p-map 7.1.1: pMapSettled

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 p-map.pMapSettled in pkg:npm/p-map@7.1.1
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:npm/p-map@7.1.1
Demonstrate these symbols/APIs:
  - p-map.pMapSettled

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:cb971b1a4e44473fe9fff13ec7bc010c478177a0311b90111822f7935bfc84d1","contract":["assert pMapSettled maps elements concurrently within concurrency limit and returns fulfilled and rejected result objects in input order","assert pMapSettled records rejected input promises as rejected status objects without invoking mapper","assert pMapSettled omits elements when mapper returns pMapSkip","assert pMapSettled stops iteration when mapper returns pMapStop and preserves earlier fulfilled and rejected results","assert pMapSettled rejects when the provided AbortSignal is aborted"],"goal":"verify p-map.pMapSettled in pkg:npm/p-map@7.1.1","kind":"HOW","packages":["pkg:npm/p-map@7.1.1"],"schemaVersion":1,"symbols":["p-map.pMapSettled"]},"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/p-map@7.1.1"],"schemaVersion":1,"subject":"pkg:npm/p-map@7.1.1","symbols":["p-map.pMapSettled"],"verifierAdapter":"node-typescript@1"}

import { pMapSettled, pMapSkip, pMapStop } from 'p-map';

/**
 * Maps an iterable concurrently and settles all element outcomes.
 *
 * @param {Iterable<unknown> | AsyncIterable<unknown>} input - Input iterable.
 * @param {(element: any, index: number) => unknown} mapper - Mapper function.
 * @param {import('p-map').SettledOptions} [options] - Concurrency and abort signal options.
 * @returns {Promise<PromiseSettledResult<any>[]>} Array of settled results in input order.
 */
export async function settleConcurrently(input, mapper, options) {
  return pMapSettled(input, mapper, options);
}

export { pMapSettled, pMapSkip, pMapStop };

{
  "name": "sample-p-map-settled",
  "version": "1.0.0",
  "lockfileVersion": 3,
  "requires": true,
  "packages": {
    "": {
      "name": "sample-p-map-settled",
      "version": "1.0.0",
      "license": "MIT-0",
      "dependencies": {
        "p-map": "7.1.1"
      }
    },
    "node_modules/p-map": {
      "version": "7.1.1",
      "resolved": "https://registry.npmjs.org/p-map/-/p-map-7.1.1.tgz",
      "integrity": "sha512-6Lh3jQPLthYujSrlw6ccWXBGZTkoTCz27Hd92g79LH/kjAbgoEu0t442cCCNbegPSJsA0lwDX8z0bcKtkpA32g==",
      "license": "MIT",
      "engines": {
        "node": ">=18"
      },
      "funding": {
        "url": "https://github.com/sponsors/sindresorhus"
      }
    }
  }
}

{
  "name": "sample-p-map-settled",
  "version": "1.0.0",
  "description": "Clean-room sample verifying p-map.pMapSettled functionality",
  "type": "module",
  "main": "index.js",
  "license": "MIT-0",
  "scripts": {
    "test": "node test/contract.mjs"
  },
  "dependencies": {
    "p-map": "7.1.1"
  }
}

{
  "schemaVersion": 1,
  "goal": "verify p-map.pMapSettled in pkg:npm/p-map@7.1.1",
  "kind": "HOW",
  "packages": [
    "pkg:npm/p-map@7.1.1"
  ],
  "symbols": [
    "p-map.pMapSettled"
  ]
}

import assert from 'node:assert/strict';
import { pMapSettled, pMapSkip, pMapStop, settleConcurrently } from '../index.js';

// 1. Maps fulfilled and rejected mapper outcomes in input order with bounded concurrency
let active = 0;
let maxActive = 0;
const mixedResults = await settleConcurrently(
  [10, 20, 30, 40],
  async (value, index) => {
    active++;
    maxActive = Math.max(maxActive, active);
    await new Promise(resolve => setTimeout(resolve, 10));
    active--;
    if (value === 20) {
      throw new Error(`failed at index ${index}`);
    }
    return value * 2;
  },
  { concurrency: 2 }
);

assert.ok(maxActive <= 2, 'concurrency must not exceed configured limit of 2');
assert.equal(mixedResults.length, 4);
assert.deepEqual(mixedResults[0], { status: 'fulfilled', value: 20 });
assert.equal(mixedResults[1].status, 'rejected');
assert.equal(mixedResults[1].reason.message, 'failed at index 1');
assert.deepEqual(mixedResults[2], { status: 'fulfilled', value: 60 });
assert.deepEqual(mixedResults[3], { status: 'fulfilled', value: 80 });

// 2. Rejected input promises produce rejected result entries without calling mapper
const seenElements = [];
const inputWithRejection = [
  Promise.resolve('alpha'),
  Promise.reject(new Error('input promise rejected')),
  Promise.resolve('gamma')
];

const inputRejectionResults = await pMapSettled(inputWithRejection, async element => {
  seenElements.push(element);
  return element.toUpperCase();
});

assert.deepEqual(seenElements, ['alpha', 'gamma']);
assert.equal(inputRejectionResults.length, 3);
assert.deepEqual(inputRejectionResults[0], { status: 'fulfilled', value: 'ALPHA' });
assert.equal(inputRejectionResults[1].status, 'rejected');
assert.equal(inputRejectionResults[1].reason.message, 'input promise rejected');
assert.deepEqual(inputRejectionResults[2], { status: 'fulfilled', value: 'GAMMA' });

// 3. pMapSkip omits skipped elements from settled results
const skipResults = await pMapSettled([1, 2, 3, 4], async value => {
  if (value % 2 === 0) {
    return pMapSkip;
  }
  return value * 10;
});

assert.deepEqual(skipResults, [
  { status: 'fulfilled', value: 10 },
  { status: 'fulfilled', value: 30 }
]);

// 4. pMapStop stops iteration early and preserves earlier fulfilled and rejected results
const stopResults = await pMapSettled(
  ['ok', 'fail', 'stop', 'unreachable'],
  async item => {
    if (item === 'fail') {
      throw new Error('early error');
    }
    if (item === 'stop') {
      return pMapStop;
    }
    return item;
  },
  { concurrency: 1 }
);

assert.equal(stopResults.length, 2);
assert.deepEqual(stopResults[0], { status: 'fulfilled', value: 'ok' });
assert.equal(stopResults[1].status, 'rejected');
assert.equal(stopResults[1].reason.message, 'early error');

// 5. Aborting via AbortSignal rejects the returned promise
const abortController = new AbortController();
abortController.abort(new Error('operation aborted'));

await assert.rejects(
  () => pMapSettled([1, 2], async x => x, { signal: abortController.signal }),
  { message: 'operation aborted' }
);