CodeSampleX

Sample

jest-validate 30.4.1: format

Verified sample for npm jest-validate 30.4.1: format. The contract ran on node 22 · linux debian/x64 · docker and passed: formatValue formats primitive…

sha256:327d4359513e63a6b95364d3f9bf71863559370ebc7d16dc9763cbb92b678bd0

This network offers one thing: a sample that builds. It ran the sample in a sandbox and kept the signed receipt. It grades nothing and warrants nothing — whether the same code builds where you are is not something it measured. How many distinct signing keys filed a passing contract receipt. One is the author alone; more than one means somebody else built it too. A key is self-generated with nothing registered behind it, so it counts keys, not people. MIT-0

Execution evidence

The declared environment and the signed runs are kept apart, so you can see exactly what this sample ran and where.

Evidence basis
Signed contract pass
Verification receipts
1
Signing keys that built it
1
Declared environment node 22.23 linux 24 · ubuntu · glibc 2.39 x64 node 22.23 javascript npm 10

Verification-run environments

Environment Contract Stages Run
node 22 · linux debian/x64 · docker ed25519:c1973797be207ac4 PASS compile:SKIPPED · contract:PASS · load:PASS · resolve:PASS
CONTAINER_RUN · node-typescript@1node:22@sha256:8a34c4ab3ea2…		 2026-09-06

Case

HOW
Goal
verify jest-validate.format in pkg:npm/jest-validate@30.4.1
Packages
Symbols
  • jest-validate.format
Environment
node 22.23.2
Created
2026-09-06T07:53:27Z

Contract

  1. formatValue formats primitive values into compact string representations
  2. formatValue formats null and undefined values correctly
  3. formatValue formats plain objects and arrays with minimal whitespace
  4. formatValue converts functions into their string source representations

Files

  • PROMPT.md
  • csx.json
  • package-lock.json
  • package.json
  • spec.json
  • src/index.js
  • test/contract.mjs

Download the source artifact (tar.gz)

Source

PROMPT.md
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.
csx.json
{"case":{"caseId":"case:sha256:36943b888e55d9a5a8d958148f35ba290b481d2d6bc80d6e4aa6c6880238fc60","contract":["formatValue formats primitive values into compact string representations","formatValue formats null and undefined values correctly","formatValue formats plain objects and arrays with minimal whitespace","formatValue converts functions into their string source representations"],"goal":"verify jest-validate.format in pkg:npm/jest-validate@30.4.1","kind":"HOW","packages":["pkg:npm/jest-validate@30.4.1"],"schemaVersion":1,"symbols":["jest-validate.format"]},"contractCommand":["node","test/contract.mjs"],"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/jest-validate@30.4.1"],"schemaVersion":1,"subject":"pkg:npm/jest-validate@30.4.1","symbols":["jest-validate.format"],"verifierAdapter":"node-typescript@1"}
package-lock.json
{
  "name": "sample-jest-validate-format",
  "version": "1.0.0",
  "lockfileVersion": 3,
  "requires": true,
  "packages": {
    "": {
      "name": "sample-jest-validate-format",
      "version": "1.0.0",
      "dependencies": {
        "jest-validate": "30.4.1"
      }
    },
    "node_modules/@jest/get-type": {
      "version": "30.1.0",
      "resolved": "https://registry.npmjs.org/@jest/get-type/-/get-type-30.1.0.tgz",
      "integrity": "sha512-eMbZE2hUnx1WV0pmURZY9XoXPkUYjpc55mb0CrhtdWLtzMQPFvu/rZkTLZFTsdaVQa+Tr4eWAteqcUzoawq/uA==",
      "license": "MIT",
      "engines": {
        "node": "^18.14.0 || ^20.0.0 || ^22.0.0 || >=24.0.0"
      }
    },
    "node_modules/@jest/pattern": {
      "version": "30.4.0",
      "resolved": "https://registry.npmjs.org/@jest/pattern/-/pattern-30.4.0.tgz",
      "integrity": "sha512-RAWn3+f9u8BsHijKJ71uHcFp6vmyEt6VvoWXkl6hKF3qVIuWNmudVjg12DlBPGup/frIl5UcUlH5HfEuvHpEXg==",
      "license": "MIT",
      "dependencies": {
        "@types/node": "*",
        "jest-regex-util": "30.4.0"
      },
      "engines": {
        "node": "^18.14.0 || ^20.0.0 || ^22.0.0 || >=24.0.0"
      }
    },
    "node_modules/@jest/schemas": {
      "version": "30.4.1",
      "resolved": "https://registry.npmjs.org/@jest/schemas/-/schemas-30.4.1.tgz",
      "integrity": "sha512-i6b4qw5qnP8c5FEeBJg/uZQ4ddrkN6Ca8qISJh0pr7a5hfn3h3v5x60BEbOC7OYAGZNMs1LfFLwnW2CuK8F57Q==",
      "license": "MIT",
      "dependencies": {
        "@sinclair/typebox": "^0.34.0"
      },
      "engines": {
        "node": "^18.14.0 || ^20.0.0 || ^22.0.0 || >=24.0.0"
      }
    },
    "node_modules/@jest/types": {
      "version": "30.4.1",
      "resolved": "https://registry.npmjs.org/@jest/types/-/types-30.4.1.tgz",
      "integrity": "sha512-f1x/vJXIfjOlEmejYpbkbgw1gOqpPECwMvMEtBqe47j7H2Hg8h8w3o3ikhSXq3MI15kg+oQ0exWO0uCtTNJLoQ==",
      "license": "MIT",
      "dependencies": {
        "@jest/pattern": "30.4.0",
        "@jest/schemas": "30.4.1",
        "@types/istanbul-lib-coverage": "^2.0.6",
        "@types/istanbul-reports": "^3.0.4",
        "@types/node": "*",
        "@types/yargs": "^17.0.33",
        "chalk": "^4.1.2"
      },
      "engines": {
        "node": "^18.14.0 || ^20.0.0 || ^22.0.0 || >=24.0.0"
      }
    },
    "node_modules/@sinclair/typebox": {
      "version": "0.34.52",
      "resolved": "https://registry.npmjs.org/@sinclair/typebox/-/typebox-0.34.52.tgz",
      "integrity": "sha512-XiMQh7qqVlxZzcVD+kkGMNGMzcTrDMLWI7S4x7z1MkCkbDPrekpZXEUK0eZqZFMuHQg2a2DZOcDIh9o5v3Gonw==",
      "license": "MIT"
    },
    "node_modules/@types/istanbul-lib-coverage": {
      "version": "2.0.6",
      "resolved": "https://registry.npmjs.org/@types/istanbul-lib-coverage/-/istanbul-lib-coverage-2.0.6.tgz",
      "integrity": "sha512-2QF/t/auWm0lsy8XtKVPG19v3sSOQlJe/YHZgfjb/KBBHOGSV+J2q/S671rcq9uTBrLAXmZpqJiaQbMT+zNU1w==",
      "license": "MIT"
    },
    "node_modules/@types/istanbul-lib-report": {
      "version": "3.0.3",
      "resolved": "https://registry.npmjs.org/@types/istanbul-lib-report/-/istanbul-lib-report-3.0.3.tgz",
      "integrity": "sha512-NQn7AHQnk/RSLOxrBbGyJM/aVQ+pjj5HCgasFxc0K/KhoATfQ/47AyUl15I2yBUpihjmas+a+VJBOqecrFH+uA==",
      "license": "MIT",
      "dependencies": {
        "@types/istanbul-lib-coverage": "*"
      }
    },
    "node_modules/@types/istanbul-reports": {
      "version": "3.0.4",
      "resolved": "https://registry.npmjs.org/@types/istanbul-reports/-/istanbul-reports-3.0.4.tgz",
      "integrity": "sha512-pk2B1NWalF9toCRu6gjBzR69syFjP4Od8WRAX+0mmf9lAjCRicLOWc+ZrxZHx/0XRjotgkF9t6iaMJ+aXcOdZQ==",
      "license": "MIT",
      "dependencies": {
        "@types/istanbul-lib-report": "*"
      }
    },
    "node_modules/@types/node": {
      "version": "26.4.1",
      "resolved": "https://registry.npmjs.org/@types/node/-/node-26.4.1.tgz",
      "integrity": "sha512-k97ENvZWtvA6yqz5/FS6a7duDgOPEeOQOc2iKS/nY6mX6qJUKtLnWzQS+Xj6tXweyj6ZcTAK2Qecetnvi9nCLA==",
      "license": "MIT",
      "dependencies": {
        "undici-types": "~8.3.0"
      }
    },
    "node_modules/@types/yargs": {
      "version": "17.0.35",
      "resolved": "https://registry.npmjs.org/@types/yargs/-/yargs-17.0.35.tgz",
      "integrity": "sha512-qUHkeCyQFxMXg79wQfTtfndEC+N9ZZg76HJftDJp+qH2tV7Gj4OJi7l+PiWwJ+pWtW8GwSmqsDj/oymhrTWXjg==",
      "license": "MIT",
      "dependencies": {
        "@types/yargs-parser": "*"
      }
    },
    "node_modules/@types/yargs-parser": {
      "version": "21.0.3",
      "resolved": "https://registry.npmjs.org/@types/yargs-parser/-/yargs-parser-21.0.3.tgz",
      "integrity": "sha512-I4q9QU9MQv4oEOz4tAHJtNz1cwuLxn2F3xcc2iV5WdqLPpUnj30aUuxt1mAxYTG+oe8CZMV/+6rU4S4gRDzqtQ==",
      "license": "MIT"
    },
    "node_modules/ansi-styles": {
      "version": "4.3.0",
      "resolved": "https://registry.npmjs.org/ansi-styles/-/ansi-styles-4.3.0.tgz",
      "integrity": "sha512-zbB9rCJAT1rbjiVDb2hqKFHNYLxgtk8NURxZ3IZwD3F6NtxbXZQCnnSi1Lkx+IDohdPlFp222wVALIheZJQSEg==",
      "license": "MIT",
      "dependencies": {
        "color-convert": "^2.0.1"
      },
      "engines": {
        "node": ">=8"
      },
      "funding": {
        "url": "https://github.com/chalk/ansi-styles?sponsor=1"
      }
    },
    "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"
      }
    },
    "node_modules/chalk": {
      "version": "4.1.2",
      "resolved": "https://registry.npmjs.org/chalk/-/chalk-4.1.2.tgz",
      "integrity": "sha512-oKnbhFyRIXpUuez8iBMmyEa4nbj4IOQyuhc/wy9kY7/WVPcwIO9VA668Pu8RkO7+0G76SLROeyw9CpQ061i4mA==",
      "license": "MIT",
      "dependencies": {
        "ansi-styles": "^4.1.0",
        "supports-color": "^7.1.0"
      },
      "engines": {
        "node": ">=10"
      },
      "funding": {
        "url": "https://github.com/chalk/chalk?sponsor=1"
      }
    },
    "node_modules/color-convert": {
      "version": "2.0.1",
      "resolved": "https://registry.npmjs.org/color-convert/-/color-convert-2.0.1.tgz",
      "integrity": "sha512-RRECPsj7iu/xb5oKYcsFHSppFNnsj/52OVTRKb4zP5onXwVF3zVmmToNcOfGC+CRDpfK/U584fMg38ZHCaElKQ==",
      "license": "MIT",
      "dependencies": {
        "color-name": "~1.1.4"
      },
      "engines": {
        "node": ">=7.0.0"
      }
    },
    "node_modules/color-name": {
      "version": "1.1.4",
      "resolved": "https://registry.npmjs.org/color-name/-/color-name-1.1.4.tgz",
      "integrity": "sha512-dOy+3AuW3a2wNbZHIuMZpTcgjGuLU/uBL/ubcZF9OXbDo8ff4O8yVp5Bf0efS8uEoYo5q4Fx7dY9OgQGXgAsQA==",
      "license": "MIT"
    },
    "node_modules/has-flag": {
      "version": "4.0.0",
      "resolved": "https://registry.npmjs.org/has-flag/-/has-flag-4.0.0.tgz",
      "integrity": "sha512-EykJT/Q1KjTWctppgIAgfSO0tKVuZUjhgMr17kqTumMl6Afv3EISleU7qZUzoXDFTAHTDC4NOoG/ZxU3EvlMPQ==",
      "license": "MIT",
      "engines": {
        "node": ">=8"
      }
    },
    "node_modules/jest-regex-util": {
      "version": "30.4.0",
      "resolved": "https://registry.npmjs.org/jest-regex-util/-/jest-regex-util-30.4.0.tgz",
      "integrity": "sha512-mWlvLviKIgIQ8VCuM1xRdD0TWp3zlzionlmDBjuXVBs+VkmXq6FgW9T4Emr7oGz/Rk6feDCGyiugolcQEyp3mg==",
      "license": "MIT",
      "engines": {
        "node": "^18.14.0 || ^20.0.0 || ^22.0.0 || >=24.0.0"
      }
    },
    "node_modules/jest-validate": {
      "version": "30.4.1",
      "resolved": "https://registry.npmjs.org/jest-validate/-/jest-validate-30.4.1.tgz",
      "integrity": "sha512-PDWi4SOwLnwqNDfHZjOcsEFyZ4fc/2W2gVL3DEoyqnB6jCQMLRtfBong8s6omIw3lI0HWOus12xfnFmQtjW3fw==",
      "license": "MIT",
      "dependencies": {
        "@jest/get-type": "30.1.0",
        "@jest/types": "30.4.1",
        "camelcase": "^6.3.0",
        "chalk": "^4.1.2",
        "leven": "^3.1.0",
        "pretty-format": "30.4.1"
      },
      "engines": {
        "node": "^18.14.0 || ^20.0.0 || ^22.0.0 || >=24.0.0"
      }
    },
    "node_modules/leven": {
      "version": "3.1.0",
      "resolved": "https://registry.npmjs.org/leven/-/leven-3.1.0.tgz",
      "integrity": "sha512-qsda+H8jTaUaN/x5vzW2rzc+8Rw4TAQ/4KjB46IwK5VH+IlVeeeje/EoZRpiXvIqjFgK84QffqPztGI3VBLG1A==",
      "license": "MIT",
      "engines": {
        "node": ">=6"
      }
    },
    "node_modules/pretty-format": {
      "version": "30.4.1",
      "resolved": "https://registry.npmjs.org/pretty-format/-/pretty-format-30.4.1.tgz",
      "integrity": "sha512-K6KiKMHTL4jjX4u3Kir2EW07nRfcqVTXIImx50wbjHQTcZPgg+gjVeNTIT3l3L1Rd4UefxfogquC9J37SoFyyw==",
      "license": "MIT",
      "dependencies": {
        "@jest/schemas": "30.4.1",
        "ansi-styles": "^5.2.0",
        "react-is-18": "npm:react-is@^18.3.1",
        "react-is-19": "npm:react-is@^19.2.5"
      },
      "engines": {
        "node": "^18.14.0 || ^20.0.0 || ^22.0.0 || >=24.0.0"
      }
    },
    "node_modules/pretty-format/node_modules/ansi-styles": {
      "version": "5.2.0",
      "resolved": "https://registry.npmjs.org/ansi-styles/-/ansi-styles-5.2.0.tgz",
      "integrity": "sha512-Cxwpt2SfTzTtXcfOlzGEee8O+c+MmUgGrNiBcXnuWxuFJHe6a5Hz7qwhwe5OgaSYI0IJvkLqWX1ASG+cJOkEiA==",
      "license": "MIT",
      "engines": {
        "node": ">=10"
      },
      "funding": {
        "url": "https://github.com/chalk/ansi-styles?sponsor=1"
      }
    },
    "node_modules/react-is-18": {
      "name": "react-is",
      "version": "18.3.1",
      "resolved": "https://registry.npmjs.org/react-is/-/react-is-18.3.1.tgz",
      "integrity": "sha512-/LLMVyas0ljjAtoYiPqYiL8VWXzUUdThrmU5+n20DZv+a+ClRoevUzw5JxU+Ieh5/c87ytoTBV9G1FiKfNJdmg==",
      "license": "MIT"
    },
    "node_modules/react-is-19": {
      "name": "react-is",
      "version": "19.2.8",
      "resolved": "https://registry.npmjs.org/react-is/-/react-is-19.2.8.tgz",
      "integrity": "sha512-s5un28nYxKJw5gvUHyW5PCC28CvBqLu9r3cWgzHT4Vo/5fqqkFcdRYsGcKf50WMPpjjFZS5d76fn3YCo2njKwQ==",
      "license": "MIT"
    },
    "node_modules/supports-color": {
      "version": "7.2.0",
      "resolved": "https://registry.npmjs.org/supports-color/-/supports-color-7.2.0.tgz",
      "integrity": "sha512-qpCAvRl9stuOHveKsn7HncJRvv501qIacKzQlO/+Lwxc9+0q2wLyv4Dfvt80/DPn2pqOBsJdDiogXGR9+OvwRw==",
      "license": "MIT",
      "dependencies": {
        "has-flag": "^4.0.0"
      },
      "engines": {
        "node": ">=8"
      }
    },
    "node_modules/undici-types": {
      "version": "8.3.0",
      "resolved": "https://registry.npmjs.org/undici-types/-/undici-types-8.3.0.tgz",
      "integrity": "sha512-j375ScV60dom+YkPFIfTLcOiPxkN/buHz5GobjLhixFuANaNs3C9l4GmrWqejgXWJ7BbJcFYpTEUkS1Ge8bpZQ==",
      "license": "MIT"
    }
  }
}
package.json
{
  "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"
  }
}
spec.json
{
  "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"
  ]
}
src/index.js
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
};
test/contract.mjs
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.');

Origin Seeder

anonymous