CodeSampleX

Sample

got 11.8.6: extend

Verified sample for npm got 11.8.6: extend. The contract ran on node 22 · linux debian/x64 · docker and passed: got.extend returns a callable Got client…

sha256:ebfed1788b3720fcf5a58bcfc06936387515a6e0e52de93aef1704c814b5f631

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…		 2026-09-05

Case

HOW
Goal
verify got.extend in pkg:npm/got@11.8.6
Packages
Symbols
  • got.extend
Environment
node 22.23.2
Created
2026-09-05T22:07:47Z

Contract

  1. got.extend returns a callable Got client instance configured with defaults
  2. got.extend merges multiple option objects into defaults
  3. got.extend instances support chained extension with inherited and overridden options
  4. got.extend preserves immutability of parent client instances when extending
  5. got.extend sends HTTP requests with extended prefixUrl and custom headers
  6. createJsonApiClient helper automatically parses JSON response bodies
  7. got.extend throws TypeError when options argument is not an object

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 got.extend in pkg:npm/got@11.8.6
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:npm/got@11.8.6
Demonstrate these symbols/APIs:
  - got.extend

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:sha256:9a3d072135f7923ceb3009391632a41928a4c9cfdbf4cb633d177cabc8d3adf8","contract":["got.extend returns a callable Got client instance configured with defaults","got.extend merges multiple option objects into defaults","got.extend instances support chained extension with inherited and overridden options","got.extend preserves immutability of parent client instances when extending","got.extend sends HTTP requests with extended prefixUrl and custom headers","createJsonApiClient helper automatically parses JSON response bodies","got.extend throws TypeError when options argument is not an object"],"goal":"verify got.extend in pkg:npm/got@11.8.6","kind":"HOW","packages":["pkg:npm/got@11.8.6"],"schemaVersion":1,"symbols":["got.extend"]},"contractCommand":["node","test/contract.mjs"],"environment":{"arch":"x64","distro":"ubuntu","ecosystem":"npm","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/got@11.8.6"],"schemaVersion":1,"subject":"pkg:npm/got@11.8.6","symbols":["got.extend"],"verifierAdapter":"node-typescript@1"}
package-lock.json
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}
package.json
{
  "name": "sample-got-extend",
  "version": "1.0.0",
  "type": "module",
  "private": true,
  "license": "MIT-0",
  "scripts": {
    "test": "node test/contract.mjs"
  },
  "dependencies": {
    "got": "11.8.6"
  }
}
spec.json
{
  "schemaVersion": 1,
  "goal": "verify got.extend in pkg:npm/got@11.8.6",
  "kind": "HOW",
  "packages": [
    "pkg:npm/got@11.8.6"
  ],
  "symbols": [
    "got.extend"
  ]
}
src/index.mjs
import got from 'got';

/**
 * Creates an extended got instance with the provided options.
 * @param {...object} options Option objects to extend got with.
 * @returns {Function} Extended got client.
 */
export function createClient(...options) {
  return got.extend(...options);
}

/**
 * Creates an extended got instance preconfigured for JSON APIs with a base URL.
 * @param {string|URL} prefixUrl Base URL for the API.
 * @param {object} [defaultHeaders={}] Default headers to include.
 * @returns {Function} Extended got client for JSON API.
 */
export function createJsonApiClient(prefixUrl, defaultHeaders = {}) {
  return got.extend({
    prefixUrl,
    headers: defaultHeaders,
    responseType: 'json'
  });
}

export { got };
export default got;
test/contract.mjs
import assert from 'node:assert/strict';
import http from 'node:http';
import got, { createClient, createJsonApiClient } from '../src/index.mjs';

// 1. got.extend returns a callable Got client instance configured with defaults
{
  const client = got.extend({
    prefixUrl: 'http://127.0.0.1:8080/api',
    headers: {
      'x-custom-default': 'default-value'
    }
  });

  assert.equal(typeof client, 'function', 'client should be a function');
  assert.equal(typeof client.extend, 'function', 'client.extend should be a function');
  assert.equal(typeof client.get, 'function', 'client.get should be a function');
  assert.equal(typeof client.post, 'function', 'client.post should be a function');
  assert.equal(client.defaults.options.prefixUrl.toString(), 'http://127.0.0.1:8080/api/');
  assert.equal(client.defaults.options.headers['x-custom-default'], 'default-value');
}

// 2. got.extend merges multiple option objects into defaults
{
  const client = got.extend(
    { headers: { 'x-first': 'first' } },
    { headers: { 'x-second': 'second' }, timeout: { request: 3000 } }
  );

  assert.equal(client.defaults.options.headers['x-first'], 'first');
  assert.equal(client.defaults.options.headers['x-second'], 'second');
  assert.equal(client.defaults.options.timeout.request, 3000);
}

// 3. got.extend instances support chained extension with inherited and overridden options
{
  const parent = got.extend({
    prefixUrl: 'http://127.0.0.1:8080/v1',
    headers: {
      'x-common': 'parent-value',
      'x-override': 'initial'
    }
  });

  const child = parent.extend({
    prefixUrl: 'http://127.0.0.1:8080/v2',
    headers: {
      'x-override': 'updated',
      'x-child': 'child-only'
    }
  });

  assert.equal(child.defaults.options.prefixUrl.toString(), 'http://127.0.0.1:8080/v2/');
  assert.equal(child.defaults.options.headers['x-common'], 'parent-value');
  assert.equal(child.defaults.options.headers['x-override'], 'updated');
  assert.equal(child.defaults.options.headers['x-child'], 'child-only');
}

// 4. got.extend preserves immutability of parent client instances when extending
{
  const parentHeaders = { 'x-immutable': 'true' };
  const parent = got.extend({ headers: parentHeaders });

  const child = parent.extend({
    headers: {
      'x-immutable': 'mutated',
      'x-extra': 'added'
    }
  });

  assert.equal(parent.defaults.options.headers['x-immutable'], 'true');
  assert.equal(parent.defaults.options.headers['x-extra'], undefined);
  assert.equal(child.defaults.options.headers['x-immutable'], 'mutated');
  assert.equal(child.defaults.options.headers['x-extra'], 'added');
}

// Set up a local HTTP server for network execution contracts
const requests = [];
const server = http.createServer((req, res) => {
  requests.push({
    method: req.method,
    url: req.url,
    headers: req.headers
  });

  if (req.url === '/v1/items') {
    res.writeHead(200, { 'Content-Type': 'application/json' });
    res.end(JSON.stringify([{ id: 1, name: 'item1' }]));
  } else if (req.url === '/v1/data') {
    res.writeHead(200, { 'Content-Type': 'text/plain' });
    res.end('ok');
  } else {
    res.writeHead(404);
    res.end('Not Found');
  }
});

await new Promise((resolve) => server.listen(0, '127.0.0.1', resolve));
const port = server.address().port;
const baseUrl = `http://127.0.0.1:${port}/v1`;

try {
  // 5. got.extend sends HTTP requests with extended prefixUrl and custom headers
  {
    const client = createClient({
      prefixUrl: baseUrl,
      headers: {
        'x-client-id': 'extended-client',
        'x-trace-id': 'trace-123'
      }
    });

    const response = await client.get('data');
    assert.equal(response.statusCode, 200);
    assert.equal(response.body, 'ok');

    const lastReq = requests[requests.length - 1];
    assert.equal(lastReq.method, 'GET');
    assert.equal(lastReq.url, '/v1/data');
    assert.equal(lastReq.headers['x-client-id'], 'extended-client');
    assert.equal(lastReq.headers['x-trace-id'], 'trace-123');
  }

  // 6. createJsonApiClient helper automatically parses JSON response bodies
  {
    const apiClient = createJsonApiClient(baseUrl, { 'x-json-api': 'test' });
    const response = await apiClient.get('items');
    assert.equal(response.statusCode, 200);
    assert.deepEqual(response.body, [{ id: 1, name: 'item1' }]);

    const lastReq = requests[requests.length - 1];
    assert.equal(lastReq.url, '/v1/items');
    assert.equal(lastReq.headers['x-json-api'], 'test');
  }

  // 7. got.extend throws TypeError when options argument is not an object
  {
    assert.throws(
      () => got.extend('invalid-option-string'),
      TypeError
    );
    assert.throws(
      () => got.extend(123),
      TypeError
    );
  }
} finally {
  server.close();
}

console.log('Contract tests passed successfully.');

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