CodeSampleX

Sample

@npmcli/config 9.0.0

Verified sample for npm @npmcli/config 9.0.0. The contract ran on node 22 · linux debian/x64 · docker and passed: Calling config.get() before await…

sha256:7a848581a968b865c0b259867bd9c81b7c5c2d51d202bb6180775bc6dd675176

This network offers one thing: a sample that builds. It ran the sample in a sandbox and kept the signed receipt. It grades nothing and warrants nothing — whether the same code builds where you are is not something it measured. How many distinct signing keys filed a passing contract receipt. One is the author alone; more than one means somebody else built it too. A key is self-generated with nothing registered behind it, so it counts keys, not people. MIT-0

Execution evidence

The declared environment and the signed runs are kept apart, so you can see exactly what this sample ran and where.

Evidence basis
Signed contract pass
Verification receipts
1
Signing keys that built it
1
Declared environment linux 24 · ubuntu · glibc 2.39 x64 npm

Verification-run environments

Environment Contract Stages Run
node 22 · linux debian/x64 · docker ed25519:c1973797be207ac4 PASS compile:SKIPPED · contract:PASS · load:PASS · resolve:PASS
CONTAINER_RUN · node-typescript@1node:22@sha256:8a34c4ab3ea2…		 2026-10-21

Case

HOW
Goal
verify pkg:npm/%40npmcli/config@9.0.0
Packages
Created
2026-10-21T01:54:20Z

Contract

  1. Calling config.get() before await config.load() throws Error('call config.load() before reading values').
  2. After await config.load(), config.loaded is true and CLI shorthands (-s -> loglevel='silent'), CLI flags (--save-exact -> true), and npm_config_* environment variables (npm_config_tag -> tag='next') resolve according to layer precedence (cli > env > default).
  3. config.find(key) returns the active layer name ('cli', 'env', or 'default') and config.isDefault(key) returns true only when no higher-priority layer overrides the default definition.
  4. config.set('tag', 'beta', 'cli') overrides the env layer, invalidates cached config.flat so config.flat.defaultTag becomes 'beta', and config.delete('tag', 'cli') restores fallback to the env layer.

Files

  • PROMPT.md
  • csx.json
  • package-lock.json
  • package.json
  • spec.json
  • src/index.mjs
  • test/contract.mjs

Download the source artifact (tar.gz)

Source

PROMPT.md
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/%40npmcli/config@9.0.0
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:npm/%40npmcli/config@9.0.0

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.
csx.json
{"case":{"caseId":"case:sha256:f0d04b325318d24c7f8adf1b04eba089f6589473697869d09f6a29be7b66c6d2","contract":["Calling config.get() before await config.load() throws Error('call config.load() before reading values').","After await config.load(), config.loaded is true and CLI shorthands (-s -\u003e loglevel='silent'), CLI flags (--save-exact -\u003e true), and npm_config_* environment variables (npm_config_tag -\u003e tag='next') resolve according to layer precedence (cli \u003e env \u003e default).","config.find(key) returns the active layer name ('cli', 'env', or 'default') and config.isDefault(key) returns true only when no higher-priority layer overrides the default definition.","config.set('tag', 'beta', 'cli') overrides the env layer, invalidates cached config.flat so config.flat.defaultTag becomes 'beta', and config.delete('tag', 'cli') restores fallback to the env layer."],"goal":"verify pkg:npm/%40npmcli/config@9.0.0","kind":"HOW","packages":["pkg:npm/%40npmcli/config@9.0.0"],"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/%40npmcli/config@9.0.0"],"schemaVersion":1,"subject":"pkg:npm/%40npmcli/config@9.0.0","verifierAdapter":"node-typescript@1"}
package-lock.json
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      "dependencies": {
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        "is-fullwidth-code-point": "^3.0.0",
        "strip-ansi": "^6.0.1"
      },
      "engines": {
        "node": ">=8"
      }
    },
    "node_modules/wrap-ansi-cjs/node_modules/strip-ansi": {
      "version": "6.0.1",
      "resolved": "https://registry.npmjs.org/strip-ansi/-/strip-ansi-6.0.1.tgz",
      "integrity": "sha512-Y38VPSHcqkFrCpFnQ9vuSXmquuv5oXOKpGeT6aGrr3o3Gc9AlVa6JBfUSOCnbxGGZF+/0ooI7KrPuUSztUdU5A==",
      "license": "MIT",
      "dependencies": {
        "ansi-regex": "^5.0.1"
      },
      "engines": {
        "node": ">=8"
      }
    }
  }
}
package.json
{
  "name": "sample",
  "version": "1.0.0",
  "private": true,
  "type": "module",
  "scripts": {
    "test": "node test/contract.mjs"
  },
  "dependencies": {
    "@npmcli/config": "9.0.0"
  }
}
spec.json
{
  "schemaVersion": 1,
  "goal": "verify pkg:npm/%40npmcli/config@9.0.0",
  "kind": "HOW",
  "packages": [
    "pkg:npm/%40npmcli/config@9.0.0"
  ]
}
src/index.mjs
import Config from '@npmcli/config'
import definitionsModule from '@npmcli/config/lib/definitions/index.js'

const { definitions, shorthands, flatten } = definitionsModule

export async function createLoadedConfig({
  npmPath = process.cwd(),
  cwd = process.cwd(),
  argv = ['node', 'npm'],
  env = {},
} = {}) {
  const config = new Config({
    npmPath,
    definitions,
    shorthands,
    flatten,
    argv,
    env,
    cwd,
    excludeNpmCwd: true,
  })
  await config.load()
  return config
}

export { Config, definitions, shorthands, flatten }
test/contract.mjs
import assert from 'node:assert/strict'
import { mkdtempSync, rmSync } from 'node:fs'
import { tmpdir } from 'node:os'
import { join } from 'node:path'
import { Config, createLoadedConfig, definitions, shorthands, flatten } from '../src/index.mjs'

const tempDir = mkdtempSync(join(tmpdir(), 'npmcli-config-'))

try {
  // 1. Reading before load() throws an error
  const unloaded = new Config({
    npmPath: tempDir,
    definitions,
    shorthands,
    flatten,
    argv: ['node', 'npm'],
    env: { HOME: tempDir },
    cwd: tempDir,
  })
  assert.equal(unloaded.loaded, false)
  assert.throws(
    () => unloaded.get('tag'),
    /call config\.load\(\) before reading values/
  )

  // 2. Load configuration with CLI shorthand/flags and environment variables
  const config = await createLoadedConfig({
    npmPath: tempDir,
    cwd: tempDir,
    argv: ['node', 'npm', '-s', '--save-exact'],
    env: {
      HOME: tempDir,
      npm_config_tag: 'next',
    },
  })

  assert.equal(config.loaded, true)

  // CLI shorthand -s maps to --loglevel silent
  assert.equal(config.get('loglevel'), 'silent')
  assert.equal(config.find('loglevel'), 'cli')
  assert.equal(config.isDefault('loglevel'), false)

  // CLI boolean flag --save-exact
  assert.equal(config.get('save-exact'), true)
  assert.equal(config.find('save-exact'), 'cli')

  // Environment variable npm_config_tag maps to 'tag' in 'env' layer
  assert.equal(config.get('tag'), 'next')
  assert.equal(config.get('tag', 'env'), 'next')
  assert.equal(config.get('tag', 'default'), 'latest')
  assert.equal(config.find('tag'), 'env')
  assert.equal(config.isDefault('tag'), false)

  // Default layer value remains untouched for unset options
  assert.equal(config.isDefault('init-version'), true)
  assert.equal(config.get('init-version'), '1.0.0')
  assert.equal(config.find('init-version'), 'default')

  // 3. Mutating via set() and delete(), and inspecting flattened options
  config.set('tag', 'beta', 'cli')
  assert.equal(config.get('tag'), 'beta')
  assert.equal(config.find('tag'), 'cli')
  assert.equal(config.flat.defaultTag, 'beta')
  assert.equal(config.flat.savePrefix, '')

  config.delete('tag', 'cli')
  assert.equal(config.get('tag'), 'next')
  assert.equal(config.find('tag'), 'env')

  // 4. Validating configuration state
  assert.equal(config.validate(), true)
  assert.equal(config.valid, true)
} finally {
  rmSync(tempDir, { recursive: true, force: true })
}

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