builder-util-runtime 9.7.0

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/builder-util-runtime@9.7.0
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:npm/builder-util-runtime@9.7.0

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.

{"case":{"caseId":"case:sha256:d63f34a45e66d20e494a9afa0f5411925e90465daa0ba0959046885aac1ced32","contract":["CancellationToken tracks cancelled state and propagates cancellation from parent tokens to child tokens","CancellationToken.createPromise resolves successfully or rejects with CancellationError when cancelled","parseXml parses XML hierarchy, attributes, and CDATA blocks into navigable XElement trees","UUID v5 generates deterministic RFC 4122 v5 UUIDs from namespace and name inputs","deepAssign recursively merges object properties and deduplicates arrays while ignoring prototype pollution keys","parseDn and mapToObject parse RFC 2253 distinguished name strings into key-value maps and plain objects","objectToArgs and asArray helper utilities transform parameters safely","MemoLazy lazily computes and memoizes values based on selector cache invalidation"],"goal":"verify pkg:npm/builder-util-runtime@9.7.0","kind":"HOW","packages":["pkg:npm/builder-util-runtime@9.7.0"],"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/builder-util-runtime@9.7.0"],"schemaVersion":1,"subject":"pkg:npm/builder-util-runtime@9.7.0","verifierAdapter":"node-typescript@1"}

{
  "name": "sample-builder-util-runtime",
  "version": "1.0.0",
  "lockfileVersion": 3,
  "requires": true,
  "packages": {
    "": {
      "name": "sample-builder-util-runtime",
      "version": "1.0.0",
      "dependencies": {
        "builder-util-runtime": "9.7.0"
      }
    },
    "node_modules/builder-util-runtime": {
      "version": "9.7.0",
      "resolved": "https://registry.npmjs.org/builder-util-runtime/-/builder-util-runtime-9.7.0.tgz",
      "integrity": "sha512-g/kR520giAFYkSXTzcmF3kqQq7wi8F6N6SzeDgZrqTBN+VHdmgWOyTdD1yD7AATDId/yXLvuP34CxW46/BwCdw==",
      "license": "MIT",
      "dependencies": {
        "debug": "^4.3.4",
        "sax": "^1.2.4"
      },
      "engines": {
        "node": ">=12.0.0"
      }
    },
    "node_modules/debug": {
      "version": "4.4.3",
      "resolved": "https://registry.npmjs.org/debug/-/debug-4.4.3.tgz",
      "integrity": "sha512-RGwwWnwQvkVfavKVt22FGLw+xYSdzARwm0ru6DhTVA3umU5hZc28V3kO4stgYryrTlLpuvgI9GiijltAjNbcqA==",
      "license": "MIT",
      "dependencies": {
        "ms": "^2.1.3"
      },
      "engines": {
        "node": ">=6.0"
      },
      "peerDependenciesMeta": {
        "supports-color": {
          "optional": true
        }
      }
    },
    "node_modules/ms": {
      "version": "2.1.3",
      "resolved": "https://registry.npmjs.org/ms/-/ms-2.1.3.tgz",
      "integrity": "sha512-6FlzubTLZG3J2a/NVCAleEhjzq5oxgHyaCU9yYXvcLsvoVaHJq/s5xXI6/XXP6tz7R9xAOtHnSO/tXtF3WRTlA==",
      "license": "MIT"
    },
    "node_modules/sax": {
      "version": "1.6.1",
      "resolved": "https://registry.npmjs.org/sax/-/sax-1.6.1.tgz",
      "integrity": "sha512-42tBVwLWnaQvW5zc4HbZrTuWccECCZfBi92FDuwtqxasH+JbPB3/FOKb1m222K42R4WxuxzzMsTswfzgtSu64Q==",
      "license": "BlueOak-1.0.0",
      "engines": {
        "node": ">=11.0.0"
      }
    }
  }
}

{
  "name": "sample-builder-util-runtime",
  "version": "1.0.0",
  "type": "module",
  "private": true,
  "dependencies": {
    "builder-util-runtime": "9.7.0"
  }
}

{
  "schemaVersion": 1,
  "goal": "verify pkg:npm/builder-util-runtime@9.7.0",
  "kind": "HOW",
  "packages": [
    "pkg:npm/builder-util-runtime@9.7.0"
  ]
}

import assert from 'node:assert/strict';
import {
  CancellationToken,
  CancellationError,
  parseXml,
  XElement,
  UUID,
  deepAssign,
  asArray,
  objectToArgs,
  MemoLazy,
  parseDn,
  mapToObject,
} from 'builder-util-runtime';

// 1. CancellationToken tracks cancelled state and propagates cancellation from parent tokens to child tokens
{
  const parent = new CancellationToken();
  const child = new CancellationToken(parent);

  assert.equal(parent.cancelled, false);
  assert.equal(child.cancelled, false);

  let childCancelledFired = false;
  child.onCancel(() => {
    childCancelledFired = true;
  });

  parent.cancel();
  assert.equal(parent.cancelled, true);
  assert.equal(child.cancelled, true);
  assert.equal(childCancelledFired, true);

  let immediateCalled = false;
  child.onCancel(() => {
    immediateCalled = true;
  });
  assert.equal(immediateCalled, true);
}

// 2. CancellationToken.createPromise resolves successfully or rejects with CancellationError when cancelled
{
  const token = new CancellationToken();
  let cancelCleanupCalled = false;

  const promise = token.createPromise((resolve, _reject, onCancel) => {
    const timer = setTimeout(() => resolve('done'), 500);
    onCancel(() => {
      clearTimeout(timer);
      cancelCleanupCalled = true;
    });
  });

  token.cancel();
  await assert.rejects(promise, (err) => {
    assert.ok(err instanceof CancellationError);
    assert.equal(err.message, 'cancelled');
    return true;
  });
  assert.equal(cancelCleanupCalled, true);

  const alreadyCancelledToken = new CancellationToken();
  alreadyCancelledToken.cancel();
  await assert.rejects(
    alreadyCancelledToken.createPromise((resolve) => resolve('success')),
    CancellationError
  );
}

// 3. parseXml parses XML hierarchy, attributes, and CDATA blocks into navigable XElement trees
{
  const xmlData = `
    <root id="123" type="sample">
      <title>Test Project</title>
      <description><![CDATA[Some <cdata> content & symbols]]></description>
      <items>
        <item code="A">First</item>
        <item code="B">Second</item>
      </items>
    </root>
  `;

  const root = parseXml(xmlData);
  assert.ok(root instanceof XElement);
  assert.equal(root.name, 'root');
  assert.equal(root.attribute('id'), '123');
  assert.equal(root.attribute('type'), 'sample');

  assert.throws(() => root.attribute('missing'), {
    code: 'ERR_XML_MISSED_ATTRIBUTE',
  });

  const title = root.element('title');
  assert.equal(title.value, 'Test Project');

  const desc = root.element('description');
  assert.equal(desc.value, 'Some <cdata> content & symbols');
  assert.equal(desc.isCData, true);

  const items = root.element('items');
  const itemList = items.getElements('item');
  assert.equal(itemList.length, 2);
  assert.equal(itemList[0].attribute('code'), 'A');
  assert.equal(itemList[0].value, 'First');
  assert.equal(itemList[1].attribute('code'), 'B');
  assert.equal(itemList[1].value, 'Second');

  assert.equal(root.elementValueOrEmpty('nonexistent'), '');
  assert.throws(() => root.element('nonexistent'), {
    code: 'ERR_XML_MISSED_ELEMENT',
  });
}

// 4. UUID v5 generates deterministic RFC 4122 v5 UUIDs from namespace and name inputs
{
  const namespace = UUID.parse('6ba7b810-9dad-11d1-80b4-00c04fd430c8');
  const generated1 = UUID.v5('example.com', namespace);
  const generated2 = UUID.v5('example.com', namespace);

  assert.equal(generated1.toString(), generated2.toString());
  assert.equal(typeof generated1.toString(), 'string');

  const checkResult = UUID.check(generated1.toString());
  assert.ok(checkResult !== false);
  assert.equal(checkResult.version, 5);
  assert.equal(checkResult.variant, 'rfc4122');
  assert.equal(checkResult.format, 'ascii');
}

// 5. deepAssign recursively merges object properties and deduplicates arrays while ignoring prototype pollution keys
{
  const target = {
    a: 1,
    nested: { x: 'original', y: 10 },
    arr: [1, 2],
  };

  const source1 = {
    nested: { y: 20, z: true },
    arr: [2, 3],
  };

  const source2 = {
    b: 'added',
    arr: [3, 4],
  };

  const result = deepAssign(target, source1, source2);
  assert.equal(result, target);
  assert.deepEqual(result, {
    a: 1,
    nested: { x: 'original', y: 20, z: true },
    arr: [1, 2, 3, 4],
    b: 'added',
  });

  const polluted = JSON.parse('{"__proto__": {"polluted": true}}');
  deepAssign({}, polluted);
  assert.equal(({}).polluted, undefined);
}

// 6. parseDn and mapToObject parse RFC 2253 distinguished name strings into key-value maps and plain objects
{
  const dnMap = parseDn('CN="Sample Developer", OU=Engineering, O=Example, C=US');
  assert.equal(dnMap.get('CN'), 'Sample Developer');
  assert.equal(dnMap.get('OU'), 'Engineering');
  assert.equal(dnMap.get('O'), 'Example');
  assert.equal(dnMap.get('C'), 'US');

  const dnObj = mapToObject(dnMap);
  assert.deepEqual(dnObj, {
    CN: 'Sample Developer',
    OU: 'Engineering',
    O: 'Example',
    C: 'US',
  });
}

// 7. objectToArgs and asArray helper utilities transform parameters safely
{
  assert.deepEqual(asArray(null), []);
  assert.deepEqual(asArray(undefined), []);
  assert.deepEqual(asArray('single'), ['single']);
  assert.deepEqual(asArray(['a', 'b']), ['a', 'b']);

  const args = objectToArgs({
    arch: 'x64',
    target: 'zip',
    empty: null,
  });
  assert.deepEqual(args, ['--arch', 'x64', '--target', 'zip']);
}

// 8. MemoLazy lazily computes and memoizes values based on selector cache invalidation
{
  let creatorCalls = 0;
  let currentConfig = 'v1';
  const lazy = new MemoLazy(
    () => currentConfig,
    (cfg) => {
      creatorCalls++;
      return { version: cfg, parsed: true };
    }
  );

  assert.equal(lazy.hasValue, false);
  assert.equal(creatorCalls, 0);

  const val1 = lazy.value;
  assert.equal(creatorCalls, 1);
  assert.equal(lazy.hasValue, true);
  assert.deepEqual(val1, { version: 'v1', parsed: true });

  const val2 = lazy.value;
  assert.equal(creatorCalls, 1);
  assert.equal(val1, val2);

  currentConfig = 'v2';
  const val3 = lazy.value;
  assert.equal(creatorCalls, 2);
  assert.deepEqual(val3, { version: 'v2', parsed: true });
}