jest-validate 30.4.1: format

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 jest-validate.format in pkg:npm/jest-validate@30.4.1
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:npm/jest-validate@30.4.1
Demonstrate these symbols/APIs:
  - jest-validate.format

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.

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  "requires": true,
  "packages": {
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{
  "name": "sample-jest-validate-format",
  "version": "1.0.0",
  "private": true,
  "description": "Clean-room verification of jest-validate.format",
  "main": "src/index.js",
  "dependencies": {
    "jest-validate": "30.4.1"
  }
}

{
  "schemaVersion": 1,
  "goal": "verify jest-validate.format in pkg:npm/jest-validate@30.4.1",
  "kind": "HOW",
  "packages": [
    "pkg:npm/jest-validate@30.4.1"
  ],
  "symbols": [
    "jest-validate.format"
  ]
}

const { format } = require('jest-validate');

/**
 * Format a value into a concise string representation using jest-validate.
 * @param {unknown} value - Value to format.
 * @returns {string} Formatted string representation.
 */
function formatValue(value) {
  return format(value);
}

module.exports = {
  formatValue,
  format
};

import assert from 'node:assert';
import { createRequire } from 'node:module';

const require = createRequire(import.meta.url);
const { formatValue, format } = require('../src/index.js');

// 1. Export verification
assert.strictEqual(typeof formatValue, 'function', 'formatValue should be a function');
assert.strictEqual(typeof format, 'function', 'format should be a function');

// 2. Format primitive values into compact string representations
assert.strictEqual(formatValue('hello'), '"hello"', 'String should be formatted with double quotes');
assert.strictEqual(formatValue(42), '42', 'Number should be formatted to numeric string');
assert.strictEqual(formatValue(true), 'true', 'Boolean true should be formatted as "true"');
assert.strictEqual(formatValue(false), 'false', 'Boolean false should be formatted as "false"');

// 3. Format null and undefined values correctly
assert.strictEqual(formatValue(null), 'null', 'null should be formatted as "null"');
assert.strictEqual(formatValue(undefined), 'undefined', 'undefined should be formatted as "undefined"');

// 4. Format plain objects and arrays with minimal whitespace
assert.strictEqual(
  formatValue({ a: 1, b: 'two' }),
  '{"a": 1, "b": "two"}',
  'Object should be formatted with compact key-value pairs'
);
assert.strictEqual(
  formatValue([1, 'two', true]),
  '[1, "two", true]',
  'Array should be formatted with compact comma-separated items'
);
assert.strictEqual(
  formatValue({ nested: { count: 10 }, list: [1, 2] }),
  '{"list": [1, 2], "nested": {"count": 10}}',
  'Nested objects and arrays should be formatted consistently'
);

// 5. Convert functions into their string source representations
const sampleFunc = (x) => x * 2;
assert.strictEqual(
  formatValue(sampleFunc),
  sampleFunc.toString(),
  'Function should be formatted using its source string'
);

function namedFunc(a, b) {
  return a + b;
}
assert.strictEqual(
  formatValue(namedFunc),
  namedFunc.toString(),
  'Named function should be formatted using its source string'
);

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