tinybench 2.9.0: Bench suite creation and execution with tinybench

Clean-room public code sample — generation instructions

Write a brand-new, minimal, self-contained code sample in this clean-room directory.
Do not copy, paraphrase, or reference any existing project source. Work only from this spec.

A csx.json manifest scaffold already exists. Do not recreate it from memory. Preserve its case.goal, packages and symbols; fill its empty case.contract with exact assertions and correct its environment, commands and verifierAdapter for the files you generate.

Goal: Bench suite creation and execution with tinybench
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:npm/tinybench@2.9.0
Demonstrate these symbols/APIs:
  - Bench
  - Bench.prototype.add
  - Bench.prototype.run

Rules:
  - One focused purpose; the smallest project that proves the goal.
  - Include a contract test (test/contract.*) that runs OFFLINE and exits 0 exactly when the goal behavior works.
  - Pin every dependency with a lockfile so resolution is reproducible.
  - No secrets, credentials, or tokens. No real URLs (only example.com or localhost). No absolute paths.
  - No personal names, emails, company names, or project identifiers of any kind.
  - No binaries and no generated output (node_modules, dist, target, venv, .git, .env).
  - Keep it under 200 files and 256KB packed.

{"case":{"caseId":"case:sha256:62a2b8935a3a50256425d8b2d50e83eb39b7ab505818a2b4941e3ffd2e2845ee","contract":["Bench initializes benchmark instance with configurable execution options","Bench.prototype.add registers synchronous and asynchronous benchmark tasks returning the bench instance","Bench.prototype.run executes registered benchmark tasks and records timing metrics into task results","Bench.prototype.results returns an array containing the result of each benchmark task","Bench.prototype.table produces formatted tabular records summarizing benchmark task outcomes","Bench.prototype.getTask retrieves a registered benchmark task by name or undefined when not found","Bench.prototype.reset resets execution run counts and clears task results across all registered tasks"],"goal":"Bench suite creation and execution with tinybench","kind":"HOW","packages":["pkg:npm/tinybench@2.9.0"],"schemaVersion":1,"symbols":["Bench","Bench.prototype.add","Bench.prototype.run"]},"contractCommand":["node","test/contract.mjs"],"environment":{"arch":"x64","distro":"ubuntu","ecosystem":"npm","libc":"glibc","libcVersion":"2.39","os":"linux","osVersionBucket":"24","packageManager":"npm","schemaVersion":1},"license":"MIT-0","packages":["pkg:npm/tinybench@2.9.0"],"schemaVersion":1,"subject":"pkg:npm/tinybench@2.9.0","symbols":["Bench","Bench.prototype.add","Bench.prototype.run"],"verifierAdapter":"node-typescript@1"}

import { Bench } from 'tinybench';

/**
 * Creates and configures a new Bench instance with options.
 *
 * @param {import('tinybench').Options} [options] - Options for the Bench instance.
 * @returns {Bench} The configured Bench instance.
 */
export function createBench(options) {
  return new Bench(options);
}

export { Bench };
export default Bench;

{
  "name": "sample-tinybench",
  "version": "1.0.0",
  "lockfileVersion": 3,
  "requires": true,
  "packages": {
    "": {
      "name": "sample-tinybench",
      "version": "1.0.0",
      "license": "MIT-0",
      "dependencies": {
        "tinybench": "2.9.0"
      }
    },
    "node_modules/tinybench": {
      "version": "2.9.0",
      "resolved": "https://registry.npmjs.org/tinybench/-/tinybench-2.9.0.tgz",
      "integrity": "sha512-0+DUvqWMValLmha6lr4kD8iAMK1HzV0/aKnCtWb9v9641TnP/MFb7Pc2bxoxQjTXAErryXVgUOfv2YqNllqGeg==",
      "license": "MIT"
    }
  }
}

{
  "name": "sample-tinybench",
  "version": "1.0.0",
  "private": true,
  "type": "module",
  "main": "index.mjs",
  "scripts": {
    "test": "node test/contract.mjs"
  },
  "dependencies": {
    "tinybench": "2.9.0"
  },
  "license": "MIT-0"
}

{
  "schemaVersion": 1,
  "goal": "Bench suite creation and execution with tinybench",
  "kind": "HOW",
  "packages": [
    "pkg:npm/tinybench@2.9.0"
  ],
  "symbols": [
    "Bench",
    "Bench.prototype.add",
    "Bench.prototype.run"
  ]
}

import assert from 'node:assert/strict';
import { Bench, createBench } from '../index.mjs';

// 1. Bench initializes benchmark instance with configurable execution options
const bench = createBench({ time: 20, iterations: 2 });
assert.ok(bench instanceof Bench);
assert.equal(bench.time, 20);
assert.equal(bench.iterations, 2);

// 2. Bench.prototype.add registers synchronous and asynchronous benchmark tasks returning the bench instance
const chained = bench
  .add('sync-task', () => {
    let sum = 0;
    for (let i = 0; i < 50; i++) sum += i;
  })
  .add('async-task', async () => {
    await Promise.resolve(42);
  });
assert.equal(chained, bench);
assert.equal(bench.tasks.length, 2);
assert.equal(bench.tasks[0].name, 'sync-task');
assert.equal(bench.tasks[1].name, 'async-task');

// 3. Bench.prototype.run executes registered benchmark tasks and records timing metrics into task results
const tasks = await bench.run();
assert.equal(tasks.length, 2);
assert.equal(tasks[0].runs >= 1, true);
assert.ok(tasks[0].result);
assert.equal(typeof tasks[0].result.hz, 'number');
assert.equal(typeof tasks[0].result.mean, 'number');
assert.equal(typeof tasks[0].result.min, 'number');
assert.equal(typeof tasks[0].result.max, 'number');
assert.ok(Array.isArray(tasks[0].result.samples));

// 4. Bench.prototype.results returns an array containing the result of each benchmark task
const results = bench.results;
assert.equal(results.length, 2);
assert.equal(results[0], tasks[0].result);
assert.equal(results[1], tasks[1].result);

// 5. Bench.prototype.table produces formatted tabular records summarizing benchmark task outcomes
const table = bench.table();
assert.equal(table.length, 2);
assert.equal(table[0]['Task Name'], 'sync-task');
assert.equal(table[1]['Task Name'], 'async-task');

// 6. Bench.prototype.getTask retrieves a registered benchmark task by name or undefined when not found
assert.equal(bench.getTask('sync-task'), tasks[0]);
assert.equal(bench.getTask('async-task'), tasks[1]);
assert.equal(bench.getTask('nonexistent-task'), undefined);

// 7. Bench.prototype.reset resets execution run counts and clears task results across all registered tasks
bench.reset();
assert.equal(bench.tasks[0].runs, 0);
assert.equal(bench.tasks[0].result, undefined);
assert.equal(bench.tasks[1].runs, 0);
assert.equal(bench.tasks[1].result, undefined);

console.log('Contract test passed successfully.');