CodeSampleX

Sample

@npmcli/map-workspaces 4.0.2: mapWorkspaces, mapWorkspaces.virtual

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

sha256:7740fc4ce57c4bd28bcb32acf213c75a1f2a7e7343041636dae962e44ae9f029

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 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 pkg:npm/%40npmcli/map-workspaces@4.0.2
Packages
Symbols
  • mapWorkspaces
  • mapWorkspaces.virtual
Environment
node 22.23
Created
2026-10-18T08:53:07Z

Contract

  1. mapWorkspaces({ cwd, pkg }) resolves workspace glob patterns (both array and { packages: [...] } forms), respects negated patterns (!pattern), falls back to folder name when package.json omits name, and returns a Map<packageName, directoryPathname> in pattern declaration order
  2. mapWorkspaces rejects with Error code EDUPLICATEWORKSPACE when multiple workspace directories share the same package name
  3. mapWorkspaces rejects with TypeError code EMAPWORKSPACESPKG when opts.pkg is missing and TypeError code EWORKSPACESCONFIG when workspaces is not an Array
  4. mapWorkspaces.virtual({ cwd, lockfile }) synchronously maps workspace entries from a lockfile packages object into a Map<packageName, directoryPathname> and throws TypeError code EMAPWORKSPACESLOCKFILE when opts.lockfile is missing

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/map-workspaces@4.0.2
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:npm/%40npmcli/map-workspaces@4.0.2

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:sha256:42f7bd5cd675a7a7d0c61d5ea414cb0000bd3a95aef8a016a207a78e1b62358d","contract":["mapWorkspaces({ cwd, pkg }) resolves workspace glob patterns (both array and { packages: [...] } forms), respects negated patterns (!pattern), falls back to folder name when package.json omits name, and returns a Map\u003cpackageName, directoryPathname\u003e in pattern declaration order","mapWorkspaces rejects with Error code EDUPLICATEWORKSPACE when multiple workspace directories share the same package name","mapWorkspaces rejects with TypeError code EMAPWORKSPACESPKG when opts.pkg is missing and TypeError code EWORKSPACESCONFIG when workspaces is not an Array","mapWorkspaces.virtual({ cwd, lockfile }) synchronously maps workspace entries from a lockfile packages object into a Map\u003cpackageName, directoryPathname\u003e and throws TypeError code EMAPWORKSPACESLOCKFILE when opts.lockfile is missing"],"goal":"verify pkg:npm/%40npmcli/map-workspaces@4.0.2","kind":"HOW","packages":["pkg:npm/%40npmcli/map-workspaces@4.0.2"],"schemaVersion":1,"symbols":["mapWorkspaces","mapWorkspaces.virtual"]},"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","packageManagerVersion":"10.9","runtime":"node","runtimeVersion":"22.23","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":["mapWorkspaces","mapWorkspaces.virtual"],"verifierAdapter":"node-typescript@1"}
package-lock.json
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package.json
{
  "name": "verify-map-workspaces",
  "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 pkg:npm/%40npmcli/map-workspaces@4.0.2",
  "kind": "HOW",
  "packages": [
    "pkg:npm/%40npmcli/map-workspaces@4.0.2"
  ]
}
src/index.mjs
import mapWorkspaces from '@npmcli/map-workspaces';

export async function discoverWorkspaces(cwd, pkg, ignore = []) {
  return mapWorkspaces({ cwd, pkg, ignore });
}

export function discoverVirtualWorkspaces(cwd, lockfile) {
  return mapWorkspaces.virtual({ cwd, lockfile });
}

export { mapWorkspaces };
test/contract.mjs
import assert from 'node:assert/strict';
import fs from 'node:fs/promises';
import os from 'node:os';
import path from 'node:path';
import mapWorkspaces from '@npmcli/map-workspaces';
import { discoverWorkspaces, discoverVirtualWorkspaces } from '../src/index.mjs';

const tmpRoot = await fs.mkdtemp(path.join(os.tmpdir(), 'map-ws-test-'));

try {
  // 1. Setup workspace directories on disk
  const pkgADir = path.join(tmpRoot, 'packages', 'pkg-a');
  const pkgBDir = path.join(tmpRoot, 'packages', 'pkg-b');
  const pkgIgnoredDir = path.join(tmpRoot, 'packages', 'pkg-ignored');
  const unnamedDir = path.join(tmpRoot, 'plugins', 'my-plugin');

  await fs.mkdir(pkgADir, { recursive: true });
  await fs.mkdir(pkgBDir, { recursive: true });
  await fs.mkdir(pkgIgnoredDir, { recursive: true });
  await fs.mkdir(unnamedDir, { recursive: true });

  await fs.writeFile(
    path.join(pkgADir, 'package.json'),
    JSON.stringify({ name: '@scope/pkg-a', version: '1.0.0' })
  );
  await fs.writeFile(
    path.join(pkgBDir, 'package.json'),
    JSON.stringify({ name: 'pkg-b', version: '1.0.0' })
  );
  await fs.writeFile(
    path.join(pkgIgnoredDir, 'package.json'),
    JSON.stringify({ name: 'pkg-ignored', version: '1.0.0' })
  );
  // Unnamed package derives its name from folder via @npmcli/name-from-folder
  await fs.writeFile(
    path.join(unnamedDir, 'package.json'),
    JSON.stringify({ version: '1.0.0' })
  );

  // 2. Basic workspace discovery with array config + negated pattern + unnamed package fallback
  const map1 = await discoverWorkspaces(tmpRoot, {
    workspaces: ['packages/*', '!packages/pkg-ignored', 'plugins/*']
  });
  assert.ok(map1 instanceof Map);
  assert.deepEqual(
    Array.from(map1.entries()),
    [
      ['@scope/pkg-a', pkgADir],
      ['pkg-b', pkgBDir],
      ['my-plugin', unnamedDir]
    ]
  );

  // 3. Object-style `{ packages: [...] }` workspaces declaration
  const map2 = await mapWorkspaces({
    cwd: tmpRoot,
    pkg: {
      workspaces: {
        packages: ['plugins/*', 'packages/pkg-a']
      }
    }
  });
  assert.deepEqual(
    Array.from(map2.keys()),
    ['my-plugin', '@scope/pkg-a']
  );

  // 4. Empty workspaces returns an empty Map
  const emptyMap = await mapWorkspaces({
    cwd: tmpRoot,
    pkg: {}
  });
  assert.equal(emptyMap.size, 0);

  // 5. Duplicate workspace package name throws EDUPLICATEWORKSPACE
  const dupDir = path.join(tmpRoot, 'dup', 'pkg-b-copy');
  await fs.mkdir(dupDir, { recursive: true });
  await fs.writeFile(
    path.join(dupDir, 'package.json'),
    JSON.stringify({ name: 'pkg-b', version: '2.0.0' })
  );
  await assert.rejects(
    () =>
      mapWorkspaces({
        cwd: tmpRoot,
        pkg: { workspaces: ['packages/pkg-b', 'dup/*'] }
      }),
    (err) => err instanceof Error && err.code === 'EDUPLICATEWORKSPACE'
  );

  // 6. Error codes for missing pkg or invalid workspaces config
  await assert.rejects(
    () => mapWorkspaces({ cwd: tmpRoot }),
    (err) => err instanceof TypeError && err.code === 'EMAPWORKSPACESPKG'
  );
  await assert.rejects(
    () => mapWorkspaces({ cwd: tmpRoot, pkg: { workspaces: 'invalid-string' } }),
    (err) => err instanceof TypeError && err.code === 'EWORKSPACESCONFIG'
  );

  // 7. Virtual workspace mapping from lockfile object without filesystem I/O
  const virtualMap = discoverVirtualWorkspaces(tmpRoot, {
    packages: {
      '': {
        name: 'root',
        workspaces: ['packages/*', '!packages/pkg-ignored']
      },
      'packages/pkg-a': {
        name: '@scope/pkg-a',
        version: '1.0.0'
      },
      'packages/pkg-b': {
        version: '1.0.0'
      },
      'packages/pkg-ignored': {
        name: 'pkg-ignored',
        version: '1.0.0'
      }
    }
  });
  assert.ok(virtualMap instanceof Map);
  assert.deepEqual(
    Array.from(virtualMap.entries()),
    [
      ['@scope/pkg-a', path.join(tmpRoot, 'packages/pkg-a')],
      ['pkg-b', path.join(tmpRoot, 'packages/pkg-b')]
    ]
  );

  // 8. Missing lockfile in mapWorkspaces.virtual throws EMAPWORKSPACESLOCKFILE
  assert.throws(
    () => mapWorkspaces.virtual({ cwd: tmpRoot }),
    (err) => err instanceof TypeError && err.code === 'EMAPWORKSPACESLOCKFILE'
  );
} finally {
  await fs.rm(tmpRoot, { recursive: true, force: true });
}

Origin Seeder

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