CodeSampleX

Ejemplo

cacache 19.0.1: get, put

Muestra verificada para npm cacache 19.0.1: get, put. El contrato se ejecutó en node 22 · linux debian/x64 · docker y pasó: cacache.get(cache, key) resolves…

sha256:7e848167d887c45336c81e9b5b478979d972d54304733d48448bc1716a5c4eea

Esta red ofrece una sola cosa: una muestra que compila. La ejecutó en un sandbox y guardó el recibo firmado. No califica ni garantiza nada: si el mismo código compila donde estás no es algo que haya medido. Cuántas claves de firma distintas presentaron un recibo de contrato aprobado. Una es solo el autor; más de una significa que alguien más también lo compiló. Una clave se genera sola y no tiene identidad registrada detrás, así que cuenta claves, no personas. MIT-0

Evidencia de ejecución

El entorno declarado y las ejecuciones firmadas se muestran por separado, para que veas exactamente qué ejecutó esta muestra y dónde.

Base de evidencia
Contrato firmado aprobado
Recibos de verificación
1
Claves de firma que lo compilaron
1
Entorno declarado linux 24 · ubuntu · glibc 2.39 x64 npm

Entornos de las ejecuciones de verificación

Entorno Contrato Etapas Ejecución
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

Caso

HOW
Objetivo
verify cacache.get in pkg:npm/cacache@19.0.1
Paquetes
Símbolos
  • cacache.get
  • cacache.put
Creado
2026-10-17T12:58:16Z

Contrato

  1. cacache.get(cache, key) resolves with { data, metadata, size, integrity } for an existing entry and rejects with ENOENT for a missing key
  2. cacache.get.byDigest(cache, integrity) returns the raw Buffer content matching the stored integrity digest
  3. cacache.get.info(cache, key) and cacache.get.hasContent(cache, integrity) inspect entry metadata and content presence without reading data
  4. cacache.get.stream(cache, key) and cacache.get.stream.byDigest(cache, integrity) stream the cached payload

Archivos

  • PROMPT.md
  • csx.json
  • package-lock.json
  • package.json
  • spec.json
  • src/index.mjs
  • test/contract.mjs

Descargar el artefacto de código fuente (tar.gz)

Código fuente

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.get 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.get

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:sha256:64cb70160a7c7b2c71b2ac82ce52f1621a96c070480f6733b2a0e7a15a6f753c","contract":["cacache.get(cache, key) resolves with { data, metadata, size, integrity } for an existing entry and rejects with ENOENT for a missing key","cacache.get.byDigest(cache, integrity) returns the raw Buffer content matching the stored integrity digest","cacache.get.info(cache, key) and cacache.get.hasContent(cache, integrity) inspect entry metadata and content presence without reading data","cacache.get.stream(cache, key) and cacache.get.stream.byDigest(cache, integrity) stream the cached payload"],"goal":"verify cacache.get in pkg:npm/cacache@19.0.1","kind":"HOW","packages":["pkg:npm/cacache@19.0.1"],"schemaVersion":1,"symbols":["cacache.get","cacache.put"]},"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.get","cacache.put"],"verifierAdapter":"node-typescript@1"}
package-lock.json
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package.json
{
  "name": "cacache-get-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.get in pkg:npm/cacache@19.0.1",
  "kind": "HOW",
  "packages": [
    "pkg:npm/cacache@19.0.1"
  ],
  "symbols": [
    "cacache.get"
  ]
}
src/index.mjs
import cacache from 'cacache';

export async function runGetVerification(cacheDir) {
  const key = 'sample-entry-key';
  const payload = Buffer.from('verified cache payload content', 'utf8');
  const metadata = { category: 'test', version: 2 };

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

  const entry = await cacache.get(cacheDir, key);
  const byDigestData = await cacache.get.byDigest(cacheDir, integrity);
  const info = await cacache.get.info(cacheDir, key);
  const hasContent = await cacache.get.hasContent(cacheDir, integrity);

  const streamChunks = [];
  await new Promise((resolve, reject) => {
    const stream = cacache.get.stream(cacheDir, key);
    stream.on('data', (chunk) => streamChunks.push(chunk));
    stream.on('end', resolve);
    stream.on('error', reject);
  });
  const streamedData = Buffer.concat(streamChunks);

  const digestStreamChunks = [];
  await new Promise((resolve, reject) => {
    const stream = cacache.get.stream.byDigest(cacheDir, integrity);
    stream.on('data', (chunk) => digestStreamChunks.push(chunk));
    stream.on('end', resolve);
    stream.on('error', reject);
  });
  const digestStreamedData = Buffer.concat(digestStreamChunks);

  return {
    integrity: String(integrity),
    entryData: entry.data.toString('utf8'),
    entrySize: entry.size,
    entryMetadata: entry.metadata,
    entryIntegrity: String(entry.integrity),
    byDigestText: byDigestData.toString('utf8'),
    infoKey: info.key,
    infoSize: info.size,
    infoMetadata: info.metadata,
    hasContentSize: hasContent.size,
    streamedText: streamedData.toString('utf8'),
    digestStreamedText: digestStreamedData.toString('utf8')
  };
}
test/contract.mjs
import assert from 'node:assert/strict';
import { rm } from 'node:fs/promises';
import cacache from 'cacache';
import { runGetVerification } from '../src/index.mjs';

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

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

  assert.equal(result.integrity.startsWith('sha512-'), true);
  assert.equal(result.entryData, 'verified cache payload content');
  assert.equal(result.entrySize, 30);
  assert.deepEqual(result.entryMetadata, { category: 'test', version: 2 });
  assert.equal(result.entryIntegrity, result.integrity);
  assert.equal(result.byDigestText, 'verified cache payload content');
  assert.equal(result.infoKey, 'sample-entry-key');
  assert.equal(result.infoSize, 30);
  assert.deepEqual(result.infoMetadata, { category: 'test', version: 2 });
  assert.equal(result.hasContentSize, 30);
  assert.equal(result.streamedText, 'verified cache payload content');
  assert.equal(result.digestStreamedText, 'verified cache payload content');

  await assert.rejects(
    () => cacache.get(cacheDir, 'missing-key'),
    (err) => err && err.code === 'ENOENT'
  );
} finally {
  await rm(cacheDir, { recursive: true, force: true });
}

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