nanoid 3.3.16: nanoid

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: verify nanoid.nanoid in pkg:npm/nanoid@3.3.16
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:npm/nanoid@3.3.16
Demonstrate these symbols/APIs:
  - nanoid.nanoid

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:f23e569cbb197397ae8e6e7028d32366446a965ea414f9676e21449f78b3afea","contract":["nanoid generates a 21-character URL-friendly unique string by default","nanoid accepts a custom size parameter to specify the length of the generated string","nanoid generates unique IDs across multiple invocations without collision"],"goal":"verify nanoid.nanoid in pkg:npm/nanoid@3.3.16","kind":"HOW","packages":["pkg:npm/nanoid@3.3.16"],"schemaVersion":1,"symbols":["nanoid.nanoid"]},"contractCommand":["node","test/contract.cjs"],"environment":{"arch":"x64","distro":"ubuntu","ecosystem":"npm","executionContext":"node","language":"javascript","libc":"glibc","libcVersion":"2.39","moduleSystem":"cjs","os":"linux","osVersionBucket":"24","packageManager":"npm","packageManagerVersion":"10.9.8","runtime":"node","runtimeVersion":"22.23.2","schemaVersion":1},"license":"MIT-0","packages":["pkg:npm/nanoid@3.3.16"],"schemaVersion":1,"subject":"pkg:npm/nanoid@3.3.16","symbols":["nanoid.nanoid"],"verifierAdapter":"node-typescript@1"}

'use strict';

const { nanoid } = require('nanoid');

/**
 * Generates a random unique ID with default length (21).
 * @returns {string} Generated ID string.
 */
function generateId() {
  return nanoid();
}

/**
 * Generates a random unique ID with a specified length.
 * @param {number} size - Length of the generated ID.
 * @returns {string} Generated ID string.
 */
function generateIdWithSize(size) {
  return nanoid(size);
}

module.exports = {
  nanoid,
  generateId,
  generateIdWithSize
};

{
  "name": "sample-nanoid-nanoid",
  "version": "1.0.0",
  "lockfileVersion": 3,
  "requires": true,
  "packages": {
    "": {
      "name": "sample-nanoid-nanoid",
      "version": "1.0.0",
      "license": "MIT-0",
      "dependencies": {
        "nanoid": "3.3.16"
      }
    },
    "node_modules/nanoid": {
      "version": "3.3.16",
      "resolved": "https://registry.npmjs.org/nanoid/-/nanoid-3.3.16.tgz",
      "integrity": "sha512-bzlKTyNJ7+LdGIIwy8ijFpIqEQIvafahV7eYykJ8Cvh42EdJeODoJ6gUJXpQJvej1BddH8OqTXZNE/KfbWAu8Q==",
      "funding": [
        {
          "type": "github",
          "url": "https://github.com/sponsors/ai"
        }
      ],
      "license": "MIT",
      "bin": {
        "nanoid": "bin/nanoid.cjs"
      },
      "engines": {
        "node": "^10 || ^12 || ^13.7 || ^14 || >=15.0.1"
      }
    }
  }
}

{
  "name": "sample-nanoid-nanoid",
  "version": "1.0.0",
  "private": true,
  "description": "verify nanoid.nanoid in pkg:npm/nanoid@3.3.16",
  "main": "index.js",
  "scripts": {
    "test": "node test/contract.cjs"
  },
  "dependencies": {
    "nanoid": "3.3.16"
  },
  "license": "MIT-0"
}

{
  "schemaVersion": 1,
  "goal": "verify nanoid.nanoid in pkg:npm/nanoid@3.3.16",
  "kind": "HOW",
  "packages": [
    "pkg:npm/nanoid@3.3.16"
  ],
  "symbols": [
    "nanoid.nanoid"
  ]
}

'use strict';

const assert = require('assert');
const { nanoid } = require('nanoid');
const { generateId, generateIdWithSize } = require('../index.js');

function testNanoidDefault() {
  const id = nanoid();
  assert.strictEqual(typeof id, 'string', 'nanoid() should return a string');
  assert.strictEqual(id.length, 21, 'Default nanoid length should be 21');
  assert.match(id, /^[A-Za-z0-9_-]{21}$/, 'nanoid should match URL-safe characters pattern');
}

function testNanoidCustomSize() {
  const sizes = [1, 5, 10, 16, 32, 64];
  for (const size of sizes) {
    const id = nanoid(size);
    assert.strictEqual(typeof id, 'string', `nanoid(${size}) should return a string`);
    assert.strictEqual(id.length, size, `nanoid(${size}) length should be ${size}`);
    assert.match(id, /^[A-Za-z0-9_-]+$/, `nanoid(${size}) should match URL-safe pattern`);
  }
}

function testNanoidUniqueness() {
  const seen = new Set();
  const iterations = 500;

  for (let i = 0; i < iterations; i++) {
    const id = nanoid();
    assert.strictEqual(id.length, 21, 'Default ID length must be 21');
    assert.strictEqual(seen.has(id), false, `Collision detected for ID: ${id}`);
    seen.add(id);
  }

  assert.strictEqual(seen.size, iterations, 'All generated default IDs must be unique');
}

function testHelpers() {
  const id1 = generateId();
  assert.strictEqual(typeof id1, 'string', 'generateId should return a string');
  assert.strictEqual(id1.length, 21, 'generateId default length should be 21');
  assert.match(id1, /^[A-Za-z0-9_-]{21}$/, 'generateId should return valid URL-safe string');

  const id2 = generateIdWithSize(12);
  assert.strictEqual(typeof id2, 'string', 'generateIdWithSize should return a string');
  assert.strictEqual(id2.length, 12, 'generateIdWithSize should produce ID of requested length');
  assert.match(id2, /^[A-Za-z0-9_-]{12}$/, 'generateIdWithSize should match URL-safe pattern');
}

function runAll() {
  testNanoidDefault();
  testNanoidCustomSize();
  testNanoidUniqueness();
  testHelpers();
  console.log('Contract tests passed successfully.');
}

try {
  runAll();
  process.exit(0);
} catch (err) {
  console.error('Contract test failed:', err);
  process.exit(1);
}