update-browserslist-db 1.2.3: length

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 update-browserslist-db.length in pkg:npm/update-browserslist-db@1.2.3
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:npm/update-browserslist-db@1.2.3
Demonstrate these symbols/APIs:
  - update-browserslist-db.length

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:sha256:086d59d4054fcf22c0f4607cd94ff0736257bd4e57a8a566f9c3040829a3d940","contract":["update-browserslist-db default export is a function whose length property is 0","update-browserslist-db.length is a number with value 0 due to default parameter print = defaultPrint","update-browserslist-db function length property descriptor is non-writable and non-enumerable with value 0"],"goal":"verify update-browserslist-db.length in pkg:npm/update-browserslist-db@1.2.3","kind":"HOW","packages":["pkg:npm/update-browserslist-db@1.2.3"],"schemaVersion":1,"symbols":["update-browserslist-db.length"]},"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/update-browserslist-db@1.2.3"],"schemaVersion":1,"subject":"pkg:npm/update-browserslist-db@1.2.3","symbols":["update-browserslist-db.length"],"verifierAdapter":"node-typescript@1"}

import updateDB from 'update-browserslist-db';
export default updateDB;

{
  "name": "sample-update-browserslist-db-length",
  "version": "1.0.0",
  "lockfileVersion": 3,
  "requires": true,
  "packages": {
    "": {
      "name": "sample-update-browserslist-db-length",
      "version": "1.0.0",
      "dependencies": {
        "update-browserslist-db": "1.2.3"
      }
    },
    "node_modules/baseline-browser-mapping": {
      "version": "2.11.21",
      "resolved": "https://registry.npmjs.org/baseline-browser-mapping/-/baseline-browser-mapping-2.11.21.tgz",
      "integrity": "sha512-uh8vpY/1/YyFkunIDFH/12p7/7VdPKA1hejMVEbdkEaWnUz0Hesvx5EbiU6XxjyHZIOju+ZMbQJkRh+es3/spQ==",
      "license": "Apache-2.0",
      "peer": true,
      "bin": {
        "baseline-browser-mapping": "dist/cli.cjs"
      },
      "engines": {
        "node": ">=6.0.0"
      }
    },
    "node_modules/browserslist": {
      "version": "4.28.9",
      "resolved": "https://registry.npmjs.org/browserslist/-/browserslist-4.28.9.tgz",
      "integrity": "sha512-EWazOblFYUvlGZcfGhPUPmYh3nikUxBVb+y9MJun5f3hBi812X+8MSQTujLBtgK3cf51fJWbWfOjyeO954d+Eg==",
      "funding": [
        {
          "type": "opencollective",
          "url": "https://opencollective.com/browserslist"
        },
        {
          "type": "tidelift",
          "url": "https://tidelift.com/funding/github/npm/browserslist"
        },
        {
          "type": "github",
          "url": "https://github.com/sponsors/ai"
        }
      ],
      "license": "MIT",
      "peer": true,
      "dependencies": {
        "baseline-browser-mapping": "^2.11.20",
        "caniuse-lite": "^1.0.30001810",
        "electron-to-chromium": "^1.5.420",
        "node-releases": "^2.0.54",
        "update-browserslist-db": "^1.3.2"
      },
      "bin": {
        "browserslist": "cli.js"
      },
      "engines": {
        "node": "^6 || ^7 || ^8 || ^9 || ^10 || ^11 || ^12 || >=13.7"
      }
    },
    "node_modules/browserslist/node_modules/update-browserslist-db": {
      "version": "1.3.2",
      "resolved": "https://registry.npmjs.org/update-browserslist-db/-/update-browserslist-db-1.3.2.tgz",
      "integrity": "sha512-UQ+MSxlhRm1bzjhU+DcuXfjFO1FzNtqhK5+9Yvlp90ItDLk5vT932A0rFu619nf7RVS+Y/VeaUW1jaRDqZ8VJw==",
      "funding": [
        {
          "type": "opencollective",
          "url": "https://opencollective.com/browserslist"
        },
        {
          "type": "tidelift",
          "url": "https://tidelift.com/funding/github/npm/browserslist"
        },
        {
          "type": "github",
          "url": "https://github.com/sponsors/ai"
        }
      ],
      "license": "MIT",
      "peer": true,
      "dependencies": {
        "escalade": "^3.2.0",
        "picocolors": "^1.1.1"
      },
      "bin": {
        "update-browserslist-db": "cli.js"
      },
      "peerDependencies": {
        "browserslist": ">= 4.21.0"
      }
    },
    "node_modules/caniuse-lite": {
      "version": "1.0.30001810",
      "resolved": "https://registry.npmjs.org/caniuse-lite/-/caniuse-lite-1.0.30001810.tgz",
      "integrity": "sha512-TITQPUkaz+aVk5GL6NhOdwk1aEaNTSDPsGFWrTuhKGtjTF70jL/Oht2W4c6rXUe5fu7Ie19VIahAXHIIiWWNeg==",
      "funding": [
        {
          "type": "opencollective",
          "url": "https://opencollective.com/browserslist"
        },
        {
          "type": "tidelift",
          "url": "https://tidelift.com/funding/github/npm/caniuse-lite"
        },
        {
          "type": "github",
          "url": "https://github.com/sponsors/ai"
        }
      ],
      "license": "CC-BY-4.0",
      "peer": true
    },
    "node_modules/electron-to-chromium": {
      "version": "1.5.422",
      "resolved": "https://registry.npmjs.org/electron-to-chromium/-/electron-to-chromium-1.5.422.tgz",
      "integrity": "sha512-UvA/32XqrLDdZSn7Jllo1AYNcWji/G0d5M0GTViE7KoGBiMunw3a34Sb2KO4ZZyrSEhqsxFoVhWWJshdyfKqJA==",
      "license": "ISC",
      "peer": true
    },
    "node_modules/escalade": {
      "version": "3.2.0",
      "resolved": "https://registry.npmjs.org/escalade/-/escalade-3.2.0.tgz",
      "integrity": "sha512-WUj2qlxaQtO4g6Pq5c29GTcWGDyd8itL8zTlipgECz3JesAiiOKotd8JU6otB3PACgG6xkJUyVhboMS+bje/jA==",
      "license": "MIT",
      "engines": {
        "node": ">=6"
      }
    },
    "node_modules/node-releases": {
      "version": "2.0.54",
      "resolved": "https://registry.npmjs.org/node-releases/-/node-releases-2.0.54.tgz",
      "integrity": "sha512-YHs7BmmcsdAI5Ozuf8JZo6PT0mv2GIWC9vMfvUC3dp65M8hn7Ux8CPL+2oBI7juNuj9d0ndhTcznq2ODBps9cQ==",
      "license": "MIT",
      "peer": true,
      "engines": {
        "node": ">=18"
      }
    },
    "node_modules/picocolors": {
      "version": "1.1.1",
      "resolved": "https://registry.npmjs.org/picocolors/-/picocolors-1.1.1.tgz",
      "integrity": "sha512-xceH2snhtb5M9liqDsmEw56le376mTZkEX/jEb/RxNFyegNul7eNslCXP9FDj/Lcu0X8KEyMceP2ntpaHrDEVA==",
      "license": "ISC"
    },
    "node_modules/update-browserslist-db": {
      "version": "1.2.3",
      "resolved": "https://registry.npmjs.org/update-browserslist-db/-/update-browserslist-db-1.2.3.tgz",
      "integrity": "sha512-Js0m9cx+qOgDxo0eMiFGEueWztz+d4+M3rGlmKPT+T4IS/jP4ylw3Nwpu6cpTTP8R1MAC1kF4VbdLt3ARf209w==",
      "funding": [
        {
          "type": "opencollective",
          "url": "https://opencollective.com/browserslist"
        },
        {
          "type": "tidelift",
          "url": "https://tidelift.com/funding/github/npm/browserslist"
        },
        {
          "type": "github",
          "url": "https://github.com/sponsors/ai"
        }
      ],
      "license": "MIT",
      "dependencies": {
        "escalade": "^3.2.0",
        "picocolors": "^1.1.1"
      },
      "bin": {
        "update-browserslist-db": "cli.js"
      },
      "peerDependencies": {
        "browserslist": ">= 4.21.0"
      }
    }
  }
}

{
  "name": "sample-update-browserslist-db-length",
  "version": "1.0.0",
  "type": "module",
  "main": "index.mjs",
  "scripts": {
    "test": "node test/contract.mjs"
  },
  "dependencies": {
    "update-browserslist-db": "1.2.3"
  }
}

{
  "schemaVersion": 1,
  "goal": "verify update-browserslist-db.length in pkg:npm/update-browserslist-db@1.2.3",
  "kind": "HOW",
  "packages": [
    "pkg:npm/update-browserslist-db@1.2.3"
  ],
  "symbols": [
    "update-browserslist-db.length"
  ]
}

import assert from 'node:assert/strict';
import updateDB from 'update-browserslist-db';

// 1. update-browserslist-db default export is a function whose length property is 0
{
  assert.equal(typeof updateDB, 'function');
  assert.equal(typeof updateDB.length, 'number');
  assert.equal(updateDB.length, 0);
}

// 2. update-browserslist-db.length is a number with value 0 due to default parameter print = defaultPrint
{
  assert.strictEqual(updateDB.length, 0);
  assert.notStrictEqual(updateDB.length, 1);
  assert.equal(updateDB.name, 'updateDB');
}

// 3. update-browserslist-db function length property descriptor is non-writable and non-enumerable with value 0
{
  const desc = Object.getOwnPropertyDescriptor(updateDB, 'length');
  assert.ok(desc !== undefined);
  assert.equal(desc.value, 0);
  assert.equal(desc.writable, false);
  assert.equal(desc.enumerable, false);
  assert.equal(desc.configurable, true);
}

console.log('All update-browserslist-db.length contract assertions passed.');