CodeSampleX

Sample

jest-watcher 29.7.0: JestHook

Verified sample for npm jest-watcher 29.7.0: JestHook. The contract ran on node 22 · linux debian/x64 · docker and passed: JestHook initializes with unused…

sha256:4735a1565c33d30d4772ed37bb3debcedb5eef627715cbf0f4be68fa31b11375

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 node 22.23 linux 24 · ubuntu · glibc 2.39 x64 node 22.23 javascript npm 10

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…		 2026-09-05

Case

HOW
Goal
verify jest-watcher.JestHook in pkg:npm/jest-watcher@29.7.0
Packages
Symbols
  • jest-watcher.JestHook
Environment
node 22.23.2
Created
2026-09-05T18:22:03Z

Contract

  1. JestHook initializes with unused hook states for onFileChange, onTestRunComplete, and shouldRunTestSuite
  2. JestHook getSubscriber registers onFileChange listeners and getEmitter synchronously dispatches filesystem state
  3. JestHook getSubscriber registers onTestRunComplete listeners and getEmitter synchronously dispatches test results
  4. JestHook emitter shouldRunTestSuite resolves true when no predicates are registered or when all predicates return truthy
  5. JestHook emitter shouldRunTestSuite resolves false when any synchronous or asynchronous predicate returns false
  6. JestHook isUsed dynamically reflects listener registration status across known and unknown hooks

Files

  • PROMPT.md
  • csx.json
  • index.js
  • package-lock.json
  • package.json
  • spec.json
  • 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 jest-watcher.JestHook in pkg:npm/jest-watcher@29.7.0
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:npm/jest-watcher@29.7.0
Demonstrate these symbols/APIs:
  - jest-watcher.JestHook
Constraints:
  - executionContext: node
Required runtime conditions:
  - ecosystem: npm
  - language: javascript
  - moduleSystem: cjs
  - packageManager: npm@10.9.8
  - runtime: node@22.23.2

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:sha256:155c076c3f08a1bea0324bd8329e1918bd7ca80a94728785746bd4cb5083a8ea","constraints":{"executionContext":"node"},"contract":["JestHook initializes with unused hook states for onFileChange, onTestRunComplete, and shouldRunTestSuite","JestHook getSubscriber registers onFileChange listeners and getEmitter synchronously dispatches filesystem state","JestHook getSubscriber registers onTestRunComplete listeners and getEmitter synchronously dispatches test results","JestHook emitter shouldRunTestSuite resolves true when no predicates are registered or when all predicates return truthy","JestHook emitter shouldRunTestSuite resolves false when any synchronous or asynchronous predicate returns false","JestHook isUsed dynamically reflects listener registration status across known and unknown hooks"],"goal":"verify jest-watcher.JestHook in pkg:npm/jest-watcher@29.7.0","kind":"HOW","packages":["pkg:npm/jest-watcher@29.7.0"],"schemaVersion":1,"symbols":["jest-watcher.JestHook"]},"contractCommand":["node","test/contract.mjs"],"environment":{"arch":"x64","distro":"ubuntu","ecosystem":"npm","executionContext":"node","language":"javascript","libc":"glibc","libcVersion":"2.39","moduleSystem":"esm","os":"linux","osVersionBucket":"24","packageManager":"npm","packageManagerVersion":"10.9.8","runtime":"node","runtimeVersion":"22.23.2","schemaVersion":1},"license":"MIT-0","packages":["pkg:npm/jest-watcher@29.7.0"],"schemaVersion":1,"subject":"pkg:npm/jest-watcher@29.7.0","symbols":["jest-watcher.JestHook"],"verifierAdapter":"node-typescript@1"}
index.js
import { JestHook } from 'jest-watcher';

export function createJestHook() {
  return new JestHook();
}

export { JestHook };
package-lock.json
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package.json
{
  "name": "sample-jest-watcher-jest-hook",
  "version": "1.0.0",
  "description": "Minimal clean-room sample verifying jest-watcher.JestHook in jest-watcher",
  "main": "index.js",
  "type": "module",
  "license": "MIT-0",
  "dependencies": {
    "jest-watcher": "29.7.0"
  }
}
spec.json
{
  "schemaVersion": 1,
  "goal": "verify jest-watcher.JestHook in pkg:npm/jest-watcher@29.7.0",
  "kind": "HOW",
  "packages": [
    "pkg:npm/jest-watcher@29.7.0"
  ],
  "symbols": [
    "jest-watcher.JestHook"
  ],
  "constraints": {
    "executionContext": "node"
  },
  "runtimeConditions": {
    "ecosystem": "npm",
    "language": "javascript",
    "moduleSystem": "cjs",
    "packageManager": "npm@10.9.8",
    "runtime": "node@22.23.2"
  }
}
test/contract.mjs
import assert from 'node:assert/strict';
import { JestHook } from 'jest-watcher';
import { createJestHook } from '../index.js';

async function run() {
  // 1. JestHook initializes with unused hook states for onFileChange, onTestRunComplete, and shouldRunTestSuite
  const hook = createJestHook();
  assert.equal(hook.isUsed('onFileChange'), false);
  assert.equal(hook.isUsed('onTestRunComplete'), false);
  assert.equal(hook.isUsed('shouldRunTestSuite'), false);
  assert.equal(hook.isUsed('unknownHook'), false);

  const subscriber = hook.getSubscriber();
  const emitter = hook.getEmitter();

  assert.equal(typeof subscriber.onFileChange, 'function');
  assert.equal(typeof subscriber.onTestRunComplete, 'function');
  assert.equal(typeof subscriber.shouldRunTestSuite, 'function');
  assert.equal(typeof emitter.onFileChange, 'function');
  assert.equal(typeof emitter.onTestRunComplete, 'function');
  assert.equal(typeof emitter.shouldRunTestSuite, 'function');

  // 2. JestHook getSubscriber registers onFileChange listeners and getEmitter synchronously dispatches filesystem state
  const receivedFsEvents = [];
  subscriber.onFileChange((fs) => {
    receivedFsEvents.push({ listener: 1, fs });
  });
  subscriber.onFileChange((fs) => {
    receivedFsEvents.push({ listener: 2, fs });
  });

  const mockFs = {
    projects: [
      {
        config: { rootDir: '/workspace' },
        testPaths: ['/workspace/tests/a.spec.js', '/workspace/tests/b.spec.js'],
      },
    ],
  };

  emitter.onFileChange(mockFs);
  assert.equal(receivedFsEvents.length, 2);
  assert.deepEqual(receivedFsEvents[0], { listener: 1, fs: mockFs });
  assert.deepEqual(receivedFsEvents[1], { listener: 2, fs: mockFs });

  // 3. JestHook getSubscriber registers onTestRunComplete listeners and getEmitter synchronously dispatches test results
  const receivedResults = [];
  subscriber.onTestRunComplete((results) => {
    receivedResults.push(results);
  });

  const mockResults = {
    numFailedTestSuites: 0,
    numFailedTests: 0,
    numPassedTestSuites: 2,
    numPassedTests: 8,
    numTotalTestSuites: 2,
    numTotalTests: 8,
    success: true,
    startTime: 1700000000000,
    wasInterrupted: false,
  };

  emitter.onTestRunComplete(mockResults);
  assert.equal(receivedResults.length, 1);
  assert.deepEqual(receivedResults[0], mockResults);

  // 4. JestHook emitter shouldRunTestSuite resolves true when no predicates are registered or when all predicates return truthy
  const freshHook = new JestHook();
  const freshEmitter = freshHook.getEmitter();
  const testSuite = { testPath: '/workspace/tests/example.test.js', config: {} };
  const initialDecision = await freshEmitter.shouldRunTestSuite(testSuite);
  assert.equal(initialDecision, true);

  const filteringHook = new JestHook();
  const filterSub = filteringHook.getSubscriber();
  const filterEmitter = filteringHook.getEmitter();

  filterSub.shouldRunTestSuite((suite) => suite.testPath.endsWith('.test.js'));
  filterSub.shouldRunTestSuite(async (suite) => !suite.testPath.includes('disabled'));

  const allowedDecision = await filterEmitter.shouldRunTestSuite(testSuite);
  assert.equal(allowedDecision, true);

  // 5. JestHook emitter shouldRunTestSuite resolves false when any synchronous or asynchronous predicate returns false
  const rejectedBySyncSuite = { testPath: '/workspace/tests/example.spec.js', config: {} };
  const syncDecision = await filterEmitter.shouldRunTestSuite(rejectedBySyncSuite);
  assert.equal(syncDecision, false);

  const rejectedByAsyncSuite = { testPath: '/workspace/tests/disabled.test.js', config: {} };
  const asyncDecision = await filterEmitter.shouldRunTestSuite(rejectedByAsyncSuite);
  assert.equal(asyncDecision, false);

  // 6. JestHook isUsed dynamically reflects listener registration status across known and unknown hooks
  assert.equal(hook.isUsed('onFileChange'), true);
  assert.equal(hook.isUsed('onTestRunComplete'), true);
  assert.equal(hook.isUsed('shouldRunTestSuite'), false);
  assert.equal(hook.isUsed('unknownHook'), false);

  assert.equal(filteringHook.isUsed('shouldRunTestSuite'), true);
  assert.equal(filteringHook.isUsed('onFileChange'), false);

  console.log('JestHook contract tests completed successfully.');
}

run();

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