walk-up-path 3.0.1: walkUp

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/walk-up-path@3.0.1
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:npm/walk-up-path@3.0.1

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:f257c5847ecd8283c0a145ef15ba0db829446ba5fda515a0606d2352e1b9eee3","contract":["walkUp(path) yields resolved path followed by each ancestor dirname up to the filesystem root","walkUp(root) yields only the filesystem root and terminates"],"goal":"verify pkg:npm/walk-up-path@3.0.1","kind":"HOW","packages":["pkg:npm/walk-up-path@3.0.1"],"schemaVersion":1,"symbols":["walkUp"]},"contractCommand":["node","test/contract.mjs"],"environment":{"arch":"x64","distro":"ubuntu","ecosystem":"npm","executionContext":"node","libc":"glibc","libcVersion":"2.39","moduleSystem":"esm","os":"linux","osVersionBucket":"24","packageManager":"npm","runtime":"node","schemaVersion":1},"license":"MIT-0","packages":["pkg:npm/walk-up-path@3.0.1"],"schemaVersion":1,"subject":"pkg:npm/walk-up-path@3.0.1","symbols":["walkUp"],"verifierAdapter":"node-typescript@1"}

{
  "name": "sample-walk-up-path",
  "version": "1.0.0",
  "lockfileVersion": 3,
  "requires": true,
  "packages": {
    "": {
      "name": "sample-walk-up-path",
      "version": "1.0.0",
      "dependencies": {
        "walk-up-path": "3.0.1"
      }
    },
    "node_modules/walk-up-path": {
      "version": "3.0.1",
      "resolved": "https://registry.npmjs.org/walk-up-path/-/walk-up-path-3.0.1.tgz",
      "integrity": "sha512-9YlCL/ynK3CTlrSRrDxZvUauLzAswPCrsaCgilqFevUYpeEW0/3ScEjaa3kbW/T0ghhkEr7mv+fpjqn1Y1YuTA==",
      "license": "ISC"
    }
  }
}

{
  "name": "sample-walk-up-path",
  "version": "1.0.0",
  "private": true,
  "type": "module",
  "scripts": {
    "test": "node test/contract.mjs"
  },
  "dependencies": {
    "walk-up-path": "3.0.1"
  }
}

{
  "schemaVersion": 1,
  "goal": "verify pkg:npm/walk-up-path@3.0.1",
  "kind": "HOW",
  "packages": [
    "pkg:npm/walk-up-path@3.0.1"
  ]
}

import assert from 'node:assert/strict';
import path from 'node:path';
import { walkUp } from 'walk-up-path';

const target = path.resolve('alpha', 'beta', 'gamma');
const steps = [...walkUp(target)];

assert.equal(steps[0], target);
assert.equal(steps[1], path.dirname(target));
assert.equal(steps[2], path.dirname(path.dirname(target)));
assert.equal(steps.at(-1), path.parse(target).root);

const root = path.parse(target).root;
assert.deepEqual([...walkUp(root)], [root]);