cacache 19.0.1: get, put

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.

{"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"}

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  "version": "1.0.0",
  "lockfileVersion": 3,
  "requires": true,
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}

{
  "name": "cacache-get-sample",
  "version": "1.0.0",
  "private": true,
  "type": "module",
  "scripts": {
    "test": "node test/contract.mjs"
  },
  "dependencies": {
    "cacache": "19.0.1"
  }
}

{
  "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"
  ]
}

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')
  };
}

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 });
}