cacache 19.0.1: verify

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.verify 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.verify

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:sha256:98ac51842cbb979baba308cb6503d23d1f1360016e0b01e7b8def7cc4706bdcc","contract":["cacache.verify validates active cache entries, garbage-collects unreferenced content, and returns verification statistics","cacache.verify accepts a filter callback to selectively retain or exclude index entries during verification","cacache.verify.lastRun returns a valid Date timestamp recording when cache verification last completed"],"goal":"verify cacache.verify in pkg:npm/cacache@19.0.1","kind":"HOW","packages":["pkg:npm/cacache@19.0.1"],"schemaVersion":1,"symbols":["cacache.verify"]},"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.verify"],"verifierAdapter":"node-typescript@1"}

{
  "name": "cacache-verify-sample",
  "version": "1.0.0",
  "lockfileVersion": 3,
  "requires": true,
  "packages": {
    "": {
      "name": "cacache-verify-sample",
      "version": "1.0.0",
      "dependencies": {
        "cacache": "19.0.1"
      }
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}

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

import cacache from 'cacache';

export async function verifyCacheStore(cacheDir) {
  await cacache.put(cacheDir, 'entry-alpha', Buffer.from('alpha payload', 'utf8'));
  await cacache.put(cacheDir, 'entry-beta', Buffer.from('beta payload', 'utf8'));
  await cacache.rm.entry(cacheDir, 'entry-beta');

  const stats = await cacache.verify(cacheDir, {
    filter: (entry) => entry.key.startsWith('entry-')
  });
  const lastRun = await cacache.verify.lastRun(cacheDir);

  return {
    verifiedContent: stats.verifiedContent,
    keptSize: stats.keptSize,
    reclaimedCount: stats.reclaimedCount,
    totalEntries: stats.totalEntries,
    rejectedEntries: stats.rejectedEntries,
    lastRunTime: lastRun.getTime()
  };
}

import assert from 'node:assert/strict';
import { rm } from 'node:fs/promises';
import { verifyCacheStore } from '../src/index.mjs';

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

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

  assert.equal(result.verifiedContent, 1);
  assert.equal(result.keptSize, 13);
  assert.equal(result.reclaimedCount, 1);
  assert.equal(result.totalEntries, 1);
  assert.equal(result.rejectedEntries, 0);
  assert.equal(Number.isFinite(result.lastRunTime) && result.lastRunTime > 0, true);
} finally {
  await rm(cacheDir, { recursive: true, force: true });
}