camelcase 5.3.1: Convert strings and string arrays to camelCase or PascalCase

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: Convert strings and string arrays to camelCase or PascalCase
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:npm/camelcase@5.3.1
Demonstrate these symbols/APIs:
  - camelCase

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:sha256:3ac507152b659fcf0ff40bc493bed2b16f73d0d38795adc4e4b5c6d6344f136b","contract":["camelCase converts hyphen-, underscore-, dot-, and space-separated strings into lowerCamelCase","camelCase joins an array of string fragments into a single camelCase string","camelCase transforms input into PascalCase when pascalCase option is set to true","camelCase preserves existing uppercase transitions within words","camelCase returns single character strings in lowercase or uppercase according to pascalCase option","camelCase returns empty string when input is empty string or empty array","camelCase throws TypeError when input is not a string or array of strings"],"goal":"Convert strings and string arrays to camelCase or PascalCase","kind":"HOW","packages":["pkg:npm/camelcase@5.3.1"],"schemaVersion":1,"symbols":["camelCase"]},"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/camelcase@5.3.1"],"schemaVersion":1,"subject":"pkg:npm/camelcase@5.3.1","symbols":["camelCase"],"verifierAdapter":"node-typescript@1"}

import camelcase from 'camelcase';

/**
 * Converts a string or array of strings to camelCase with optional PascalCase support.
 *
 * @param {string | string[]} input - String or array of strings to convert.
 * @param {object} [options] - Options for case conversion.
 * @param {boolean} [options.pascalCase=false] - Uppercase the first character.
 * @returns {string} CamelCase or PascalCase converted string.
 */
export function toCamelCase(input, options) {
  return camelcase(input, options);
}

export default camelcase;

{
  "name": "sample-camelcase",
  "version": "1.0.0",
  "lockfileVersion": 3,
  "requires": true,
  "packages": {
    "": {
      "name": "sample-camelcase",
      "version": "1.0.0",
      "license": "MIT-0",
      "dependencies": {
        "camelcase": "5.3.1"
      }
    },
    "node_modules/camelcase": {
      "version": "5.3.1",
      "resolved": "https://registry.npmjs.org/camelcase/-/camelcase-5.3.1.tgz",
      "integrity": "sha512-L28STB170nwWS63UjtlEOE3dldQApaJXZkOI1uMFfzf3rRuPegHaHesyee+YxQ+W6SvRDQV6UrdOdRiR153wJg==",
      "license": "MIT",
      "engines": {
        "node": ">=6"
      }
    }
  }
}

{
  "name": "sample-camelcase",
  "version": "1.0.0",
  "private": true,
  "type": "module",
  "main": "index.mjs",
  "scripts": {
    "test": "node test/contract.mjs"
  },
  "dependencies": {
    "camelcase": "5.3.1"
  },
  "license": "MIT-0"
}

{
  "schemaVersion": 1,
  "goal": "Convert strings and string arrays to camelCase or PascalCase",
  "kind": "HOW",
  "packages": [
    "pkg:npm/camelcase@5.3.1"
  ],
  "symbols": [
    "camelCase"
  ]
}

import assert from 'node:assert/strict';
import camelcase from 'camelcase';
import { toCamelCase } from '../index.mjs';

// 1. camelCase converts hyphen-, underscore-, dot-, and space-separated strings into lowerCamelCase
assert.equal(camelcase('foo-bar'), 'fooBar');
assert.equal(camelcase('foo_bar'), 'fooBar');
assert.equal(camelcase('foo.bar'), 'fooBar');
assert.equal(camelcase('foo bar'), 'fooBar');
assert.equal(camelcase('--foo-bar_baz.qux quux'), 'fooBarBazQuxQuux');
assert.equal(toCamelCase('hello-world_test.demo sample'), 'helloWorldTestDemoSample');

// 2. camelCase joins an array of string fragments into a single camelCase string
assert.equal(camelcase(['foo', 'bar', 'baz']), 'fooBarBaz');
assert.equal(camelcase(['__foo__', '--bar']), 'fooBar');
assert.equal(toCamelCase(['user', 'profile', 'data']), 'userProfileData');

// 3. camelCase transforms input into PascalCase when pascalCase option is set to true
assert.equal(camelcase('foo-bar', { pascalCase: true }), 'FooBar');
assert.equal(camelcase(['foo', 'bar'], { pascalCase: true }), 'FooBar');
assert.equal(toCamelCase('user-account', { pascalCase: true }), 'UserAccount');

// 4. camelCase preserves existing uppercase transitions within words
assert.equal(camelcase('fooBar'), 'fooBar');
assert.equal(camelcase('FooBar'), 'fooBar');
assert.equal(camelcase('FooBar', { pascalCase: true }), 'FooBar');
assert.equal(toCamelCase('XMLHttpRequest'), 'xmlHttpRequest');

// 5. camelCase returns single character strings in lowercase or uppercase according to pascalCase option
assert.equal(camelcase('a'), 'a');
assert.equal(camelcase('A'), 'a');
assert.equal(camelcase('a', { pascalCase: true }), 'A');
assert.equal(camelcase('A', { pascalCase: true }), 'A');
assert.equal(toCamelCase('x'), 'x');
assert.equal(toCamelCase('x', { pascalCase: true }), 'X');

// 6. camelCase returns empty string when input is empty string or empty array
assert.equal(camelcase(''), '');
assert.equal(camelcase([]), '');
assert.equal(camelcase(['', '  ']), '');
assert.equal(toCamelCase(''), '');

// 7. camelCase throws TypeError when input is not a string or array of strings
assert.throws(() => camelcase(123), { name: 'TypeError' });
assert.throws(() => camelcase(null), { name: 'TypeError' });
assert.throws(() => camelcase(undefined), { name: 'TypeError' });
assert.throws(() => camelcase({}), { name: 'TypeError' });
assert.throws(() => toCamelCase(456), { name: 'TypeError' });

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