chore: add benchmark framework with tatami-ng

Author: claude

benchmarks/index.bench.ts

@@ -0,0 +1,103 @@
+#!/usr/bin/env node --import tsx
+/**
+ * CLI Progress Reporting Benchmarks
+ *
+ * Measures performance of core operations using tatami-ng for statistical rigor.
+ *
+ * Run: npm run bench
+ *
+ * See: /docs/BENCHMARKING_STANDARDS.md
+ */
+
+import { bench, baseline, group, run } from 'tatami-ng';
+import { ProgressReporter, ProgressState } from '../src/index.ts';
+import { mkdtempSync, rmSync } from 'node:fs';
+import { tmpdir } from 'node:os';
+import { join } from 'node:path';
+
+// Prevent dead code elimination
+let result: ProgressReporter | ProgressState | undefined;
+let tempDir: string;
+
+// Setup/teardown
+function setup() {
+  tempDir = mkdtempSync(join(tmpdir(), 'prog-bench-'));
+}
+
+function teardown() {
+  if (tempDir) {
+    rmSync(tempDir, { recursive: true, force: true });
+  }
+}
+
+// ============================================================================
+// Core Operations Benchmarks
+// ============================================================================
+
+group('Progress Reporter Creation', () => {
+  setup();
+
+  baseline('create: basic reporter', () => {
+    result = new ProgressReporter({
+      total: 100,
+      stateDir: tempDir,
+    });
+  });
+
+  bench('create: with custom message', () => {
+    result = new ProgressReporter({
+      total: 100,
+      message: 'Processing files',
+      stateDir: tempDir,
+    });
+  });
+
+  teardown();
+});
+
+group('Progress Updates', () => {
+  setup();
+  const reporter = new ProgressReporter({
+    total: 1000,
+    stateDir: tempDir,
+  });
+
+  baseline('update: increment', () => {
+    reporter.increment();
+  });
+
+  bench('update: set progress', () => {
+    reporter.setProgress(500);
+  });
+
+  bench('update: with message', () => {
+    reporter.setMessage('Step 500 of 1000');
+  });
+
+  teardown();
+});
+
+group('State Reading', () => {
+  setup();
+  const reporter = new ProgressReporter({
+    total: 100,
+    stateDir: tempDir,
+  });
+  reporter.setProgress(50);
+
+  baseline('read: get state', () => {
+    result = reporter.getState();
+  });
+
+  teardown();
+});
+
+// ============================================================================
+// Run Benchmarks
+// ============================================================================
+
+await run({
+  units: false,
+  silent: false,
+  json: false,
+});

package.json

@@ -16,6 +16,7 @@
     "test:filesystem": "node --import tsx --test test/filesystem.test.ts",
     "test:fuzzy": "node --import tsx --test test/fuzzy.test.ts",
     "test:watch": "node --import tsx --test --watch test/index.test.ts test/cli.test.ts test/filesystem.test.ts test/fuzzy.test.ts",
+    "bench": "node --import tsx benchmarks/index.bench.ts",
     "dogfood": "npm run dogfood:flaky",
     "dogfood:flaky": "flaky --test 'npm test' --runs 10"
   },
@@ -42,6 +43,7 @@
   "devDependencies": {
     "@tuulbelt/test-flakiness-detector": "git+https://github.com/tuulbelt/test-flakiness-detector.git",
     "@types/node": "^20.19.27",
+    "tatami-ng": "^0.8.0",
     "tsx": "^4.7.0",
     "typescript": "^5.3.0"
   }