unique-filename 4.0.0

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 pkg:npm/unique-filename@4.0.0
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:npm/unique-filename@4.0.0

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:sha256:5c65793f513a950e3c369d07d5156a3d7486344646378d2dbbf5237360f89dc4","contract":["uniqueFilename(filepath) generates a random 8-character hex slug joined to filepath","uniqueFilename(filepath, prefix) prepends prefix and a hyphen before the random slug","uniqueFilename(filepath, prefix, uniq) produces a deterministic path for the same uniq string and omits the hyphen when prefix is empty or null"],"goal":"verify pkg:npm/unique-filename@4.0.0","kind":"HOW","packages":["pkg:npm/unique-filename@4.0.0"],"schemaVersion":1},"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/unique-filename@4.0.0"],"schemaVersion":1,"subject":"pkg:npm/unique-filename@4.0.0","verifierAdapter":"node-typescript@1"}

{
  "name": "verify-unique-filename",
  "version": "1.0.0",
  "lockfileVersion": 3,
  "requires": true,
  "packages": {
    "": {
      "name": "verify-unique-filename",
      "version": "1.0.0",
      "license": "MIT-0",
      "dependencies": {
        "unique-filename": "4.0.0"
      }
    },
    "node_modules/imurmurhash": {
      "version": "0.1.4",
      "resolved": "https://registry.npmjs.org/imurmurhash/-/imurmurhash-0.1.4.tgz",
      "integrity": "sha512-JmXMZ6wuvDmLiHEml9ykzqO6lwFbof0GG4IkcGaENdCRDDmMVnny7s5HsIgHCbaq0w2MyPhDqkhTUgS2LU2PHA==",
      "license": "MIT",
      "engines": {
        "node": ">=0.8.19"
      }
    },
    "node_modules/unique-filename": {
      "version": "4.0.0",
      "resolved": "https://registry.npmjs.org/unique-filename/-/unique-filename-4.0.0.tgz",
      "integrity": "sha512-XSnEewXmQ+veP7xX2dS5Q4yZAvO40cBN2MWkJ7D/6sW4Dg6wYBNwM1Vrnz1FhH5AdeLIlUXRI9e28z1YZi71NQ==",
      "license": "ISC",
      "dependencies": {
        "unique-slug": "^5.0.0"
      },
      "engines": {
        "node": "^18.17.0 || >=20.5.0"
      }
    },
    "node_modules/unique-slug": {
      "version": "5.0.0",
      "resolved": "https://registry.npmjs.org/unique-slug/-/unique-slug-5.0.0.tgz",
      "integrity": "sha512-9OdaqO5kwqR+1kVgHAhsp5vPNU0hnxRa26rBFNfNgM7M6pNtgzeBn3s/xbyCQL3dcjzOatcef6UUHpB/6MaETg==",
      "license": "ISC",
      "dependencies": {
        "imurmurhash": "^0.1.4"
      },
      "engines": {
        "node": "^18.17.0 || >=20.5.0"
      }
    }
  }
}

{
  "name": "verify-unique-filename",
  "version": "1.0.0",
  "private": true,
  "license": "MIT-0",
  "scripts": {
    "test": "node test/contract.mjs"
  },
  "dependencies": {
    "unique-filename": "4.0.0"
  }
}

{
  "schemaVersion": 1,
  "goal": "verify pkg:npm/unique-filename@4.0.0",
  "kind": "HOW",
  "packages": [
    "pkg:npm/unique-filename@4.0.0"
  ]
}

import assert from 'node:assert/strict';
import path from 'node:path';
import uniqueFilename from 'unique-filename';

// 1. Generate a random unique filename in a base directory without prefix
const randomPathA = uniqueFilename('cache-dir');
const randomPathB = uniqueFilename('cache-dir');
assert.equal(typeof randomPathA, 'string');
assert.equal(path.dirname(randomPathA), 'cache-dir');
assert.match(path.basename(randomPathA), /^[0-9a-f]{8}$/);
assert.notEqual(randomPathA, randomPathB);

// 2. Generate a random unique filename with a prefix
const prefixedPath = uniqueFilename('cache-dir', 'item');
assert.equal(path.dirname(prefixedPath), 'cache-dir');
assert.match(path.basename(prefixedPath), /^item-[0-9a-f]{8}$/);

// 3. Empty/undefined/null prefix behaves as no prefix
const emptyPrefixPath = uniqueFilename('cache-dir', '', 'deterministic-key');
const nullPrefixPath = uniqueFilename('cache-dir', null, 'deterministic-key');
assert.equal(emptyPrefixPath, nullPrefixPath);
assert.match(path.basename(emptyPrefixPath), /^[0-9a-f]{8}$/);

// 4. Deterministic unique filename when uniq string is provided
const detPath1 = uniqueFilename('cache-dir', 'artifact', 'input-identifier-1');
const detPath2 = uniqueFilename('cache-dir', 'artifact', 'input-identifier-1');
const detPath3 = uniqueFilename('cache-dir', 'artifact', 'input-identifier-2');
assert.equal(detPath1, detPath2);
assert.notEqual(detPath1, detPath3);
assert.equal(path.dirname(detPath1), 'cache-dir');
assert.match(path.basename(detPath1), /^artifact-[0-9a-f]{8}$/);