslint.configs.recommended,
-);
+  {
+    files: ['test/**'],
+    ...jest.configs['flat/recommended'],
+    rules: {
+      ...jest.configs['flat/recommended'].rules
+    }
+  },
+  prettier
+)

package.json

@@ -16,21 +16,18 @@
     "@eslint/js": "^9.16.0",
     "@types/jest": "^29.5.4",
     "@types/node": "^20.8.6",
-    "@typescript-eslint/eslint-plugin": "^8.16.0",
-    "@typescript-eslint/parser": "^8.16.0",
     "eslint": "^9.16.0",
-    "eslint-config-prettier": "^9.0.0",
-    "eslint-plugin-jest": "^27.9.0",
-    "eslint-plugin-prettier": "^5.0.0",
+    "eslint-config-prettier": "^9.1.0",
+    "eslint-plugin-jest": "^28.9.0",
     "jest": "^29.7.0",
     "prettier": "^3.0.3",
-    "ts-jest": "^29.1.1",
+    "ts-jest": "^29.2.5",
     "typescript": "^5.7.2",
     "typescript-eslint": "^8.18.0"
   },
   "scripts": {
     "lint": "eslint .",
-    "test": "jest -c jest-config.json",
-    "test:watch": "jest -c jest-config.json --watch"
+    "test": "jest",
+    "test:watch": "jest --watch"
   }
 }

src/calculator.ts

@@ -1,9 +1,9 @@
 export default class Calculator {
-    add(number1: number, number2: number): number {
-        return 0
-    }
+  add(number1: number, number2: number): number {
+    return 0
+  }
 
-    multiply(number1: number, number2: number): number {
-        return 0
-    }
+  multiply(number1: number, number2: number): number {
+    return 0
+  }
 }

test/calculator.test.ts

@@ -1,13 +1,13 @@
 import Calculator from '../src/calculator'
 
 describe('Calculator', () => {
-    const calculator = new Calculator()
+  const calculator = new Calculator()
 
-    it('should add two numbers', () => {
-        expect(calculator.add(1, 2)).toEqual(3)
-    })
+  it('should add two numbers', () => {
+    expect(calculator.add(1, 2)).toEqual(3)
+  })
 
-    it('should multiply two numbers', () => {
-        expect(calculator.multiply(1, 2)).toEqual(2)
-    })
+  it('should multiply two numbers', () => {
+    expect(calculator.multiply(1, 2)).toEqual(2)
+  })
 })