cacache 19.0.1: put, get

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.

{"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"}

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}

{
  "name": "cacache-put-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.put in pkg:npm/cacache@19.0.1",
  "kind": "HOW",
  "packages": [
    "pkg:npm/cacache@19.0.1"
  ],
  "symbols": [
    "cacache.put"
  ]
}

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
  };
}

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 });
}