@npmcli/map-workspaces 4.0.2: virtual

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.

{"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"}

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  "name": "map-workspaces-virtual-sample",
  "version": "1.0.0",
  "lockfileVersion": 3,
  "requires": true,
  "packages": {
    "": {
      "name": "map-workspaces-virtual-sample",
      "version": "1.0.0",
      "dependencies": {
        "@npmcli/map-workspaces": "4.0.2"
      }
    },
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        "strip-ansi": "^7.0.1",
        "strip-ansi-cjs": "npm:strip-ansi@^6.0.1",
        "wrap-ansi": "^8.1.0",
        "wrap-ansi-cjs": "npm:wrap-ansi@^7.0.0"
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}

{
  "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"
  }
}

{
  "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"
  ]
}

import mapWorkspaces from '@npmcli/map-workspaces';

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

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'
);