camelcase 6.3.0: Convert strings to camelCase or PascalCase with configurable uppercase preservation and locale support

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 to camelCase or PascalCase with configurable uppercase preservation and locale support
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:npm/camelcase@6.3.0
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:sha256:2bfa567072afa0d13d55189b12e350ecd0e436f8a7bef5c88dbffa326eca9421","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 consecutive uppercase abbreviations when preserveConsecutiveUppercase is set to true","camelcase applies locale-specific case mappings when locale is specified","camelcase falls back to Unicode default case conversion when locale is set to false","camelcase throws TypeError when input is not a string or array of strings"],"goal":"Convert strings to camelCase or PascalCase with configurable uppercase preservation and locale support","kind":"HOW","packages":["pkg:npm/camelcase@6.3.0"],"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@6.3.0"],"schemaVersion":1,"subject":"pkg:npm/camelcase@6.3.0","symbols":["camelcase"],"verifierAdapter":"node-typescript@1"}

import camelcase from 'camelcase';

/**
 * Converts a string or array of strings to camelCase with optional configuration.
 *
 * @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.
 * @param {boolean} [options.preserveConsecutiveUppercase=false] - Preserve consecutive uppercase letters.
 * @param {string | string[] | boolean} [options.locale] - Locale for case mapping or false for Unicode default.
 * @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": "6.3.0"
      }
    },
    "node_modules/camelcase": {
      "version": "6.3.0",
      "resolved": "https://registry.npmjs.org/camelcase/-/camelcase-6.3.0.tgz",
      "integrity": "sha512-Gmy6FhYlCY7uOElZUSbxo2UCDH8owEk996gkbrpsgGtrJLM3J7jGxl9Ic7Qwwj4ivOE5AWZWRMecDdF7hqGjFA==",
      "license": "MIT",
      "engines": {
        "node": ">=10"
      },
      "funding": {
        "url": "https://github.com/sponsors/sindresorhus"
      }
    }
  }
}

{
  "name": "sample-camelcase",
  "version": "1.0.0",
  "private": true,
  "type": "module",
  "main": "index.mjs",
  "scripts": {
    "test": "node test/contract.mjs"
  },
  "dependencies": {
    "camelcase": "6.3.0"
  },
  "license": "MIT-0"
}

{
  "schemaVersion": 1,
  "goal": "Convert strings to camelCase or PascalCase with configurable uppercase preservation and locale support",
  "kind": "HOW",
  "packages": [
    "pkg:npm/camelcase@6.3.0"
  ],
  "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 consecutive uppercase abbreviations when preserveConsecutiveUppercase is set to true
assert.equal(camelcase('Foo-BAR', { preserveConsecutiveUppercase: true }), 'fooBAR');
assert.equal(camelcase('fooBAR', { pascalCase: true, preserveConsecutiveUppercase: true }), 'FooBAR');
assert.equal(toCamelCase('json-HTTP-request', { preserveConsecutiveUppercase: true }), 'jsonHTTPRequest');

// 5. camelcase applies locale-specific case mappings when locale is specified
assert.equal(camelcase('lorem-ipsum', { locale: 'tr-TR' }), 'loremİpsum');
assert.equal(camelcase('I-am', { locale: 'tr-TR' }), 'ıAm');
assert.equal(toCamelCase('lorem-ipsum', { locale: ['en-US', 'en-GB'] }), 'loremIpsum');

// 6. camelcase falls back to Unicode default case conversion when locale is set to false
assert.equal(camelcase('lorem-ipsum', { locale: false }), 'loremIpsum');
assert.equal(toCamelCase('lorem-ipsum', { locale: false }), 'loremIpsum');

// 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({}), { name: 'TypeError' });
assert.throws(() => toCamelCase(456), { name: 'TypeError' });

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