abbrev 3.0.1: abbrev

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/abbrev@3.0.1
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:npm/abbrev@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:a30bc4f0ef0b1239b23c94491743d6ded2a3b1665f2a622f8b2eda92c3b6f617","contract":["abbrev(['fool', 'foo', 'folding', 'flop']) and variadic abbrev('fool', 'foo', 'folding', 'flop') return identical prefix-to-word maps without mutating the input array","shared prefixes ('f', 'fo') are omitted while exact word 'foo' maps to 'foo' and 'fool' maps to 'fool'","a single string argument abbrev('ruby') maps every prefix ('r', 'ru', 'rub', 'ruby') to 'ruby'","duplicate words are deduplicated without collision and non-string items are coerced to strings via String()","abbrev() with no arguments or abbrev([]) with an empty array returns an empty object {}"],"goal":"verify pkg:npm/abbrev@3.0.1","kind":"HOW","packages":["pkg:npm/abbrev@3.0.1"],"schemaVersion":1,"symbols":["abbrev"]},"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/abbrev@3.0.1"],"schemaVersion":1,"subject":"pkg:npm/abbrev@3.0.1","symbols":["abbrev"],"verifierAdapter":"node-typescript@1"}

{
  "name": "abbrev-sample",
  "version": "1.0.0",
  "lockfileVersion": 3,
  "requires": true,
  "packages": {
    "": {
      "name": "abbrev-sample",
      "version": "1.0.0",
      "dependencies": {
        "abbrev": "3.0.1"
      }
    },
    "node_modules/abbrev": {
      "version": "3.0.1",
      "resolved": "https://registry.npmjs.org/abbrev/-/abbrev-3.0.1.tgz",
      "integrity": "sha512-AO2ac6pjRB3SJmGJo+v5/aK6Omggp6fsLrs6wN9bd35ulu4cCwaAU9+7ZhXjeqHVkaHThLuzH0nZr0YpCDhygg==",
      "license": "ISC",
      "engines": {
        "node": "^18.17.0 || >=20.5.0"
      }
    }
  }
}

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

{
  "schemaVersion": 1,
  "goal": "verify pkg:npm/abbrev@3.0.1",
  "kind": "HOW",
  "packages": [
    "pkg:npm/abbrev@3.0.1"
  ]
}

import abbrev from 'abbrev'

export function buildAbbrevMap(words) {
  return abbrev(words)
}

export function resolveCommand(words, input) {
  const map = abbrev(words)
  return Object.prototype.hasOwnProperty.call(map, input) ? map[input] : null
}

export { abbrev }

import assert from 'node:assert/strict'
import { abbrev, buildAbbrevMap, resolveCommand } from '../src/index.mjs'

// 1. Array and variadic calls produce identical unambiguous prefix maps
const words = ['fool', 'foo', 'folding', 'flop']
const wordsCopy = [...words]
const fromArray = buildAbbrevMap(words)
const fromVariadic = abbrev('fool', 'foo', 'folding', 'flop')

assert.deepEqual(fromArray, {
  fl: 'flop',
  flo: 'flop',
  flop: 'flop',
  fol: 'folding',
  fold: 'folding',
  foldi: 'folding',
  foldin: 'folding',
  folding: 'folding',
  foo: 'foo',
  fool: 'fool'
})
assert.deepEqual(fromArray, fromVariadic)

// Passing a single array does not mutate the caller's array order
assert.deepEqual(words, wordsCopy)

// 2. Ambiguous prefixes ('f', 'fo') are omitted while exact prefix word 'foo' is preserved
assert.equal('f' in fromArray, false)
assert.equal('fo' in fromArray, false)
assert.equal(resolveCommand(words, 'fo'), null)
assert.equal(resolveCommand(words, 'foo'), 'foo')
assert.equal(resolveCommand(words, 'fool'), 'fool')
assert.equal(resolveCommand(words, 'fol'), 'folding')

// 3. Single string argument expands all prefixes of that word
assert.deepEqual(abbrev('ruby'), {
  r: 'ruby',
  ru: 'ruby',
  rub: 'ruby',
  ruby: 'ruby'
})

// 4. Duplicate words are deduplicated and non-string values are coerced via String()
assert.deepEqual(abbrev(['install', 'info', 'install']), {
  inf: 'info',
  info: 'info',
  ins: 'install',
  inst: 'install',
  insta: 'install',
  instal: 'install',
  install: 'install'
})

assert.deepEqual(abbrev([10, 100, { toString: () => '25' }]), {
  10: '10',
  100: '100',
  2: '25',
  25: '25'
})

// 5. Empty inputs return an empty object
assert.deepEqual(abbrev(), {})
assert.deepEqual(abbrev([]), {})