CodeSampleX

Sample

make-fetch-happen 14.0.3: defaults

Verified sample for npm make-fetch-happen 14.0.3: defaults. The contract ran on node 22 · linux debian/x64 · docker and passed.

sha256:556bcd200ae1a9b74dd4191334ee97f75fb2803ebe5111f9280a4810312cb836

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 linux 24 · ubuntu · glibc 2.39 x64 npm

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…		 2026-10-17

Case

HOW
Goal
verify make-fetch-happen.defaults in pkg:npm/make-fetch-happen@14.0.3
Packages
Symbols
  • make-fetch-happen.defaults
Created
2026-10-17T23:02:23Z

Contract

  1. makeFetchHappen.defaults(defaultUrl, defaultOptions, wrappedFetch) returns a callable fetch function with its own .defaults method that falls back to defaultUrl when called with undefined URL and deep-merges defaultOptions.headers with per-call options.headers
  2. makeFetchHappen.defaults(defaultOptions, undefined, wrappedFetch) treats an object first argument as defaultOptions with defaultUrl set to null
  3. Calling .defaults(chainedUrl, chainedOptions) on a defaulted fetch function chains onto the parent defaulted fetch, merging options and headers across layers
  4. makeFetchHappen.defaults(defaultUrl, { cachePath, cache: 'only-if-cached', retry: false }) uses makeFetchHappen as the default wrappedFetch and rejects with error code ENOTCACHED when the entry is absent from cachePath

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 make-fetch-happen.defaults in pkg:npm/make-fetch-happen@14.0.3
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:npm/make-fetch-happen@14.0.3
Demonstrate these symbols/APIs:
  - make-fetch-happen.defaults

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:ffae1f0a9bc819157437b816178294822f0752c6d80bf7bdb28601f22c9c3723","contract":["makeFetchHappen.defaults(defaultUrl, defaultOptions, wrappedFetch) returns a callable fetch function with its own .defaults method that falls back to defaultUrl when called with undefined URL and deep-merges defaultOptions.headers with per-call options.headers","makeFetchHappen.defaults(defaultOptions, undefined, wrappedFetch) treats an object first argument as defaultOptions with defaultUrl set to null","Calling .defaults(chainedUrl, chainedOptions) on a defaulted fetch function chains onto the parent defaulted fetch, merging options and headers across layers","makeFetchHappen.defaults(defaultUrl, { cachePath, cache: 'only-if-cached', retry: false }) uses makeFetchHappen as the default wrappedFetch and rejects with error code ENOTCACHED when the entry is absent from cachePath"],"goal":"verify make-fetch-happen.defaults in pkg:npm/make-fetch-happen@14.0.3","kind":"HOW","packages":["pkg:npm/make-fetch-happen@14.0.3"],"schemaVersion":1,"symbols":["make-fetch-happen.defaults"]},"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/make-fetch-happen@14.0.3"],"schemaVersion":1,"subject":"pkg:npm/make-fetch-happen@14.0.3","symbols":["make-fetch-happen.defaults"],"verifierAdapter":"node-typescript@1"}
package-lock.json
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package.json
{
  "name": "sample-make-fetch-happen-defaults",
  "version": "1.0.0",
  "private": true,
  "type": "module",
  "scripts": {
    "test": "node test/contract.mjs"
  },
  "dependencies": {
    "make-fetch-happen": "14.0.3"
  }
}
spec.json
{
  "schemaVersion": 1,
  "goal": "verify make-fetch-happen.defaults in pkg:npm/make-fetch-happen@14.0.3",
  "kind": "HOW",
  "packages": [
    "pkg:npm/make-fetch-happen@14.0.3"
  ],
  "symbols": [
    "make-fetch-happen.defaults"
  ]
}
src/index.mjs
import makeFetchHappen from 'make-fetch-happen';

export function createUrlAndOptionsClient(defaultUrl, defaultOptions, customFetch) {
  return makeFetchHappen.defaults(defaultUrl, defaultOptions, customFetch);
}

export function createOptionsOnlyClient(defaultOptions, customFetch) {
  return makeFetchHappen.defaults(defaultOptions, undefined, customFetch);
}

export function createChainedClient(baseOptions, chainedUrl, chainedOptions, customFetch) {
  const baseClient = makeFetchHappen.defaults(baseOptions, undefined, customFetch);
  return baseClient.defaults(chainedUrl, chainedOptions);
}

export function createOfflineCacheClient(defaultUrl, cachePath) {
  return makeFetchHappen.defaults(defaultUrl, {
    cachePath,
    cache: 'only-if-cached',
    retry: false,
  });
}
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 makeFetchHappen from 'make-fetch-happen';
import {
  createUrlAndOptionsClient,
  createOptionsOnlyClient,
  createChainedClient,
  createOfflineCacheClient,
} from '../src/index.mjs';

assert.equal(typeof makeFetchHappen.defaults, 'function');

// 1. Default URL + default options + header deep-merging
{
  const calls = [];
  const recorder = async (url, options) => {
    calls.push({ url, options });
    return new makeFetchHappen.Response('ok', { status: 200 });
  };

  const client = createUrlAndOptionsClient(
    'https://example.com/v1/items',
    {
      method: 'POST',
      headers: {
        'x-base': 'alpha',
        'x-override': 'initial',
      },
    },
    recorder
  );

  assert.equal(typeof client, 'function');
  assert.equal(typeof client.defaults, 'function');

  const res1 = await client(undefined, {
    headers: {
      'x-override': 'updated',
      'x-request': 'req-1',
    },
  });
  assert.equal(res1.status, 200);
  assert.equal(calls.length, 1);
  assert.equal(calls[0].url, 'https://example.com/v1/items');
  assert.equal(calls[0].options.method, 'POST');
  assert.deepEqual(calls[0].options.headers, {
    'x-base': 'alpha',
    'x-override': 'updated',
    'x-request': 'req-1',
  });

  // Explicit URL overrides defaultUrl
  await client('https://example.com/v1/other');
  assert.equal(calls.length, 2);
  assert.equal(calls[1].url, 'https://example.com/v1/other');
}

// 2. Object-first overload: makeFetchHappen.defaults(defaultOptions) sets defaultUrl = null
{
  const calls = [];
  const recorder = async (url, options) => {
    calls.push({ url, options });
    return new makeFetchHappen.Response('ok', { status: 200 });
  };

  const client = createOptionsOnlyClient(
    {
      retry: 2,
      headers: { 'accept': 'application/json' },
    },
    recorder
  );

  await client('https://example.com/status', {
    headers: { 'x-extra': 'yes' },
  });
  assert.equal(calls.length, 1);
  assert.equal(calls[0].url, 'https://example.com/status');
  assert.equal(calls[0].options.retry, 2);
  assert.deepEqual(calls[0].options.headers, {
    'accept': 'application/json',
    'x-extra': 'yes',
  });
}

// 3. Chained .defaults() merges options and headers across layers
{
  const calls = [];
  const recorder = async (url, options) => {
    calls.push({ url, options });
    return new makeFetchHappen.Response('ok', { status: 200 });
  };

  const chained = createChainedClient(
    {
      retry: 1,
      headers: { 'x-layer-1': 'one', 'x-shared': 'from-layer-1' },
    },
    'https://example.com/chained',
    {
      headers: { 'x-layer-2': 'two', 'x-shared': 'from-layer-2' },
    },
    recorder
  );

  await chained(undefined, {
    headers: { 'x-call': 'three' },
  });

  assert.equal(calls.length, 1);
  assert.equal(calls[0].url, 'https://example.com/chained');
  assert.equal(calls[0].options.retry, 1);
  assert.deepEqual(calls[0].options.headers, {
    'x-layer-1': 'one',
    'x-layer-2': 'two',
    'x-shared': 'from-layer-2',
    'x-call': 'three',
  });
}

// 4. Real makeFetchHappen pipeline via makeFetchHappen.defaults with offline cache-only mode
{
  const tmpDir = await fs.mkdtemp(path.join(os.tmpdir(), 'mfh-cache-'));
  try {
    const offlineClient = createOfflineCacheClient(
      'https://example.com/cached-resource',
      tmpDir
    );
    await assert.rejects(
      () => offlineClient(),
      (err) => err && err.code === 'ENOTCACHED'
    );
  } finally {
    await fs.rm(tmpDir, { recursive: true, force: true });
  }
}

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