CodeSampleX

Sample

cacache 19.0.1: put, get

Verified sample for npm cacache 19.0.1: put, get. The contract ran on node 22 · linux debian/x64 · docker and passed: cacache.put(cache, key, data, opts)…

sha256:7b16d039c66bdcce5109d3a30b0abed63880d4e742c7e77cbf2b243e1de8ec4b

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 cacache.put in pkg:npm/cacache@19.0.1
Packages
Symbols
  • cacache.put
  • cacache.get
Created
2026-10-17T13:11:22Z

Contract

  1. cacache.put(cache, key, data, opts) stores content and index metadata with custom algorithms and memoize options, returning the computed integrity digest
  2. cacache.put rejects with EBADSIZE when opts.size does not match data.length and with EINTEGRITY when opts.integrity fails verification
  3. cacache.put.stream(cache, key, opts) returns a writable pipeline that writes streamed content to the cache and emits integrity and size events

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 cacache.put in pkg:npm/cacache@19.0.1
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:npm/cacache@19.0.1
Demonstrate these symbols/APIs:
  - cacache.put

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:sha256:6f89c8d32428369b3f29a01b44c2b5379d9d52e8385f592b65143849d378a0e5","contract":["cacache.put(cache, key, data, opts) stores content and index metadata with custom algorithms and memoize options, returning the computed integrity digest","cacache.put rejects with EBADSIZE when opts.size does not match data.length and with EINTEGRITY when opts.integrity fails verification","cacache.put.stream(cache, key, opts) returns a writable pipeline that writes streamed content to the cache and emits integrity and size events"],"goal":"verify cacache.put in pkg:npm/cacache@19.0.1","kind":"HOW","packages":["pkg:npm/cacache@19.0.1"],"schemaVersion":1,"symbols":["cacache.put","cacache.get"]},"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/cacache@19.0.1"],"schemaVersion":1,"subject":"pkg:npm/cacache@19.0.1","symbols":["cacache.put","cacache.get"],"verifierAdapter":"node-typescript@1"}
package-lock.json
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package.json
{
  "name": "cacache-put-sample",
  "version": "1.0.0",
  "private": true,
  "type": "module",
  "scripts": {
    "test": "node test/contract.mjs"
  },
  "dependencies": {
    "cacache": "19.0.1"
  }
}
spec.json
{
  "schemaVersion": 1,
  "goal": "verify cacache.put in pkg:npm/cacache@19.0.1",
  "kind": "HOW",
  "packages": [
    "pkg:npm/cacache@19.0.1"
  ],
  "symbols": [
    "cacache.put"
  ]
}
src/index.mjs
import cacache from 'cacache';

export async function runPutVerification(cacheDir) {
  const key = 'put-buffer-entry';
  const payload = Buffer.from('content stored via cacache.put', 'utf8');
  const metadata = { origin: 'unit', revision: 1 };
  const memoStore = new Map();

  const integrity = await cacache.put(cacheDir, key, payload, {
    metadata,
    algorithms: ['sha256'],
    size: payload.length,
    memoize: memoStore
  });

  const stored = await cacache.get(cacheDir, key);

  const streamKey = 'put-stream-entry';
  const streamPayload = Buffer.from('streamed content via cacache.put.stream', 'utf8');
  const streamMeta = { mode: 'stream' };

  let emittedIntegrity;
  let emittedSize;

  await new Promise((resolve, reject) => {
    const writable = cacache.put.stream(cacheDir, streamKey, { metadata: streamMeta });
    writable.on('integrity', (int) => {
      emittedIntegrity = String(int);
    });
    writable.on('size', (s) => {
      emittedSize = s;
    });
    writable.on('error', reject);
    writable.on('finish', resolve);
    writable.end(streamPayload);
  });

  const streamStored = await cacache.get(cacheDir, streamKey);

  return {
    integrity: String(integrity),
    storedText: stored.data.toString('utf8'),
    storedSize: stored.size,
    storedMetadata: stored.metadata,
    memoHasKey: memoStore.has(`key:${cacheDir}:${key}`),
    memoHasDigest: memoStore.has(`digest:${cacheDir}:${integrity}`),
    emittedIntegrity,
    emittedSize,
    streamStoredText: streamStored.data.toString('utf8'),
    streamStoredMetadata: streamStored.metadata
  };
}
test/contract.mjs
import assert from 'node:assert/strict';
import { rm } from 'node:fs/promises';
import cacache from 'cacache';
import { runPutVerification } from '../src/index.mjs';

const cacheDir = './.cache-put-test';

await rm(cacheDir, { recursive: true, force: true });
try {
  const result = await runPutVerification(cacheDir);

  assert.equal(result.integrity.startsWith('sha256-'), true);
  assert.equal(result.storedText, 'content stored via cacache.put');
  assert.equal(result.storedSize, 30);
  assert.deepEqual(result.storedMetadata, { origin: 'unit', revision: 1 });
  assert.equal(result.memoHasKey, true);
  assert.equal(result.memoHasDigest, true);

  assert.equal(result.emittedIntegrity.startsWith('sha512-'), true);
  assert.equal(result.emittedSize, 39);
  assert.equal(result.streamStoredText, 'streamed content via cacache.put.stream');
  assert.deepEqual(result.streamStoredMetadata, { mode: 'stream' });

  await assert.rejects(
    () => cacache.put(cacheDir, 'bad-size-key', Buffer.from('abc'), { size: 10 }),
    (err) => err && err.code === 'EBADSIZE'
  );

  await assert.rejects(
    () => cacache.put(cacheDir, 'bad-integrity-key', Buffer.from('abc'), {
      integrity: 'sha512-AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA=='
    }),
    (err) => err && err.code === 'EINTEGRITY'
  );
} finally {
  await rm(cacheDir, { recursive: true, force: true });
}

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anonymous