fix formatting

Author: charliesbot

typescript/.prettierrc

@@ -0,0 +1,6 @@
+{
+  "singleQuote": true,
+  "trailingComma": "all",
+  "bracketSpacing": false,
+  "arrowParens": "avoid"
+}

typescript/README.md

@@ -4,7 +4,8 @@ This workspace is configured for solving LeetCode problems in TypeScript.
 
 ## Setup
 - **Vitest** for testing and test runner
-- **Biome** for fast linting and formatting  
+- **ESLint** with TypeScript support for code quality
+- **Prettier** for consistent code formatting
 - **TypeScript** for type safety and modern JavaScript features
 
 ## Prerequisites
@@ -73,6 +74,8 @@ npx vitest
 npx tsc --noEmit
 
 # Lint and format code
-npm run lint
-npm run format
+npm run lint          # Check for linting issues
+npm run lint:fix      # Fix linting issues automatically
+npm run format        # Format code with Prettier
+npm run format:check  # Check if code is formatted
 ```

typescript/biome.json

@@ -5,13 +5,20 @@
   "type": "module",
   "scripts": {
     "test": "vitest run",
-    "lint": "biome check .",
-    "format": "biome format --write ."
+    "lint": "eslint . --ext .ts",
+    "lint:fix": "eslint . --ext .ts --fix",
+    "format": "prettier --write .",
+    "format:check": "prettier --check ."
   },
   "devDependencies": {
     "@types/node": "^24.1.0",
+    "@typescript-eslint/eslint-plugin": "^8.0.0",
+    "@typescript-eslint/parser": "^8.0.0",
+    "eslint": "^9.0.0",
+    "eslint-config-prettier": "^9.0.0",
+    "eslint-plugin-prettier": "^5.0.0",
+    "prettier": "^3.0.0",
     "typescript": "^5.8.3",
-    "@biomejs/biome": "^1.9.4",
     "vitest": "^1.0.0"
   }
 }

typescript/package.json

@@ -47,5 +47,4 @@ const threeSum = (nums: number[]) => {
 };
 
 const testInput = [-2, 0, 0, 2, 2];
-// const input = [-1,0,1,2,-1,-4];
 threeSum(testInput);

typescript/problem_0015/3Sum.ts

@@ -1,15 +1,19 @@
 {
-  "compilerOptions": {
-    "target": "ES2022",
-    "module": "ES2022",
-    "moduleResolution": "node",
-    "allowImportingTsExtensions": true,
-    "noEmit": true,
-    "esModuleInterop": true,
-    "strict": true,
-    "skipLibCheck": true,
-    "forceConsistentCasingInFileNames": true
-  },
-  "include": ["**/*.ts"],
-  "exclude": ["node_modules"]
+	"compilerOptions": {
+		"target": "ES2022",
+		"module": "ES2022",
+		"moduleResolution": "node",
+		"allowImportingTsExtensions": true,
+		"noEmit": true,
+		"esModuleInterop": true,
+		"strict": true,
+		"skipLibCheck": true,
+		"forceConsistentCasingInFileNames": true
+	},
+	"include": [
+		"**/*.ts"
+	],
+	"exclude": [
+		"node_modules"
+	]
 }