is-cidr 5.1.1: v6

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 is-cidr.v6 in pkg:npm/is-cidr@5.1.1
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:npm/is-cidr@5.1.1
Demonstrate these symbols/APIs:
  - is-cidr.v6

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:sha256:104ac37726aff70849e1a78899bb1f70de0b2f20736c787db301a30a1507ee47","contract":["v6(\"2001:db8::/32\") returns true for a valid IPv6 CIDR string","isCidr.v6(\"fe80::/10\") returns true when called on the default export","v6(\"192.168.1.0/24\") returns false for an IPv4 CIDR string","v6(\"2001:db8::\") returns false for an IPv6 address without a prefix length","v6(\"2001:db8::/129\") returns false for an out-of-range IPv6 prefix length"],"goal":"verify is-cidr.v6 in pkg:npm/is-cidr@5.1.1","kind":"HOW","packages":["pkg:npm/is-cidr@5.1.1"],"schemaVersion":1,"symbols":["is-cidr.v6"]},"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/is-cidr@5.1.1"],"schemaVersion":1,"subject":"pkg:npm/is-cidr@5.1.1","symbols":["is-cidr.v6"],"verifierAdapter":"node-typescript@1"}

{
  "name": "sample",
  "version": "1.0.0",
  "lockfileVersion": 3,
  "requires": true,
  "packages": {
    "": {
      "name": "sample",
      "version": "1.0.0",
      "dependencies": {
        "is-cidr": "5.1.1"
      }
    },
    "node_modules/cidr-regex": {
      "version": "4.1.3",
      "resolved": "https://registry.npmjs.org/cidr-regex/-/cidr-regex-4.1.3.tgz",
      "integrity": "sha512-86M1y3ZeQvpZkZejQCcS+IaSWjlDUC+ORP0peScQ4uEUFCZ8bEQVz7NlJHqysoUb6w3zCjx4Mq/8/2RHhMwHYw==",
      "license": "BSD-2-Clause",
      "dependencies": {
        "ip-regex": "^5.0.0"
      },
      "engines": {
        "node": ">=14"
      }
    },
    "node_modules/ip-regex": {
      "version": "5.0.0",
      "resolved": "https://registry.npmjs.org/ip-regex/-/ip-regex-5.0.0.tgz",
      "integrity": "sha512-fOCG6lhoKKakwv+C6KdsOnGvgXnmgfmp0myi3bcNwj3qfwPAxRKWEuFhvEFF7ceYIz6+1jRZ+yguLFAmUNPEfw==",
      "license": "MIT",
      "engines": {
        "node": "^12.20.0 || ^14.13.1 || >=16.0.0"
      },
      "funding": {
        "url": "https://github.com/sponsors/sindresorhus"
      }
    },
    "node_modules/is-cidr": {
      "version": "5.1.1",
      "resolved": "https://registry.npmjs.org/is-cidr/-/is-cidr-5.1.1.tgz",
      "integrity": "sha512-AwzRMjtJNTPOgm7xuYZ71715z99t+4yRnSnSzgK5err5+heYi4zMuvmpUadaJ28+KCXCQo8CjUrKQZRWSPmqTQ==",
      "license": "BSD-2-Clause",
      "dependencies": {
        "cidr-regex": "^4.1.1"
      },
      "engines": {
        "node": ">=14"
      }
    }
  }
}

{
  "name": "sample",
  "version": "1.0.0",
  "private": true,
  "type": "module",
  "scripts": {
    "test": "node test/contract.mjs"
  },
  "dependencies": {
    "is-cidr": "5.1.1"
  }
}

{
  "schemaVersion": 1,
  "goal": "verify is-cidr.v6 in pkg:npm/is-cidr@5.1.1",
  "kind": "HOW",
  "packages": [
    "pkg:npm/is-cidr@5.1.1"
  ],
  "symbols": [
    "is-cidr.v6"
  ]
}

import assert from "node:assert/strict";
import isCidr, { v6 } from "is-cidr";

assert.equal(v6("2001:db8::/32"), true);
assert.equal(isCidr.v6("fe80::/10"), true);
assert.equal(v6("::1/128"), true);
assert.equal(v6("192.168.1.0/24"), false);
assert.equal(isCidr.v6("2001:db8::"), false);
assert.equal(v6("2001:db8::/129"), false);