CodeSampleX

Sample

cacache 19.0.1

Verified sample for npm cacache 19.0.1. The contract ran on node 22 · linux debian/x64 · docker and passed: cacache.put stores data under a key with metadata…

sha256:852474865e2c4e4fecf52647938d522366924d463e14122b7d11834c9c4f56dc

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 pkg:npm/cacache@19.0.1
Packages
Created
2026-10-17T12:06:49Z

Contract

  1. cacache.put stores data under a key with metadata and returns an sha512 integrity string
  2. cacache.get and cacache.get.byDigest read back the exact stored Buffer payload and metadata
  3. cacache.ls lists active index entries and cacache.verify checks content integrity and records lastRun
  4. cacache.rm.entry and cacache.rm.content remove the index entry and content blob from the cache

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 pkg:npm/cacache@19.0.1
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:npm/cacache@19.0.1

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:sha256:0013abca24b5c55a3ea87d128dcdab6c4fa7dc8e6a726f8aa5548a5d6c92ecd4","contract":["cacache.put stores data under a key with metadata and returns an sha512 integrity string","cacache.get and cacache.get.byDigest read back the exact stored Buffer payload and metadata","cacache.ls lists active index entries and cacache.verify checks content integrity and records lastRun","cacache.rm.entry and cacache.rm.content remove the index entry and content blob from the cache"],"goal":"verify pkg:npm/cacache@19.0.1","kind":"HOW","packages":["pkg:npm/cacache@19.0.1"],"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/cacache@19.0.1"],"schemaVersion":1,"subject":"pkg:npm/cacache@19.0.1","verifierAdapter":"node-typescript@1"}
package-lock.json
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}
package.json
{
  "name": "cacache-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 pkg:npm/cacache@19.0.1",
  "kind": "HOW",
  "packages": [
    "pkg:npm/cacache@19.0.1"
  ]
}
src/index.mjs
import cacache from 'cacache';

export async function runCacheLifecycle(cacheDir) {
  const key = 'greeting-entry';
  const payload = Buffer.from('hello content-addressable cache', 'utf8');
  const metadata = { contentType: 'text/plain', tag: 'v1' };

  const integrity = await cacache.put(cacheDir, key, payload, { metadata });

  const retrieved = await cacache.get(cacheDir, key);
  const byDigest = await cacache.get.byDigest(cacheDir, integrity);
  const info = await cacache.get.info(cacheDir, key);
  const listing = await cacache.ls(cacheDir);

  const verifyStats = await cacache.verify(cacheDir);
  const lastVerified = await cacache.verify.lastRun(cacheDir);

  await cacache.rm.entry(cacheDir, key);
  const infoAfterEntryRm = await cacache.get.info(cacheDir, key);

  await cacache.rm.content(cacheDir, integrity);
  const hasContentAfterRm = await cacache.get.hasContent(cacheDir, integrity);

  return {
    integrity: String(integrity),
    retrievedText: retrieved.data.toString('utf8'),
    retrievedSize: retrieved.size,
    retrievedMetadata: retrieved.metadata,
    byDigestText: byDigest.toString('utf8'),
    infoKey: info.key,
    listedKeys: Object.keys(listing),
    verifiedContent: verifyStats.verifiedContent,
    totalEntries: verifyStats.totalEntries,
    lastVerifiedIsDate: lastVerified instanceof Date && !Number.isNaN(lastVerified.getTime()),
    infoAfterEntryRm,
    hasContentAfterRm
  };
}
test/contract.mjs
import assert from 'node:assert/strict';
import { rm } from 'node:fs/promises';
import { runCacheLifecycle } from '../src/index.mjs';

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

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

  assert.equal( result.integrity.startsWith('sha512-'), true );
  assert.equal( result.retrievedText, 'hello content-addressable cache' );
  assert.equal( result.retrievedSize, 31 );
  assert.deepEqual( result.retrievedMetadata, { contentType: 'text/plain', tag: 'v1' } );
  assert.equal( result.byDigestText, 'hello content-addressable cache' );
  assert.equal( result.infoKey, 'greeting-entry' );
  assert.deepEqual( result.listedKeys, ['greeting-entry'] );
  assert.equal( result.verifiedContent, 1 );
  assert.equal( result.totalEntries, 1 );
  assert.equal( result.lastVerifiedIsDate, true );
  assert.equal( result.infoAfterEntryRm, null );
  assert.equal( result.hasContentAfterRm, false );
} finally {
  await rm(cacheDir, { recursive: true, force: true });
}

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