Add Biome for linting and formatting

.github/workflows/ci.yml

@@ -9,6 +9,18 @@ permissions:
   contents: read
 
 jobs:
+  lint:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+
+      - uses: actions/setup-node@v4
+        with:
+          node-version-file: '.nvmrc'
+
+      - run: npm ci
+      - run: npm run lint
+
   build:
     strategy:
       fail-fast: false

biome.json

@@ -0,0 +1,35 @@
+{
+  "$schema": "https://biomejs.dev/schemas/2.5.9/schema.json",
+  "vcs": {
+    "enabled": true,
+    "clientKind": "git",
+    "useIgnoreFile": true
+  },
+  "files": {
+    "includes": ["**", "!!**/dist", "!!tsconfig.json", "!!package-lock.json"]
+  },
+  "formatter": {
+    "enabled": true,
+    "indentStyle": "space",
+    "indentWidth": 2
+  },
+  "linter": {
+    "enabled": true,
+    "rules": {
+      "preset": "recommended"
+    }
+  },
+  "javascript": {
+    "formatter": {
+      "quoteStyle": "single"
+    }
+  },
+  "assist": {
+    "enabled": true,
+    "actions": {
+      "source": {
+        "organizeImports": "on"
+      }
+    }
+  }
+}

build-bundle.js

@@ -1,12 +1,14 @@
 const esbuild = require('esbuild');
 
-esbuild.build({
-  entryPoints: ['hello.ts'],
-  bundle: true,
-  outfile: 'dist/bundled/bundle.js',
-  platform: 'node',
-  target: 'node24',
-  format: 'cjs',
-  sourcemap: true,
-  minify: true,
-}).catch(() => process.exit(1));
+esbuild
+  .build({
+    entryPoints: ['hello.ts'],
+    bundle: true,
+    outfile: 'dist/bundled/bundle.js',
+    platform: 'node',
+    target: 'node24',
+    format: 'cjs',
+    sourcemap: true,
+    minify: true,
+  })
+  .catch(() => process.exit(1));

build-sea.js

@@ -1,5 +1,5 @@
-const { execSync } = require('child_process');
-const fs = require('fs');
+const { execSync } = require('node:child_process');
+const fs = require('node:fs');
 
 // Ensure the bundle exists
 if (!fs.existsSync('./dist/bundled/bundle.js')) {
@@ -14,10 +14,14 @@ fs.mkdirSync('dist', { recursive: true });
 console.log('Building SEA binary (node --build-sea)...');
 try {
   execSync('node --build-sea sea-config.json', { stdio: 'inherit' });
-} catch (error) {
+} catch {
   console.error('\nFailed to build the SEA binary.');
-  console.error(`node --build-sea requires Node.js 25.5+ — you are running ${process.version}.`);
-  console.error('As of this writing it only ships on the Node 26 "Current" release line (not yet backported to the 24 LTS line). Switch with: nvm install 26 && nvm use 26');
+  console.error(
+    `node --build-sea requires Node.js 25.5+ — you are running ${process.version}.`,
+  );
+  console.error(
+    'As of this writing it only ships on the Node 26 "Current" release line (not yet backported to the 24 LTS line). Switch with: nvm install 26 && nvm use 26',
+  );
   process.exit(1);
 }
 
@@ -43,8 +47,12 @@ if (process.platform === 'darwin') {
     process.exit(1);
   }
 } else if (process.platform === 'win32') {
-  console.log(`On Windows, sign ${outputPath} yourself if you need a trusted binary:`);
+  console.log(
+    `On Windows, sign ${outputPath} yourself if you need a trusted binary:`,
+  );
   console.log(`  signtool sign /fd SHA256 ${outputPath}`);
 }
 
-console.log(`SEA binary creation complete! The executable is ready: ./${outputPath}`);
+console.log(
+  `SEA binary creation complete! The executable is ready: ./${outputPath}`,
+);

hello.ts

@@ -1,5 +1,5 @@
 import { Command } from 'commander';
-import { Greeter } from './lib/greeter';
+import { sayHello } from './lib/greeter';
 
 const program = new Command();
 
@@ -8,7 +8,7 @@ program
   .description('A simple greeting command')
   .argument('<name>', 'name to greet')
   .action((name: string) => {
-    Greeter.sayHello(name);
+    sayHello(name);
   });
 
-program.parse();
+program.parse();

lib/greeter.test.ts

@@ -1,14 +1,14 @@
-import { test } from 'node:test';
 import assert from 'node:assert/strict';
-import { Greeter } from './greeter';
+import { test } from 'node:test';
+import { sayHello } from './greeter';
 
 test('sayHello prints a greeting with the given name', () => {
   const lines: string[] = [];
   const originalLog = console.log;
   console.log = (line: string) => lines.push(line);
 
   try {
-    Greeter.sayHello('World');
+    sayHello('World');
   } finally {
     console.log = originalLog;
   }
@@ -23,7 +23,7 @@ test('sayHello reflects the name back verbatim', () => {
   console.log = (line: string) => lines.push(line);
 
   try {
-    Greeter.sayHello('Node 26');
+    sayHello('Node 26');
   } finally {
     console.log = originalLog;
   }

lib/greeter.ts

@@ -1,6 +1,3 @@
-// Utility class for greeting functionality
-export class Greeter {
-    static sayHello(name: string): void {
-        console.log(`Hello, ${name}!`);
-    }
-}
+export function sayHello(name: string): void {
+  console.log(`Hello, ${name}!`);
+}

package.json

@@ -10,9 +10,17 @@
     "build:js": "tsc",
     "build:bundle": "node build-bundle.js",
     "build:sea": "node build-sea.js",
-    "build:all": "npm run clean && npm run build:js && npm run build:bundle && npm run build:sea"
+    "build:all": "npm run clean && npm run build:js && npm run build:bundle && npm run build:sea",
+    "lint": "biome check .",
+    "format": "biome check --write ."
   },
-  "keywords": ["node", "sea", "single-executable-application", "typescript", "esbuild"],
+  "keywords": [
+    "node",
+    "sea",
+    "single-executable-application",
+    "typescript",
+    "esbuild"
+  ],
   "author": "Hamdi LAADHARI",
   "license": "ISC",
   "type": "commonjs",
@@ -28,6 +36,7 @@
     "node": ">=26.0.0"
   },
   "devDependencies": {
+    "@biomejs/biome": "^2.5.9",
     "@types/node": "^24.13.3",
     "commander": "^15.0.0",
     "esbuild": "^0.28.2",