CodeSampleX

Sample

@npmcli/map-workspaces 4.0.2: virtual

Verified sample for npm @npmcli/map-workspaces 4.0.2: virtual. The contract ran on node 22 · linux debian/x64 · docker and passed.

sha256:a7d73b75f8f3d40c7cb39ab0b9520503ca4bf603ac15c7f6052c30acaeb30ca6

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 node 22.23 linux 24 · ubuntu · glibc 2.39 x64 node 22.23 javascript npm 10

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…		 2026-10-18

Case

HOW
Goal
verify @npmcli/map-workspaces.virtual in pkg:npm/%40npmcli/map-workspaces@4.0.2
Packages
Symbols
  • @npmcli/map-workspaces.virtual
Environment
node 22.23.2
Created
2026-10-18T10:34:07Z

Contract

  1. mapWorkspaces.virtual({ lockfile, cwd }) synchronously returns a Map<string, string> mapping workspace package names (or folder names when package.name is omitted) to resolved paths under cwd.
  2. Negated workspace patterns (prefixed with '!') and '**/node_modules/**' entries in lockfile.packages are excluded from the returned Map.
  3. Supports both Array workspaces config and object-shaped { packages: string[] } workspaces config on lockfile.packages[''].
  4. Throws TypeError with code 'EMAPWORKSPACESLOCKFILE' when opts.lockfile is missing, and TypeError with code 'EWORKSPACESCONFIG' when workspaces is not an Array.

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 @npmcli/map-workspaces.virtual in pkg:npm/%40npmcli/map-workspaces@4.0.2
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:npm/%40npmcli/map-workspaces@4.0.2
Demonstrate these symbols/APIs:
  - @npmcli/map-workspaces.virtual

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:b5c84fb766c7dd588a1fb7565304ba26607340a388129ebf313999c8e6849845","contract":["mapWorkspaces.virtual({ lockfile, cwd }) synchronously returns a Map\u003cstring, string\u003e mapping workspace package names (or folder names when package.name is omitted) to resolved paths under cwd.","Negated workspace patterns (prefixed with '!') and '**/node_modules/**' entries in lockfile.packages are excluded from the returned Map.","Supports both Array workspaces config and object-shaped { packages: string[] } workspaces config on lockfile.packages[''].","Throws TypeError with code 'EMAPWORKSPACESLOCKFILE' when opts.lockfile is missing, and TypeError with code 'EWORKSPACESCONFIG' when workspaces is not an Array."],"goal":"verify @npmcli/map-workspaces.virtual in pkg:npm/%40npmcli/map-workspaces@4.0.2","kind":"HOW","packages":["pkg:npm/%40npmcli/map-workspaces@4.0.2"],"schemaVersion":1,"symbols":["@npmcli/map-workspaces.virtual"]},"contractCommand":["node","test/contract.mjs"],"environment":{"arch":"x64","distro":"ubuntu","ecosystem":"npm","executionContext":"node","language":"javascript","libc":"glibc","libcVersion":"2.39","moduleSystem":"esm","os":"linux","osVersionBucket":"24","packageManager":"npm","packageManagerVersion":"10.9.8","runtime":"node","runtimeVersion":"22.23.2","schemaVersion":1},"license":"MIT-0","packages":["pkg:npm/%40npmcli/map-workspaces@4.0.2"],"schemaVersion":1,"subject":"pkg:npm/%40npmcli/map-workspaces@4.0.2","symbols":["@npmcli/map-workspaces.virtual"],"verifierAdapter":"node-typescript@1"}
package-lock.json
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package.json
{
  "name": "map-workspaces-virtual-sample",
  "version": "1.0.0",
  "private": true,
  "type": "module",
  "scripts": {
    "test": "node test/contract.mjs"
  },
  "dependencies": {
    "@npmcli/map-workspaces": "4.0.2"
  }
}
spec.json
{
  "schemaVersion": 1,
  "goal": "verify @npmcli/map-workspaces.virtual in pkg:npm/%40npmcli/map-workspaces@4.0.2",
  "kind": "HOW",
  "packages": [
    "pkg:npm/%40npmcli/map-workspaces@4.0.2"
  ],
  "symbols": [
    "@npmcli/map-workspaces.virtual"
  ]
}
src/index.mjs
import mapWorkspaces from '@npmcli/map-workspaces';

export function resolveVirtualWorkspaces(lockfile, cwd) {
  return mapWorkspaces.virtual({ lockfile, cwd });
}
test/contract.mjs
import assert from 'node:assert/strict';
import path from 'node:path';
import mapWorkspaces from '@npmcli/map-workspaces';
import { resolveVirtualWorkspaces } from '../src/index.mjs';

const cwd = path.resolve('virtual-root');

// 1. Basic virtual workspace mapping with explicit package names and fallback folder names, plus negation
const lockfile = {
  packages: {
    '': {
      name: 'root-project',
      workspaces: ['packages/*', '!packages/ignored']
    },
    'packages/pkg-a': {
      name: '@scope/pkg-a',
      version: '1.0.0'
    },
    'packages/pkg-b': {
      version: '1.0.0'
    },
    'packages/ignored': {
      name: 'ignored-pkg',
      version: '1.0.0'
    },
    'node_modules/some-dep': {
      name: 'some-dep',
      version: '1.0.0'
    }
  }
};

const result = resolveVirtualWorkspaces(lockfile, cwd);
assert.ok(result instanceof Map, 'mapWorkspaces.virtual should return a Map instance');
assert.equal(result.size, 2);
assert.equal(result.get('@scope/pkg-a'), path.join(cwd, 'packages/pkg-a'));
assert.equal(result.get('pkg-b'), path.join(cwd, 'packages/pkg-b'));
assert.equal(result.has('ignored-pkg'), false);
assert.equal(result.has('some-dep'), false);

// 2. Object-form workspaces declaration ({ packages: [...] })
const objectWorkspacesResult = mapWorkspaces.virtual({
  cwd,
  lockfile: {
    packages: {
      '': {
        workspaces: {
          packages: ['apps/*']
        }
      },
      'apps/web': {
        name: 'web-app'
      }
    }
  }
});
assert.deepEqual(
  Array.from(objectWorkspacesResult.entries()),
  [['web-app', path.join(cwd, 'apps/web')]]
);

// 3. Empty workspaces returns an empty Map
const emptyResult = mapWorkspaces.virtual({
  cwd,
  lockfile: {
    packages: {
      '': {}
    }
  }
});
assert.ok(emptyResult instanceof Map);
assert.equal(emptyResult.size, 0);

// 4. Missing lockfile option throws EMAPWORKSPACESLOCKFILE TypeError
assert.throws(
  () => mapWorkspaces.virtual({}),
  (err) => err instanceof TypeError && err.code === 'EMAPWORKSPACESLOCKFILE'
);

// 5. Invalid workspaces config throws EWORKSPACESCONFIG TypeError
assert.throws(
  () =>
    mapWorkspaces.virtual({
      cwd,
      lockfile: {
        packages: {
          '': {
            workspaces: 'invalid-not-an-array'
          }
        }
      }
    }),
  (err) => err instanceof TypeError && err.code === 'EWORKSPACESCONFIG'
);

Origin Seeder

anonymous